1 .\" Hey Emacs! This file is -*- nroff -*- source.
2 .\" This page is in the public domain. - aeb
4 .TH GRANTPT 3 "2003-01-30" "PTY Control" "Linux Programmer's Manual"
6 grantpt \- grant access to the slave pseudo-terminal
9 .B #define _XOPEN_SOURCE
11 .B #include <stdlib.h>
13 .BI "int grantpt(int " fd ");"
18 function changes the mode and owner of the slave pseudo-terminal device
19 (pty) corresponding to the master pty referred to by
21 The user ID of the slave is set to the real UID of the calling process.
22 The group ID is set to an unspecified value (e.g. tty).
23 The mode of the slave is set to 0620 (crw\-\-w\-\-\-\-).
27 is unspecified if a signal handler is installed to catch SIGCHLD signals.
31 returns 0. Otherwise, it returns \-1 and sets
37 The corresponding slave pty could not be accessed.
42 argument is not a valid open file descriptor.
47 argument is valid but not associated with a master pty.
51 This is part of the Unix98 pty support, see
53 Many systems implement this function via a set-user-ID helper binary
54 called "pt_chown". With Linux devpts no such helper binary is required.