Seems very reasonable.
joshua stein <j...@openbsd.org> wrote:
> The spec says the behavior of anything other than O_RDWR and
> O_NOCTTY is unspecified, but FreeBSD allows passing O_CLOEXEC.
>
>
> Index: lib/libc/stdlib/posix_openpt.3
> ===================================================================
> RCS file: /cvs/src/lib/libc/stdlib/posix_openpt.3,v
> retrieving revision 1.4
> diff -u -p -u -p -r1.4 posix_openpt.3
> --- lib/libc/stdlib/posix_openpt.3 25 Jan 2019 00:19:25 -0000 1.4
> +++ lib/libc/stdlib/posix_openpt.3 5 Feb 2020 21:41:00 -0000
> @@ -45,7 +45,7 @@ argument is formed by bitwise-inclusive
> .Tn OR Ns 'ing
> the following values defined in
> .In fcntl.h :
> -.Bl -tag -width O_NOCTTY -offset indent
> +.Bl -tag -width O_CLOEXEC -offset indent
> .It Dv O_RDWR
> Open for reading and writing.
> .It Dv O_NOCTTY
> @@ -53,6 +53,8 @@ Prevent the device from being made the c
> This flag has no effect on
> .Ox
> and is included for compatibility with other systems.
> +.It Dv O_CLOEXEC
> +Set the close-on-exec flag for the new file descriptor.
> .El
> .Pp
> The
> Index: lib/libc/stdlib/posix_pty.c
> ===================================================================
> RCS file: /cvs/src/lib/libc/stdlib/posix_pty.c,v
> retrieving revision 1.3
> diff -u -p -u -p -r1.3 posix_pty.c
> --- lib/libc/stdlib/posix_pty.c 25 Jan 2019 00:19:25 -0000 1.3
> +++ lib/libc/stdlib/posix_pty.c 5 Feb 2020 21:41:00 -0000
> @@ -36,13 +36,13 @@ posix_openpt(int oflag)
>
> /* User must specify O_RDWR in oflag. */
> if ((oflag & O_ACCMODE) != O_RDWR ||
> - (oflag & ~(O_ACCMODE | O_NOCTTY)) != 0) {
> + (oflag & ~(O_ACCMODE | O_NOCTTY | O_CLOEXEC)) != 0) {
> errno = EINVAL;
> return -1;
> }
>
> /* Get pty master and slave (this API only uses the master). */
> - fd = open(PATH_PTMDEV, O_RDWR);
> + fd = open(PATH_PTMDEV, oflag);
> if (fd != -1) {
> if (ioctl(fd, PTMGET, &ptm) != -1) {
> close(ptm.sfd);
>
