提交 1227e418 编写于 作者: R Rich Felker

block pthread cancellation in openpty function

being a nonstandard function, this isn't strictly necessary, but it's
inexpensive and avoids unpleasant surprises. eventually I would like
all functions in libc to be safe against cancellation, either ignoring
it or acting on it cleanly.
上级 3b26a32d
...@@ -3,33 +3,38 @@ ...@@ -3,33 +3,38 @@
#include <unistd.h> #include <unistd.h>
#include <pty.h> #include <pty.h>
#include <stdio.h> #include <stdio.h>
#include <pthread.h>
/* Nonstandard, but vastly superior to the standard functions */ /* Nonstandard, but vastly superior to the standard functions */
int openpty(int *pm, int *ps, char *name, const struct termios *tio, const struct winsize *ws) int openpty(int *pm, int *ps, char *name, const struct termios *tio, const struct winsize *ws)
{ {
int m, s, n=0; int m, s, n=0, cs;
char buf[20]; char buf[20];
m = open("/dev/ptmx", O_RDWR|O_NOCTTY); m = open("/dev/ptmx", O_RDWR|O_NOCTTY);
if (m < 0) return -1; if (m < 0) return -1;
if (ioctl(m, TIOCSPTLCK, &n) || ioctl (m, TIOCGPTN, &n)) { pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
close(m);
return -1; if (ioctl(m, TIOCSPTLCK, &n) || ioctl (m, TIOCGPTN, &n))
} goto fail;
if (!name) name = buf; if (!name) name = buf;
snprintf(name, sizeof buf, "/dev/pts/%d", n); snprintf(name, sizeof buf, "/dev/pts/%d", n);
if ((s = open(name, O_RDWR|O_NOCTTY)) < 0) { if ((s = open(name, O_RDWR|O_NOCTTY)) < 0)
close(m); goto fail;
return -1;
}
if (tio) tcsetattr(s, TCSANOW, tio); if (tio) tcsetattr(s, TCSANOW, tio);
if (ws) ioctl(s, TIOCSWINSZ, ws); if (ws) ioctl(s, TIOCSWINSZ, ws);
*pm = m; *pm = m;
*ps = s; *ps = s;
pthread_setcancelstate(cs, 0);
return 0; return 0;
fail:
close(m);
pthread_setcancelstate(cs, 0);
return -1;
} }
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