ptsname - Online Linux Manual PageSection : 3
Updated : 2023-02-05
Source : Linux man-pages 6.03

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NAMEptsname, ptsname_r − get the name of the slave pseudoterminal

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LIBRARYStandard C library (libc, −lc)

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SYNOPSIS#include <stdlib.h>char *ptsname(int fd); int ptsname_r(int fd, char buf[.buflen], 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_SOURCEptsname_r(): _GNU_SOURCE

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DESCRIPTIONThe 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.

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RETURN VALUEOn 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.

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ERRORSEINVAL  (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.

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VERSIONSptsname() is provided since glibc 2.1.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue ptsname() Thread safetyMT-Unsafe race:ptsname ptsname_r() Thread safetyMT-Safe

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STANDARDSptsname():  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.

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SEE ALSOgrantpt(3), posix_openpt(3), ttyname(3), unlockpt(3), pts(4), pty(7) 0

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