GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
CentOS 5.5 |
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grantpt(3) |
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grantpt − grant access to the slave pseudo-terminal
#define
_XOPEN_SOURCE
#include <stdlib.h>
int grantpt(int fd);
The grantpt() function changes the mode and owner of the slave pseudo-terminal device (pty) corresponding to the master pty 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.
When successful, grantpt() returns 0. Otherwise, it returns −1 and sets errno appropriately.
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EACCES |
The corresponding slave pty could not be accessed. | ||
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EBADF |
The fd argument is not a valid open file descriptor. | ||
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EINVAL |
The fd argument is valid but not associated with a master pty. |
POSIX.1-2001
This is part of the Unix98 pty 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.
open(2), posix_openpt(3), ptsname(3), unlockpt(3), pts(4), pty(7)
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grantpt(3) | |