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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 = NULL;
}
cExtPipe::~cExtPipe()
{
int status;
Close(status);
}
bool cExtPipe::Open(const char *Command, const char *Mode)
{
int fd[2];
if (pipe(fd) < 0)
{
LOG_ERROR;
return false;
}
if ((pid = fork()) < 0) // fork failed
{
LOG_ERROR;
close(fd[0]);
close(fd[1]);
return false;
}
const char *mode = "w";
int iopipe = 0;
if (pid > 0) // parent process
{
if (strcmp(Mode, "r") == 0)
{
mode = "r";
iopipe = 1;
}
close(fd[iopipe]);
if ((f = fdopen(fd[1 - iopipe], mode)) == NULL)
{
LOG_ERROR;
close(fd[1 - iopipe]);
}
return f != NULL;
}
else // child process
{
int iofd = STDOUT_FILENO;
if (strcmp(Mode, "w") == 0)
{
mode = "r";
iopipe = 1;
iofd = STDIN_FILENO;
}
close(fd[iopipe]);
if (dup2(fd[1 - iopipe], iofd) == -1) // now redirect
{
LOG_ERROR;
close(fd[1 - iopipe]);
_exit(-1);
}
else
{
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[1 - iopipe]);
_exit(-1);
}
}
_exit(0);
}
}
int cExtPipe::Close(int &status)
{
int ret = -1;
if (f)
{
fclose(f);
f = NULL;
}
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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