916 lines
27 KiB
C++
916 lines
27 KiB
C++
#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <cerrno>
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#include <cstring>
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#include <cstdlib>
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#include <cstdio>
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#include <unistd.h>
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#include <iostream>
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#include "defines.h"
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#include "shared_memory.h"
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#include "stream.h"
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namespace IPC {
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/// Stores a long value of val in network order to the pointer p.
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static void htobl(char * p, long val) {
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p[0] = (val >> 24) & 0xFF;
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p[1] = (val >> 16) & 0xFF;
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p[2] = (val >> 8) & 0xFF;
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p[3] = val & 0xFF;
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}
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/// Stores a long long value of val in network order to the pointer p.
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static void htobll(char * p, long long val) {
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p[0] = (val >> 56) & 0xFF;
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p[1] = (val >> 48) & 0xFF;
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p[2] = (val >> 40) & 0xFF;
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p[3] = (val >> 32) & 0xFF;
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p[4] = (val >> 24) & 0xFF;
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p[5] = (val >> 16) & 0xFF;
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p[6] = (val >> 8) & 0xFF;
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p[7] = val & 0xFF;
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}
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/// Reads a long value of p in host order to val.
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static void btohl(char * p, long & val) {
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val = ((long)p[0] << 24) | ((long)p[1] << 16) | ((long)p[2] << 8) | p[3];
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}
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/// Reads a long long value of p in host order to val.
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static void btohll(char * p, long long & val) {
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val = ((long long)p[0] << 56) | ((long long)p[1] << 48) | ((long long)p[2] << 40) | ((long long)p[3] << 32) | ((long long)p[4] << 24) | ((long long)p[5] << 16) | ((long long)p[6] << 8) | p[7];
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}
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///\brief Empty semaphore constructor, clears all values
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semaphore::semaphore() {
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#ifdef __CYGWIN__
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mySem = 0;
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#else
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mySem = SEM_FAILED;
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#endif
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myName = 0;
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}
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///\brief Constructs a named semaphore
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///\param name The name of the semaphore
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///\param oflag The flags with which to open the semaphore
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///\param mode The mode in which to create the semaphore, if O_CREAT is given in oflag, ignored otherwise
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///\param value The initial value of the semaphore if O_CREAT is given in oflag, ignored otherwise
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semaphore::semaphore(const char * name, int oflag, mode_t mode, unsigned int value) {
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#ifdef __CYGWIN__
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mySem = 0;
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#else
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mySem = SEM_FAILED;
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#endif
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open(name, oflag, mode, value);
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}
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///\brief The deconstructor
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semaphore::~semaphore() {}
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///\brief Returns whether we have a valid semaphore
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semaphore::operator bool() const {
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#ifdef __CYGWIN__
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return mySem != 0;
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#else
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return mySem != SEM_FAILED;
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#endif
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}
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///\brief Opens a semaphore
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///
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///Closes currently opened semaphore if needed
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///\param name The name of the semaphore
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///\param oflag The flags with which to open the semaphore
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///\param mode The mode in which to create the semaphore, if O_CREAT is given in oflag, ignored otherwise
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///\param value The initial value of the semaphore if O_CREAT is given in oflag, ignored otherwise
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void semaphore::open(const char * name, int oflag, mode_t mode, unsigned int value) {
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close();
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#ifdef __CYGWIN__
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mySem = CreateSemaphore(0, value, 1 , std::string("Global\\" + std::string(name)).c_str());
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#else
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if (oflag & O_CREAT) {
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mySem = sem_open(name, oflag, mode, value);
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} else {
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mySem = sem_open(name, oflag);
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}
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#endif
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myName = (char *)name;
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}
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///\brief Returns the current value of the semaphore
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int semaphore::getVal() const {
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#ifdef __CYGWIN__
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LONG res;
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ReleaseSemaphore(mySem, 0, &res);//not really release.... just checking to see if I can get the value this way
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#else
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int res;
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sem_getvalue(mySem, &res);
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#endif
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return res;
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}
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///\brief Posts to the semaphore, increases its value by one
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void semaphore::post() {
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if (*this) {
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#ifdef __CYGWIN__
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ReleaseSemaphore(mySem, 1, 0);
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#else
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sem_post(mySem);
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#endif
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}
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}
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///\brief Waits for the semaphore, decreases its value by one
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void semaphore::wait() {
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if (*this) {
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#ifdef __CYGWIN__
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WaitForSingleObject(mySem, INFINITE);
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#else
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int tmp;
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do {
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tmp = sem_wait(mySem);
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} while (tmp == -1 && errno == EINTR);
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#endif
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}
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}
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///\brief Tries to wait for the semaphore, returns true if successfull, false otherwise
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bool semaphore::tryWait() {
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bool result;
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#ifdef __CYGWIN__
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result = WaitForSingleObject(mySem, 0);//wait at most 1ms
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#else
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result = sem_trywait(mySem);
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#endif
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return (result == 0);
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}
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///\brief Closes the currently opened semaphore
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void semaphore::close() {
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if (*this) {
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#ifdef __CYGWIN__
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CloseHandle(mySem);
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mySem = 0;
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#else
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sem_close(mySem);
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mySem = SEM_FAILED;
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#endif
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}
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}
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///\brief Unlinks the previously opened semaphore
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void semaphore::unlink() {
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close();
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#ifndef __CYGWIN__
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if (myName) {
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sem_unlink(myName);
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}
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#endif
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myName = 0;
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}
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#if !defined __APPLE__
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///\brief Unmaps a shared page if allowed
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void sharedPage::unmap() {
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if (mapped && len) {
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#ifdef __CYGWIN__
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UnmapViewOfFile(mapped);
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#else
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munmap(mapped, len);
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#endif
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mapped = 0;
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len = 0;
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}
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}
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///\brief Closes a shared page if allowed
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void sharedPage::close() {
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unmap();
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if (handle > 0) {
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#ifdef __CYGWIN__
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CloseHandle(handle);
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#else
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::close(handle);
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if (master && name != "") {
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shm_unlink(name.c_str());
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}
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#endif
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handle = 0;
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}
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}
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///brief Creates a shared page
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///\param name_ The name of the page to be created
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///\param len_ The size to make the page
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///\param master_ Whether to create or merely open the page
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///\param autoBackoff When only opening the page, wait for it to appear or fail
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sharedPage::sharedPage(std::string name_, unsigned int len_, bool master_, bool autoBackoff) : handle(0), len(0), master(false), mapped(0) {
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init(name_, len_, master_, autoBackoff);
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}
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///\brief Creates a copy of a shared page
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///\param rhs The page to copy
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sharedPage::sharedPage(const sharedPage & rhs) {
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handle = 0;
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len = 0;
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master = false;
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mapped = 0;
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init(rhs.name, rhs.len, rhs.master);
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}
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///\brief Returns whether the shared page is valid or not
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sharedPage::operator bool() const {
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return mapped != 0;
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}
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///\brief Assignment operator
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void sharedPage::operator =(sharedPage & rhs) {
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init(rhs.name, rhs.len, rhs.master);
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rhs.master = false;//Make sure the memory does not get unlinked
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}
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///\brief Initialize a page, de-initialize before if needed
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///\param name_ The name of the page to be created
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///\param len_ The size to make the page
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///\param master_ Whether to create or merely open the page
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///\param autoBackoff When only opening the page, wait for it to appear or fail
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void sharedPage::init(std::string name_, unsigned int len_, bool master_, bool autoBackoff) {
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close();
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name = name_;
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len = len_;
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master = master_;
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mapped = 0;
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if (name.size()) {
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#ifdef __CYGWIN__
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if (master){
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handle = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, len, name.c_str());
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}else{
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int i = 0;
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do {
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if (i != 0){
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Util::sleep(1000);
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}
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handle = OpenFileMapping(FILE_MAP_ALL_ACCESS, FALSE, name.c_str());
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i++;
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} while(i < 10 && !handle && autoBackoff);
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}
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if (!handle) {
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DEBUG_MSG(DLVL_FAIL, "%s for page %s failed: %s", (master ? "CreateFileMapping" : "OpenFileMapping"), name.c_str(), strerror(errno));
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return;
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}
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mapped = (char *)MapViewOfFile(handle, FILE_MAP_ALL_ACCESS, 0, 0, 0);
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if (!mapped) {
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return;
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}
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#else
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handle = shm_open(name.c_str(), (master ? O_CREAT | O_EXCL : 0) | O_RDWR, ACCESSPERMS);
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if (handle == -1) {
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if (master) {
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DEBUG_MSG(DLVL_HIGH, "Overwriting old page for %s", name.c_str());
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handle = shm_open(name.c_str(), O_CREAT | O_RDWR, ACCESSPERMS);
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} else {
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int i = 0;
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while (i < 10 && handle == -1 && autoBackoff) {
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i++;
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Util::sleep(1000);
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handle = shm_open(name.c_str(), O_RDWR, ACCESSPERMS);
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}
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}
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}
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if (handle == -1) {
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DEBUG_MSG(DLVL_FAIL, "shm_open for page %s failed: %s", name.c_str(), strerror(errno));
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return;
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}
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if (master) {
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if (ftruncate(handle, 0) < 0) {
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DEBUG_MSG(DLVL_FAIL, "truncate to zero for page %s failed: %s", name.c_str(), strerror(errno));
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return;
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}
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if (ftruncate(handle, len) < 0) {
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DEBUG_MSG(DLVL_FAIL, "truncate to %lld for page %s failed: %s", len, name.c_str(), strerror(errno));
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return;
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}
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} else {
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struct stat buffStats;
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int xRes = fstat(handle, &buffStats);
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if (xRes < 0) {
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return;
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}
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len = buffStats.st_size;
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}
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mapped = (char *)mmap(0, len, PROT_READ | PROT_WRITE, MAP_SHARED, handle, 0);
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if (mapped == MAP_FAILED) {
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mapped = 0;
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return;
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}
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#endif
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}
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}
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///\brief Default destructor
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sharedPage::~sharedPage() {
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close();
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}
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#else
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///brief Creates a shared page
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///\param name_ The name of the page to be created
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///\param len_ The size to make the page
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///\param master_ Whether to create or merely open the page
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///\param autoBackoff When only opening the page, wait for it to appear or fail
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sharedPage::sharedPage(std::string name_, unsigned int len_, bool master_, bool autoBackoff) {
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handle = 0;
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len = 0;
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master = false;
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mapped = 0;
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init(name_, len_, master_, autoBackoff);
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}
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///\brief Creates a copy of a shared page
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///\param rhs The page to copy
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sharedPage::sharedPage(const sharedPage & rhs) {
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handle = 0;
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len = 0;
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master = false;
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mapped = 0;
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init(rhs.name, rhs.len, rhs.master);
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}
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///\brief Default destructor
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sharedPage::~sharedPage() {
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unmap();
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close(handle);
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if (master && name != "") {
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unlink(name.c_str());
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}
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}
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#endif
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///brief Creates a shared file
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///\param name_ The name of the file to be created
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///\param len_ The size to make the file
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///\param master_ Whether to create or merely open the file
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///\param autoBackoff When only opening the file, wait for it to appear or fail
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sharedFile::sharedFile(std::string name_, unsigned int len_, bool master_, bool autoBackoff) : handle(0), name(name_), len(len_), master(master_), mapped(NULL) {
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handle = 0;
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name = name_;
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len = len_;
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master = master_;
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mapped = 0;
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init(name_, len_, master_, autoBackoff);
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}
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///\brief Creates a copy of a shared page
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///\param rhs The page to copy
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sharedFile::sharedFile(const sharedFile & rhs) {
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handle = 0;
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name = "";
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len = 0;
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master = false;
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mapped = 0;
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init(rhs.name, rhs.len, rhs.master);
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}
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///\brief Returns whether the shared file is valid or not
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sharedFile::operator bool() const {
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return mapped != 0;
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}
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///\brief Assignment operator
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void sharedFile::operator =(sharedFile & rhs) {
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init(rhs.name, rhs.len, rhs.master);
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rhs.master = false;//Make sure the memory does not get unlinked
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}
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///\brief Unmaps a shared file if allowed
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void sharedFile::unmap() {
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if (mapped && len) {
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munmap(mapped, len);
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mapped = 0;
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len = 0;
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}
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}
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///\brief Initialize a page, de-initialize before if needed
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///\param name_ The name of the page to be created
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///\param len_ The size to make the page
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///\param master_ Whether to create or merely open the page
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///\param autoBackoff When only opening the page, wait for it to appear or fail
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void sharedFile::init(std::string name_, unsigned int len_, bool master_, bool autoBackoff) {
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unmap();
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if (master) {
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unlink(name.c_str());
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}
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if (handle > 0) {
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close(handle);
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}
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handle = 0;
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name = name_;
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len = len_;
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master = master_;
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mapped = 0;
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if (name.size()) {
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/// \todo Use ACCESSPERMS instead of 0600?
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handle = open(std::string(Util::getTmpFolder() + name).c_str(), (master ? O_CREAT | O_TRUNC | O_EXCL : 0) | O_RDWR, (mode_t)0600);
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if (handle == -1) {
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if (master) {
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DEBUG_MSG(DLVL_HIGH, "Overwriting old file for %s", name.c_str());
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handle = open(std::string(Util::getTmpFolder() + name).c_str(), O_CREAT | O_TRUNC | O_RDWR, (mode_t)0600);
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} else {
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int i = 0;
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while (i < 10 && handle == -1 && autoBackoff) {
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i++;
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Util::sleep(1000);
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handle = open(std::string(Util::getTmpFolder() + name).c_str(), O_RDWR, (mode_t)0600);
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}
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}
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}
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if (handle == -1) {
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perror(std::string("open for file " + name + " failed").c_str());
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return;
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}
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if (master) {
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if (ftruncate(handle, len) < 0) {
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perror(std::string("ftruncate to len for file " + name + " failed").c_str());
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return;
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}
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} else {
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struct stat buffStats;
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int xRes = fstat(handle, &buffStats);
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if (xRes < 0) {
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return;
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}
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len = buffStats.st_size;
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}
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mapped = (char *)mmap(0, len, PROT_READ | PROT_WRITE, MAP_SHARED, handle, 0);
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if (mapped == MAP_FAILED) {
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mapped = 0;
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return;
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}
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}
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}
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///\brief Default destructor
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sharedFile::~sharedFile() {
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unmap();
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if (master) {
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unlink(name.c_str());
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}
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if (handle > 0) {
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close(handle);
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}
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}
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///\brief StatExchange constructor, sets the datapointer to the given value
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statExchange::statExchange(char * _data) : data(_data) {}
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///\brief Sets timestamp of the current stats
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void statExchange::now(long long int time) {
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htobll(data, time);
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}
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///\brief Gets timestamp of the current stats
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long long int statExchange::now() {
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long long int result;
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btohll(data, result);
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return result;
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}
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///\brief Sets time currently connected
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void statExchange::time(long time) {
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htobl(data + 8, time);
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}
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///\brief Gets time currently connected
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long statExchange::time() {
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long result;
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btohl(data + 8, result);
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return result;
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}
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///\brief Sets the last viewing second of this user
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void statExchange::lastSecond(long time) {
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htobl(data + 12, time);
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}
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///\brief Gets the last viewing second of this user
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long statExchange::lastSecond() {
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long result;
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btohl(data + 12, result);
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return result;
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}
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///\brief Sets the amount of bytes received
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void statExchange::down(long long int bytes) {
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htobll(data + 16, bytes);
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}
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///\brief Gets the amount of bytes received
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long long int statExchange::down() {
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long long int result;
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btohll(data + 16, result);
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return result;
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}
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///\brief Sets the amount of bytes sent
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void statExchange::up(long long int bytes) {
|
|
htobll(data + 24, bytes);
|
|
}
|
|
|
|
///\brief Gets the amount of bytes sent
|
|
long long int statExchange::up() {
|
|
long long int result;
|
|
btohll(data + 24, result);
|
|
return result;
|
|
}
|
|
|
|
///\brief Sets the host of this connection
|
|
void statExchange::host(std::string name) {
|
|
memcpy(data + 32, name.c_str(), std::min((int)name.size(), 16));
|
|
}
|
|
|
|
///\brief Gets the host of this connection
|
|
std::string statExchange::host() {
|
|
return std::string(data + 32, std::min((int)strlen(data + 32), 16));
|
|
}
|
|
|
|
///\brief Sets the name of the stream this user is viewing
|
|
void statExchange::streamName(std::string name) {
|
|
memcpy(data + 48, name.c_str(), std::min((int)name.size(), 20));
|
|
}
|
|
|
|
///\brief Gets the name of the stream this user is viewing
|
|
std::string statExchange::streamName() {
|
|
return std::string(data + 48, std::min((int)strlen(data + 48), 20));
|
|
}
|
|
|
|
///\brief Sets the name of the connector through which this user is viewing
|
|
void statExchange::connector(std::string name) {
|
|
memcpy(data + 68, name.c_str(), std::min((int)name.size(), 20));
|
|
}
|
|
|
|
///\brief Gets the name of the connector through which this user is viewing
|
|
std::string statExchange::connector() {
|
|
return std::string(data + 68, std::min((int)strlen(data + 68), 20));
|
|
}
|
|
|
|
///\brief Creates a semaphore guard, locks the semaphore on call
|
|
semGuard::semGuard(semaphore thisSemaphore) : mySemaphore(thisSemaphore) {
|
|
mySemaphore.wait();
|
|
}
|
|
|
|
///\brief Destructs a semaphore guard, unlocks the semaphore on call
|
|
semGuard::~semGuard() {
|
|
mySemaphore.post();
|
|
}
|
|
|
|
///\brief Default constructor, erases all the values
|
|
sharedServer::sharedServer() {
|
|
payLen = 0;
|
|
hasCounter = false;
|
|
amount = 0;
|
|
}
|
|
|
|
///\brief Desired constructor, initializes after cleaning.
|
|
///\param name The basename of this server
|
|
///\param len The lenght of the payload
|
|
///\param withCounter Whether the content should have a counter
|
|
sharedServer::sharedServer(std::string name, int len, bool withCounter) {
|
|
sharedServer();
|
|
init(name, len, withCounter);
|
|
}
|
|
|
|
///\brief Initialize the server
|
|
///\param name The basename of this server
|
|
///\param len The lenght of the payload
|
|
///\param withCounter Whether the content should have a counter
|
|
void sharedServer::init(std::string name, int len, bool withCounter) {
|
|
amount = 0;
|
|
if (mySemaphore) {
|
|
mySemaphore.close();
|
|
}
|
|
if (baseName != "") {
|
|
mySemaphore.unlink();
|
|
}
|
|
myPages.clear();
|
|
baseName = name;
|
|
payLen = len;
|
|
hasCounter = withCounter;
|
|
mySemaphore.open(std::string("/" + baseName).c_str(), O_CREAT | O_EXCL | O_RDWR, ACCESSPERMS, 1);
|
|
if (!mySemaphore) {
|
|
mySemaphore.open(std::string("/" + baseName).c_str(), O_CREAT | O_RDWR, ACCESSPERMS, 1);
|
|
}
|
|
if (!mySemaphore) {
|
|
DEBUG_MSG(DLVL_FAIL, "Creating semaphore failed: %s", strerror(errno));
|
|
return;
|
|
}
|
|
newPage();
|
|
newPage();
|
|
newPage();
|
|
newPage();
|
|
newPage();
|
|
}
|
|
|
|
///\brief The deconstructor
|
|
sharedServer::~sharedServer() {
|
|
mySemaphore.close();
|
|
mySemaphore.unlink();
|
|
}
|
|
|
|
///\brief Determines whether a sharedServer is valid
|
|
sharedServer::operator bool() const {
|
|
return myPages.size();
|
|
}
|
|
|
|
///\brief Creates the next page with the correct size
|
|
void sharedServer::newPage() {
|
|
semGuard tmpGuard(mySemaphore);
|
|
sharedPage tmp(std::string(baseName + (char)(myPages.size() + (int)'A')), (4096 << myPages.size()), true);
|
|
myPages.insert(tmp);
|
|
tmp.master = false;
|
|
DEBUG_MSG(DLVL_MEDIUM, "Added a new page: %s", tmp.name.c_str());
|
|
}
|
|
|
|
///\brief Deletes the highest allocated page
|
|
void sharedServer::deletePage() {
|
|
if (myPages.size() == 1) {
|
|
DEBUG_MSG(DLVL_WARN, "Can't remove last page for %s", baseName.c_str());
|
|
return;
|
|
}
|
|
semGuard tmpGuard(mySemaphore);
|
|
myPages.erase((*myPages.rbegin()));
|
|
}
|
|
|
|
///\brief Determines whether an id is currently in use or not
|
|
bool sharedServer::isInUse(unsigned int id) {
|
|
unsigned int i = 0;
|
|
for (std::set<sharedPage>::iterator it = myPages.begin(); it != myPages.end(); it++) {
|
|
//return if we reached the end
|
|
if (!it->mapped || !it->len) {
|
|
return false;
|
|
}
|
|
//not on this page? skip to next.
|
|
if (it->len < (id - i)*payLen) {
|
|
i += it->len / payLen;
|
|
continue;
|
|
}
|
|
if (hasCounter) {
|
|
//counter? return true if it is non-zero.
|
|
return (it->mapped[(id - i) * payLen] != 0);
|
|
} else {
|
|
//no counter - check the entire size for being all zeroes.
|
|
for (unsigned int j = 0; j < payLen; ++j) {
|
|
if (it->mapped[(id - i)*payLen + j]) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
}
|
|
//only happens if we run out of pages
|
|
return false;
|
|
}
|
|
|
|
///\brief Parse each of the possible payload pieces, and runs a callback on it if in use.
|
|
void sharedServer::parseEach(void (*callback)(char * data, size_t len, unsigned int id)) {
|
|
char * empty = 0;
|
|
if (!hasCounter) {
|
|
empty = (char *)malloc(payLen * sizeof(char));
|
|
memset(empty, 0, payLen);
|
|
}
|
|
unsigned int id = 0;
|
|
for (std::set<sharedPage>::iterator it = myPages.begin(); it != myPages.end(); it++) {
|
|
if (!it->mapped || !it->len) {
|
|
DEBUG_MSG(DLVL_FAIL, "Something went terribly wrong?");
|
|
break;
|
|
}
|
|
unsigned int offset = 0;
|
|
while (offset + payLen + (hasCounter ? 1 : 0) <= it->len) {
|
|
if (hasCounter) {
|
|
if (it->mapped[offset] != 0) {
|
|
int counter = it->mapped[offset];
|
|
//increase the count if needed
|
|
if (id >= amount) {
|
|
amount = id + 1;
|
|
DEBUG_MSG(DLVL_VERYHIGH, "Shared memory %s is now at count %u", baseName.c_str(), amount);
|
|
}
|
|
callback(it->mapped + offset + 1, payLen, id);
|
|
switch (counter) {
|
|
case 127:
|
|
DEBUG_MSG(DLVL_HIGH, "Client %u requested disconnect", id);
|
|
break;
|
|
case 126:
|
|
DEBUG_MSG(DLVL_HIGH, "Client %u timed out", id);
|
|
break;
|
|
case 255:
|
|
DEBUG_MSG(DLVL_HIGH, "Client %u disconnected on request", id);
|
|
break;
|
|
case 254:
|
|
DEBUG_MSG(DLVL_HIGH, "Client %u disconnect timed out", id);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
if (counter == 127 || counter == 126 || counter == 255 || counter == 254) {
|
|
memset(it->mapped + offset + 1, 0, payLen);
|
|
it->mapped[offset] = 0;
|
|
} else {
|
|
it->mapped[offset] ++;
|
|
}
|
|
} else {
|
|
//stop if we're past the amount counted and we're empty
|
|
if (id >= amount - 1) {
|
|
//bring the counter down if this was the last element
|
|
if (id == amount - 1) {
|
|
amount = id;
|
|
DEBUG_MSG(DLVL_VERYHIGH, "Shared memory %s is now at count %u", baseName.c_str(), amount);
|
|
}
|
|
//stop, we're guaranteed no more pages are full at this point
|
|
return;
|
|
}
|
|
}
|
|
} else {
|
|
if (memcmp(empty, it->mapped + offset, payLen)) {
|
|
//increase the count if needed
|
|
if (id >= amount) {
|
|
amount = id + 1;
|
|
DEBUG_MSG(DLVL_VERYHIGH, "Shared memory %s is now at count %u", baseName.c_str(), amount);
|
|
}
|
|
callback(it->mapped + offset, payLen, id);
|
|
} else {
|
|
//stop if we're past the amount counted and we're empty
|
|
if (id >= amount - 1) {
|
|
//bring the counter down if this was the last element
|
|
if (id == amount - 1) {
|
|
amount = id;
|
|
DEBUG_MSG(DLVL_VERYHIGH, "Shared memory %s is now at count %u", baseName.c_str(), amount);
|
|
}
|
|
//stop, we're guaranteed no more pages are full at this point
|
|
if (empty) {
|
|
free(empty);
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
offset += payLen + (hasCounter ? 1 : 0);
|
|
id ++;
|
|
}
|
|
}
|
|
if (empty) {
|
|
free(empty);
|
|
}
|
|
}
|
|
|
|
///\brief Creates an empty shared client
|
|
sharedClient::sharedClient() {
|
|
hasCounter = 0;
|
|
payLen = 0;
|
|
offsetOnPage = 0;
|
|
}
|
|
|
|
///\brief Copy constructor for sharedClients
|
|
///\param rhs The client ro copy
|
|
sharedClient::sharedClient(const sharedClient & rhs) {
|
|
baseName = rhs.baseName;
|
|
payLen = rhs.payLen;
|
|
hasCounter = rhs.hasCounter;
|
|
#ifdef __APPLE__
|
|
//note: O_CREAT is only needed for mac, probably
|
|
mySemaphore.open(std::string("/" + baseName).c_str(), O_RDWR | O_CREAT, 0);
|
|
#else
|
|
mySemaphore.open(std::string("/" + baseName).c_str(), O_RDWR);
|
|
#endif
|
|
if (!mySemaphore) {
|
|
DEBUG_MSG(DLVL_FAIL, "Creating semaphore failed: %s", strerror(errno));
|
|
return;
|
|
}
|
|
semGuard tmpGuard(mySemaphore);
|
|
myPage.init(rhs.myPage.name, rhs.myPage.len, rhs.myPage.master);
|
|
offsetOnPage = rhs.offsetOnPage;
|
|
}
|
|
|
|
///\brief Assignment operator
|
|
void sharedClient::operator =(const sharedClient & rhs) {
|
|
baseName = rhs.baseName;
|
|
payLen = rhs.payLen;
|
|
hasCounter = rhs.hasCounter;
|
|
#ifdef __APPLE__
|
|
//note: O_CREAT is only needed for mac, probably
|
|
mySemaphore.open(std::string("/" + baseName).c_str(), O_RDWR | O_CREAT, 0);
|
|
#else
|
|
mySemaphore.open(std::string("/" + baseName).c_str(), O_RDWR);
|
|
#endif
|
|
if (!mySemaphore) {
|
|
DEBUG_MSG(DLVL_FAIL, "Creating semaphore failed: %s", strerror(errno));
|
|
return;
|
|
}
|
|
semGuard tmpGuard(mySemaphore);
|
|
myPage.init(rhs.myPage.name, rhs.myPage.len, rhs.myPage.master);
|
|
offsetOnPage = rhs.offsetOnPage;
|
|
}
|
|
|
|
///\brief SharedClient Constructor, allocates space on the correct page.
|
|
///\param name The basename of the server to connect to
|
|
///\param len The size of the payload to allocate
|
|
///\param withCounter Whether or not this payload has a counter
|
|
sharedClient::sharedClient(std::string name, int len, bool withCounter) : baseName(name), payLen(len), offsetOnPage(-1), hasCounter(withCounter) {
|
|
#ifdef __APPLE__
|
|
//note: O_CREAT is only needed for mac, probably
|
|
mySemaphore.open(std::string("/" + baseName).c_str(), O_RDWR | O_CREAT, 0);
|
|
#else
|
|
mySemaphore.open(std::string("/" + baseName).c_str(), O_RDWR);
|
|
#endif
|
|
if (!mySemaphore) {
|
|
DEBUG_MSG(DLVL_FAIL, "Creating semaphore failed: %s", strerror(errno));
|
|
return;
|
|
}
|
|
semGuard tmpGuard(mySemaphore);
|
|
char * empty = 0;
|
|
if (!hasCounter) {
|
|
empty = (char *)malloc(payLen * sizeof(char));
|
|
if (!empty) {
|
|
DEBUG_MSG(DLVL_FAIL, "Failed to allocate %u bytes for empty payload!", payLen);
|
|
return;
|
|
}
|
|
memset(empty, 0, payLen);
|
|
}
|
|
for (char i = 'A'; i <= 'Z'; i++) {
|
|
myPage.init(baseName + i, (4096 << (i - 'A')));
|
|
int offset = 0;
|
|
while (offset + payLen + (hasCounter ? 1 : 0) <= myPage.len) {
|
|
if ((hasCounter && myPage.mapped[offset] == 0) || (!hasCounter && !memcmp(myPage.mapped + offset, empty, payLen))) {
|
|
offsetOnPage = offset;
|
|
if (hasCounter) {
|
|
myPage.mapped[offset] = 1;
|
|
}
|
|
break;
|
|
}
|
|
offset += payLen + (hasCounter ? 1 : 0);
|
|
}
|
|
if (offsetOnPage != -1) {
|
|
break;
|
|
}
|
|
}
|
|
free(empty);
|
|
}
|
|
|
|
///\brief The deconstructor
|
|
sharedClient::~sharedClient() {
|
|
if (hasCounter) {
|
|
finish();
|
|
}
|
|
mySemaphore.close();
|
|
}
|
|
|
|
///\brief Writes data to the shared data
|
|
void sharedClient::write(char * data, int len) {
|
|
if (hasCounter) {
|
|
keepAlive();
|
|
}
|
|
memcpy(myPage.mapped + offsetOnPage + (hasCounter ? 1 : 0), data, std::min(len, payLen));
|
|
}
|
|
|
|
///\brief Indicate that the process is done using this piece of memory, set the counter to finished
|
|
void sharedClient::finish() {
|
|
if (!hasCounter) {
|
|
DEBUG_MSG(DLVL_WARN, "Trying to time-out an element without counters");
|
|
return;
|
|
}
|
|
if (myPage.mapped) {
|
|
myPage.mapped[offsetOnPage] = 127;
|
|
}
|
|
}
|
|
|
|
///\brief Re-initialize the counter
|
|
void sharedClient::keepAlive() {
|
|
if (!hasCounter) {
|
|
DEBUG_MSG(DLVL_WARN, "Trying to keep-alive an element without counters");
|
|
return;
|
|
}
|
|
if (myPage.mapped[offsetOnPage] < 128) {
|
|
myPage.mapped[offsetOnPage] = 1;
|
|
} else {
|
|
DEBUG_MSG(DLVL_WARN, "Trying to keep-alive an element that needs to timeout, ignoring");
|
|
}
|
|
}
|
|
|
|
///\brief Get a pointer to the data of this client
|
|
char * sharedClient::getData() {
|
|
if (!myPage.mapped) {
|
|
return 0;
|
|
}
|
|
return (myPage.mapped + offsetOnPage + (hasCounter ? 1 : 0));
|
|
}
|
|
}
|
|
|