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#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/wait.h>
#include <errno.h>
int system(const char *cmd)
{
pid_t pid;
sigset_t old, new;
struct sigaction sa, oldint, oldquit;
int status;
if (!cmd) return 1;
sa.sa_handler = SIG_IGN;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sigaction(SIGINT, &sa, &oldint);
sigaction(SIGQUIT, &sa, &oldquit);
sigaddset(&sa.sa_mask, SIGCHLD);
sigprocmask(SIG_BLOCK, &new, &old);
pid = fork();
if (pid <= 0) {
sigaction(SIGINT, &oldint, NULL);
sigaction(SIGQUIT, &oldquit, NULL);
sigprocmask(SIG_SETMASK, &old, NULL);
if (pid == 0) {
execl("/bin/sh", "sh", "-c", cmd, (char *)0);
_exit(127);
}
return -1;
}
while (waitpid(pid, &status, 0) == -1)
if (errno != EINTR) {
status = -1;
break;
}
sigaction(SIGINT, &oldint, NULL);
sigaction(SIGQUIT, &oldquit, NULL);
sigprocmask(SIG_SETMASK, &old, NULL);
return status;
}
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