NAME
grantpt - grant access to the slave pseudoterminal SYNOPSIS
#define XOPENSOURCE /* See featuretestmacros(7) */
#include
int grantpt(int fd); DESCRIPTION The grantpt() function changes the mode and owner of the slave pseu‐ doterminal device corresponding to the master pseudoterminal referred to by fd. The user ID of the slave is set to the real UID of the call‐ ing process. The group ID is set to an unspecified value (e.g., tty). The mode of the slave is set to 0620 (crww). 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 appropriately. 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 pseu‐ doterminal. 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 │ └──────────┴───────────────┴────────────────┘ CONFORMING TO
POSIX.1-2001. 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 "ptchown". With Linux devpts no such helper binary is required. SEE ALSO open(2), posixopenpt(3), ptsname(3), unlockpt(3), pts(4), pty(7) COLOPHON
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be found at http://www.kernel.org/doc/man-pages/.
GNU 2008-06-14 GRANTPT(3)