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authorBenjamin Peterson <benjamin@python.org>2018-09-13 14:23:42 -0700
committerRich Felker <dalias@aerifal.cx>2018-09-15 01:58:03 -0400
commitc84971995b3a6d5118f9357c040572f4c78bcd55 (patch)
tree36b663dffd83bc09199d01f34f77126167c71ccb /src/unistd
parente13063aad7aee341d278d2a879a76ec7b59b2ad8 (diff)
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improve error handling of ttyname_r and isatty
POSIX allows ttyname(_r) and isatty to return EBADF if passed file descriptor is invalid. maintainer's note: these are optional ("may fail") errors, but it's non-conforming for ttyname_r to return ENOTTY when it failed for a different reason.
Diffstat (limited to 'src/unistd')
-rw-r--r--src/unistd/isatty.c6
-rw-r--r--src/unistd/ttyname_r.c2
2 files changed, 6 insertions, 2 deletions
diff --git a/src/unistd/isatty.c b/src/unistd/isatty.c
index c8badaf..75a9c18 100644
--- a/src/unistd/isatty.c
+++ b/src/unistd/isatty.c
@@ -1,9 +1,13 @@
#include <unistd.h>
+#include <errno.h>
#include <sys/ioctl.h>
#include "syscall.h"
int isatty(int fd)
{
struct winsize wsz;
- return !__syscall(SYS_ioctl, fd, TIOCGWINSZ, &wsz);
+ unsigned long r = syscall(SYS_ioctl, fd, TIOCGWINSZ, &wsz);
+ if (r == 0) return 1;
+ if (errno != EBADF) errno = ENOTTY;
+ return 0;
}
diff --git a/src/unistd/ttyname_r.c b/src/unistd/ttyname_r.c
index cb364c2..82acb75 100644
--- a/src/unistd/ttyname_r.c
+++ b/src/unistd/ttyname_r.c
@@ -9,7 +9,7 @@ int ttyname_r(int fd, char *name, size_t size)
char procname[sizeof "/proc/self/fd/" + 3*sizeof(int) + 2];
ssize_t l;
- if (!isatty(fd)) return ENOTTY;
+ if (!isatty(fd)) return errno;
__procfdname(procname, fd);
l = readlink(procname, name, size);