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#include "dpopen.h"
#include <sys/wait.h>
#include <unistd.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
extern char **environ;
pid_t dpopen(const char *command, FILE **in, FILE **out)
{
pid_t pid;
int i;
int result;
int stdin_fd[2];
int stdout_fd[2];
result = pipe(stdin_fd);
if (result < 0)
return 0;
result = pipe(stdout_fd);
if (result < 0) {
close(stdin_fd[0]);
close(stdin_fd[1]);
return 0;
}
pid = fork();
if (pid > 0) {
close(stdin_fd[0]);
close(stdout_fd[1]);
*in = fdopen(stdin_fd[1], "w");
if (*in == NULL) {
close(stdin_fd[1]);
close(stdout_fd[0]);
kill(pid, SIGKILL);
return 0;
}
*out = fdopen(stdout_fd[0], "r");
if (*out == NULL) {
fclose(*in);
close(stdout_fd[0]);
kill(pid, SIGKILL);
return 0;
}
return pid;
} else if (pid == 0) {
close(stdin_fd[1]);
close(stdout_fd[0]);
close(STDIN_FILENO);
dup2(stdin_fd[0], STDIN_FILENO);
close(STDOUT_FILENO);
dup2(stdout_fd[1], STDOUT_FILENO);
close(STDERR_FILENO);
dup2(stdout_fd[1], STDERR_FILENO);
for (i = STDERR_FILENO + 1; i < _POSIX_OPEN_MAX; i++)
close(i);
return execl("/bin/sh", "sh", "-c", command, (char *)0);
} else {
close(stdin_fd[0]);
close(stdin_fd[1]);
close(stdout_fd[0]);
close(stdout_fd[1]);
return 0;
}
}
int dpclose(FILE *in, FILE *out, pid_t pid)
{
if (in)
fclose(in);
if (out)
fclose(out);
while (1) {
int status;
int result = waitpid(pid, &status, 0);
if (result == pid) {
return WIFEXITED(status) ? status : -1;
} else if (errno == EINTR) {
continue;
} else {
return -1; /* errno is set */
}
}
}
/* vim: set noexpandtab tabstop=8: */
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