[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <20180915064710.GR1878@brightrain.aerifal.cx>
Date: Sat, 15 Sep 2018 02:47:10 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: [PATCH v2] improve error handling of ttyname_r and isatty
On Thu, Sep 13, 2018 at 02:23:42PM -0700, Benjamin Peterson wrote:
> POSIX allows ttyname(_r) and isatty to return EBADF if passed file descriptor is
> invalid.
> ---
> 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 33aa4ae1..24106ad8 100644
> --- a/src/unistd/ttyname_r.c
> +++ b/src/unistd/ttyname_r.c
> @@ -10,7 +10,7 @@ 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);
> --
> 2.17.1
Thanks, applying.
Rich
Powered by blists - more mailing lists
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
