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PTSNAME(3) - Linux manual page online | Library functions

Get the name of the slave pseudoterminal.

PTSNAME(3) Linux Programmer's Manual 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 || (_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED) 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 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 over‐ written by subsequent calls. This pointer must not be freed. On failure, NULL is returned. On success, ptsname_r() returns 0. On failure, a nonzero value is returned and errno is set 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). ┌────────────┬───────────────┬────────────────────────┐ │Interface │ Attribute │ Value │ ├────────────┼───────────────┼────────────────────────┤ │ptsname() │ Thread safety │ MT-Unsafe race:ptsname │ ├────────────┼───────────────┼────────────────────────┤ │ptsname_r() │ Thread safety │ MT-Safe │ └────────────┴───────────────┴────────────────────────┘


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 revi‐ sion 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)


This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at
2017-09-15 PTSNAME(3)
This manual Reference Other manuals
ptsname(3) referred by getpt(3) | grantpt(3) | gsm0710muxd(8) | ioctl_tty(2) | posix_openpt(2freebsd) | posix_openpt(3) | pts(4) | pts(4freebsd) | pty(7) | unlockpt(3)
refer to attributes(7) | feature_test_macros(7) | grantpt(3) | posix_openpt(3) | pts(4) | pty(7) | ttyname(3) | unlockpt(3)
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