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simplify ctermid

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opening /dev/tty then using ttyname_r on it does not produce a
canonical terminal name; it simply yields "/dev/tty".

it would be possible to make ctermid determine the actual controlling
terminal device via field 7 of /proc/self/stat, but doing so would
introduce a buffer overflow into applications built with L_ctermid==9,
which glibc defines, adversely affecting the quality of ABI compat.
This commit is contained in:
Rich Felker 2015-01-12 00:59:49 -05:00
parent 699d4532f6
commit 9772eadba8
1 changed files with 2 additions and 14 deletions
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16
src/unistd/ctermid.c
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@ -1,19 +1,7 @@
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <limits.h>
#include "syscall.h"
#include <string.h>
char *ctermid(char *s)
{
static char s2[L_ctermid];
int fd;
if (!s) s = s2;
*s = 0;
fd = open("/dev/tty", O_WRONLY | O_NOCTTY | O_CLOEXEC);
if (fd >= 0) {
ttyname_r(fd, s, L_ctermid);
__syscall(SYS_close, fd);
}
return s;
return s ? strcpy(s, "/dev/tty") : "/dev/tty";
}