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From c84971995b3a6d5118f9357c040572f4c78bcd55 Mon Sep 17 00:00:00 2001
From: Benjamin Peterson <benjamin@python.org>
Date: Thu, 13 Sep 2018 14:23:42 -0700
Subject: 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.
---
src/unistd/isatty.c | 6 +++++-
src/unistd/ttyname_r.c | 2 +-
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/src/unistd/isatty.c b/src/unistd/isatty.c
index c8badaf5..75a9c186 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 cb364c29..82acb75e 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);
--
cgit v1.2.1
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