git: c90c45ac725b - stable/13 - ptsname.3: accommodate upcoming POSIX Issue 8 ptsname_r

The branch stable/13 has been updated by emaste:

URL: https://cgit.FreeBSD.org/src/commit/?id=c90c45ac725ba2a7f9bb940a1d555a025b7e47aa

commit c90c45ac725ba2a7f9bb940a1d555a025b7e47aa
Author:     Ed Maste <emaste@FreeBSD.org>
AuthorDate: 2023-10-13 20:25:53 +0000
Commit:     Ed Maste <emaste@FreeBSD.org>
CommitDate: 2023-10-16 17:52:57 +0000

    ptsname.3: accommodate upcoming POSIX Issue 8 ptsname_r
    
    POSIX has accepted a proposal[1] to add glibc-compatible ptsname_r.  It
    indicates an error by returning the error number, rather than returning
    -1 and setting errno.  Update RETURN VALUES in ptsname_r's man page now
    to encourage folks to test that the return value != 0 rather than == -1.
    
    [1] https://www.austingroupbugs.net/bug_view_page.php?bug_id=508
    
    Reported by:    Collin Funk
    Reviewed by:    kib
    Sponsored by:   The FreeBSD Foundation
    Differential Revision: https://reviews.freebsd.org/D42204
    
    (cherry picked from commit a5ed6a815e38d6c622cd97a6020592ded579cf7a)
---
 lib/libc/stdlib/ptsname.3 | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/lib/libc/stdlib/ptsname.3 b/lib/libc/stdlib/ptsname.3
index 532ce9e92ae0..df23e9ae6129 100644
--- a/lib/libc/stdlib/ptsname.3
+++ b/lib/libc/stdlib/ptsname.3
@@ -29,7 +29,7 @@
 .\" NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 .\" SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd October 17, 2020
+.Dd October 14, 2023
 .Dt PTSNAME 3
 .Os
 .Sh NAME
@@ -104,7 +104,7 @@ function clears the lock held on the pseudo-terminal pair
 for the master device specified with
 .Fa fildes .
 .Sh RETURN VALUES
-.Rv -std grantpt ptsname_r unlockpt
+.Rv -std grantpt unlockpt
 .Pp
 The
 .Fn ptsname
@@ -112,6 +112,19 @@ function returns a pointer to the name
 of the slave device on success; otherwise a
 .Dv NULL
 pointer is returned.
+.Pp
+The
+.Fn ptsname_r
+function returns the value 0 if successful;
+otherwise a nonzero value is returned and the global variable
+.Va errno
+is set to indicate the error.
+Note:
+.Fn ptsname_r
+was previously documented as returning -1 on error.
+In the future it will be changed to return an error number, for POSIX
+compatibility.
+Therefore, callers should not check for -1.
 .Sh ERRORS
 The
 .Fn grantpt ,