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authorRich Felker <dalias@aerifal.cx>2015-01-12 00:59:49 -0500
committerRich Felker <dalias@aerifal.cx>2015-01-12 00:59:49 -0500
commit9772eadba8f8b32a1744c4df5048d70c567f6082 (patch)
treea84dc010cc286e3c63884c1666679bb5885e74d2 /src
parent699d4532f6a8f792271c7f46608e2505ca3afc21 (diff)
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simplify ctermid
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.
Diffstat (limited to 'src')
-rw-r--r--src/unistd/ctermid.c16
1 files changed, 2 insertions, 14 deletions
diff --git a/src/unistd/ctermid.c b/src/unistd/ctermid.c
index 77684050..1612770a 100644
--- a/src/unistd/ctermid.c
+++ b/src/unistd/ctermid.c
@@ -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";
 }