Manpages - ptsname.3

ptsname, ptsname_r - get the name of the slave pseudoterminal

  #include <stdlib.h>

  char *ptsname(int fd);
  int ptsname_r(int fd, char *buf, size_t buflen);

Feature Test Macro Requirements for glibc (see *feature_test_macros*(7)):

*ptsname*():

      Since glibc 2.24:
          _XOPEN_SOURCE >= 500
      Glibc 2.23 and earlier:
          _XOPEN_SOURCE

*ptsname_r*():

      _GNU_SOURCE

The *ptsname*() function returns the name of the slave pseudoterminal device corresponding to the master referred to by the file descriptor fd.

The *ptsname_r*() function is the reentrant equivalent of *ptsname*(). It returns the name of the slave pseudoterminal device as a null-terminated string in the buffer pointed to by buf. The buflen argument specifies the number of bytes available in buf.

On success, *ptsname*() returns a pointer to a string in static storage which will be overwritten by subsequent calls. This pointer must not be freed. On failure, NULL is returned.

On success, *ptsname_r*() returns 0. On failure, an error number is returned to indicate the error.

EINVAL

(*ptsname_r*() only) buf is NULL. (This error is returned only for glibc 2.25 and earlier.)

ENOTTY

fd does not refer to a pseudoterminal master device.

ERANGE

(*ptsname_r*() only) buf is too small.

*ptsname*() is provided in glibc since version 2.1.

For an explanation of the terms used in this section, see *attributes*(7).

*ptsname*(): POSIX.1-2001, POSIX.1-2008.

*ptsname*() is part of the UNIX 98 pseudoterminal support (see *pts*(4)).

*ptsname_r*() is a Linux extension, that is proposed for inclusion in the next major revision of POSIX.1 (Issue 8). A version of this function is documented on Tru64 and HP-UX, but on those implementations, -1 is returned on error, with errno set to indicate the error. Avoid using this function in portable programs.

*grantpt*(3), *posix_openpt*(3), *ttyname*(3), *unlockpt*(3), *pts*(4), *pty*(7)

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