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13.69.20 ptsname_r

Documentation:

• https://www.gnu.org/software/libc/manual/html_node/Allocation.html,
• man ptsname_r.

Gnulib module: ptsname_r

Portability problems fixed by Gnulib:

• This function is missing on some platforms: Mac OS X 10.12, FreeBSD 12.0, NetBSD 5.0, OpenBSD 6.7, Minix 3.1.8, AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 11.4, Cygwin 1.7.9, mingw, MSVC 14.
• When this function fails, it returns -1 instead of the error code on some platforms: macOS 11.1, FreeBSD 14.0, Android 4.3.

Portability problems not fixed by Gnulib:

• When this function fails, it returns 0 and stores an empty string as result on some platforms: Cygwin 2.9.

Note: Portable programs should expect to find the error code as the return value of this function, not as the value of errno. This is needed for compatibility with musl libc and with the forthcoming POSIX Issue 8.