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#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <sys/wait.h>
#include <errno.h>
#include <vdr/tools.h>
#include <vdr/thread.h>
#include "extpipe.h"
cExtPipe::cExtPipe(void)
{
pid = -1;
f_stderr = -1;
f_stdout= -1;
}
cExtPipe::~cExtPipe()
{
int status;
Close(status);
}
bool cExtPipe::Open(const char *Command)
{
int fd_stdout[2];
int fd_stderr[2];
if (pipe(fd_stdout) < 0)
{
LOG_ERROR;
return false;
}
if (pipe(fd_stderr) < 0)
{
close(fd_stdout[0]);
close(fd_stdout[1]);
LOG_ERROR;
return false;
}
if ((pid = fork()) < 0) // fork failed
{
LOG_ERROR;
close(fd_stdout[0]);
close(fd_stdout[1]);
close(fd_stderr[0]);
close(fd_stderr[1]);
return false;
}
if (pid > 0) // parent process
{
close(fd_stdout[1]); // close write fd, we need only read fd
close(fd_stderr[1]); // close write fd, we need only read fd
f_stdout = fd_stdout[0];
f_stderr = fd_stderr[0];
return true;
}
else // child process
{
close(fd_stdout[0]); // close read fd, we need only write fd
close(fd_stderr[0]); // close read fd, we need only write fd
if (dup2(fd_stdout[1], STDOUT_FILENO) == -1) // now redirect
{
LOG_ERROR;
close(fd_stderr[1]);
close(fd_stdout[1]);
_exit(-1);
}
if (dup2(fd_stderr[1], STDERR_FILENO) == -1) // now redirect
{
LOG_ERROR;
close(fd_stderr[1]);
close(fd_stdout[1]);
_exit(-1);
}
int MaxPossibleFileDescriptors = getdtablesize();
for (int i = STDERR_FILENO + 1; i < MaxPossibleFileDescriptors; i++)
close(i); //close all dup'ed filedescriptors
if (execl("/bin/sh", "sh", "-c", Command, NULL) == -1)
{
LOG_ERROR_STR(Command);
close(fd_stderr[1]);
close(fd_stdout[1]);
_exit(-1);
}
_exit(0);
}
}
int cExtPipe::Close(int &status)
{
int ret = -1;
if (f_stderr!=-1)
{
close(f_stderr);
f_stderr = -1;
}
if (f_stdout!=-1)
{
close(f_stdout);
f_stdout=-1;
}
if (pid > 0)
{
int i = 5;
while (i > 0)
{
ret = waitpid(pid, &status, WNOHANG);
if (ret < 0)
{
if (errno != EINTR && errno != ECHILD)
{
LOG_ERROR;
break;
}
}
else if (ret == pid)
break;
i--;
cCondWait::SleepMs(100);
}
if (!i)
{
kill(pid, SIGKILL);
ret = -1;
}
else if (ret == -1 || !WIFEXITED(status))
ret = -1;
pid = -1;
}
return ret;
}
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