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| | #include <pty.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <fcntl.h>
int forkpty(int *m, char *name, const struct termios *tio, const struct winsize *ws)
{
int s, t, i, istmp[3]={0};
pid_t pid;
if (openpty(m, &s, name, tio, ws) < 0) return -1;
/* Ensure before forking that we don't exceed fd limit */
for (i=0; i<3; i++) {
if (fcntl(i, F_GETFL) < 0) {
t = fcntl(s, F_DUPFD, i);
if (t<0) break;
else if (t!=i) close(t);
else istmp[i] = 1;
}
}
pid = i==3 ? fork() : -1;
if (!pid) {
close(*m);
setsid();
ioctl(s, TIOCSCTTY, (char *)0);
dup2(s, 0);
dup2(s, 1);
dup2(s, 2);
if (s>2) close(s);
return 0;
}
for (i=0; i<3; i++)
if (istmp[i]) close(i);
close(s);
if (pid < 0) close(*m);
return pid;
}
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