58 lines
1.0 KiB
C
58 lines
1.0 KiB
C
#include <pty.h>
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#include <utmp.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/wait.h>
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#include <pthread.h>
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int forkpty(int *pm, char *name, const struct termios *tio, const struct winsize *ws)
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{
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int m, s, ec=0, p[2], cs;
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pid_t pid=-1;
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sigset_t set, oldset;
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if (openpty(&m, &s, name, tio, ws) < 0) return -1;
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sigfillset(&set);
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pthread_sigmask(SIG_BLOCK, &set, &oldset);
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pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
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if (pipe2(p, O_CLOEXEC)) {
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close(s);
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goto out;
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}
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pid = fork();
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if (!pid) {
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close(m);
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close(p[0]);
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if (login_tty(s)) {
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write(p[1], &errno, sizeof errno);
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_exit(127);
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}
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close(p[1]);
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pthread_setcancelstate(cs, 0);
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pthread_sigmask(SIG_SETMASK, &oldset, 0);
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return 0;
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}
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close(s);
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close(p[1]);
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if (read(p[0], &ec, sizeof ec) > 0) {
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int status;
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waitpid(pid, &status, 0);
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pid = -1;
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errno = ec;
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}
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close(p[0]);
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out:
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if (pid > 0) *pm = m;
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else close(m);
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pthread_setcancelstate(cs, 0);
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pthread_sigmask(SIG_SETMASK, &oldset, 0);
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return pid;
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}
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