PTSNAME(3) Linux Programmer's Manual PTSNAME(3) NAME ptsname, ptsname_r - get the name of the slave pseudoterminal SYNOPSIS #define _XOPEN_SOURCE /* See feature_test_macros(7) */ #include <stdlib.h> char *ptsname(int fd); #define _GNU_SOURCE /* See feature_test_macros(7) */ #include <stdlib.h> int ptsname_r(int fd, char *buf, size_t buflen); DESCRIPTION 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-termi- nated string in the buffer pointed to by buf. The buflen argument specifies the number of bytes available in buf. RETURN VALUE 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, a nonzero value is returned and errno is set to indicate the error. ERRORS EINVAL (ptsname_r() only) buf is NULL. ENOTTY fd does not refer to a pseudoterminal master device. ERANGE (ptsname_r() only) buf is too small. VERSIONS ptsname() is provided in glibc since version 2.1. ATTRIBUTES Multithreading (see pthreads(7)) The ptsname() function is not thread-safe. The ptsname_r() function is thread-safe. CONFORMING TO ptsname() is part of the UNIX 98 pseudoterminal support (see pts(4)). This function is specified in POSIX.1-2001. ptsname_r() is a Linux extension. A version of this function is docu- mented on Tru64 and HP-UX, but on those implementations, -1 is returned on error, with errno set to indicate the error. Avoid using this func- tion in portable programs. SEE ALSO grantpt(3), posix_openpt(3), ttyname(3), unlockpt(3), pts(4), pty(7) COLOPHON This page is part of release 3.74 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 http://www.kernel.org/doc/man-pages/. 2013-06-21 PTSNAME(3)
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