GRANTPT(3) - man page online | library functions

Grant access to the slave pseudoterminal.

GRANTPT(3)                          Linux Programmer's Manual                          GRANTPT(3)

NAME grantpt - grant access to the slave pseudoterminal
SYNOPSIS #define _XOPEN_SOURCE /* See feature_test_macros(7) */ #include <stdlib.h> int grantpt(int fd);
DESCRIPTION The grantpt() function changes the mode and owner of the slave pseudoterminal device cor‐ responding to the master pseudoterminal referred to by fd. The user ID of the slave is set to the real UID of the calling process. The group ID is set to an unspecified value (e.g., tty). The mode of the slave is set to 0620 (crw--w----). The behavior of grantpt() is unspecified if a signal handler is installed to catch SIGCHLD signals.
RETURN VALUE When successful, grantpt() returns 0. Otherwise, it returns -1 and sets errno appropri‐ ately.
ERRORS EACCES The corresponding slave pseudoterminal could not be accessed. EBADF The fd argument is not a valid open file descriptor. EINVAL The fd argument is valid but not associated with a master pseudoterminal.
VERSIONS grantpt() is provided in glibc since version 2.1.
ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ┌──────────┬───────────────┬────────────────┐ │Interface │ Attribute │ Value │ ├──────────┼───────────────┼────────────────┤ │grantpt() │ Thread safety │ MT-Safe locale │ └──────────┴───────────────┴────────────────┘
NOTES This is part of the UNIX 98 pseudoterminal support, see pts(4). Many systems implement this function via a set-user-ID helper binary called "pt_chown". With Linux devpts no such helper binary is required.
SEE ALSO open(2), posix_openpt(3), ptsname(3), unlockpt(3), pts(4), pty(7)
COLOPHON This page is part of release 4.04 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
GNU 2015-08-08 GRANTPT(3)
This manual Reference Other manuals
grantpt(3) referred by getpt(3) | posix_openpt(2freebsd) | posix_openpt(3) | pts(4) | pts(4freebsd) | ptsname(3) | pty(7) | unlockpt(3)
refer to attributes(7) | feature_test_macros(7) | open(2) | posix_openpt(3) | pts(4) | ptsname(3) | pty(7) | unlockpt(3)