2004-11-03 13:51:07 +00:00
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.\" Hey Emacs! This file is -*- nroff -*- source.
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.\" This page is in the public domain. - aeb
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.\"
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2008-06-11 13:43:34 +00:00
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.TH GRANTPT 3 2008-06-14 "GNU" "Linux Programmer's Manual"
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2004-11-03 13:51:07 +00:00
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.SH NAME
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grantpt \- grant access to the slave pseudoterminal
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2004-11-03 13:51:07 +00:00
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.SH SYNOPSIS
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.nf
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getresuid.2, mremap.2, poll.2, remap_file_pages.2, setresuid.2, splice.2, sync_file_range.2, syscall.2, tee.2, vmsplice.2, INFINITY.3, aio_init.3, asprintf.3, assert_perror.3, basename.3, bsd_signal.3, canonicalize_file_name.3, clog10.3, crypt.3, dl_iterate_phdr.3, dlopen.3, encrypt.3, exp10.3, fcloseall.3, fenv.3, fopencookie.3, ftw.3, getaddrinfo_a.3, getloadavg.3, getutent.3, grantpt.3, hsearch.3, lseek64.3, memmem.3, mempcpy.3, pow10.3, program_invocation_name.3, ptsname.3, putgrent.3, sched_getcpu.3, sincos.3, strchr.3, strfry.3, strnlen.3, strptime.3, strstr.3, strverscmp.3, swab.3, sysv_signal.3, tsearch.3, unlockpt.3, wcwidth.3: Add reference to feature_test_macros(7)
Some pages simply list feature test macro requirements in
the form:
#define #GNU_SOURCE
#include <someheader.h>
For these pages, add a "See feature_test_macros(7)" comment
on the "#define" line.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-10-31 04:31:47 +00:00
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.BR "#define _XOPEN_SOURCE" " /* See feature_test_macros(7) */"
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2004-11-03 13:51:07 +00:00
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.br
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.B #include <stdlib.h>
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.sp
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.BI "int grantpt(int " fd ");"
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.fi
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.SH DESCRIPTION
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The
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.BR grantpt ()
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function changes the mode and owner of the slave pseudoterminal device
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corresponding to the master pseudoterminal referred to by
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.IR fd .
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The user ID of the slave is set to the real UID of the calling process.
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2007-12-24 15:08:20 +00:00
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The group ID is set to an unspecified value (e.g., \fItty\fP).
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The mode of the slave is set to 0620 (crw\-\-w\-\-\-\-).
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.PP
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The behavior of
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.BR grantpt ()
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2007-06-21 05:38:48 +00:00
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is unspecified if a signal handler is installed to catch
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.B SIGCHLD
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signals.
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.SH "RETURN VALUE"
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2007-04-12 22:42:49 +00:00
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When successful,
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.BR grantpt ()
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2007-06-08 03:17:37 +00:00
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returns 0.
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Otherwise, it returns \-1 and sets
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.I errno
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appropriately.
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.SH ERRORS
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.TP
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.B EACCES
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The corresponding slave pseudoterminal could not be accessed.
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.TP
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.B EBADF
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The
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.I fd
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argument is not a valid open file descriptor.
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.TP
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.B EINVAL
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The
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.I fd
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argument is valid but not associated with a master pseudoterminal.
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.SH VERSIONS
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.BR grantpt ()
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is provided in glibc since version 2.1.
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.SH "CONFORMING TO"
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2008-07-15 13:39:17 +00:00
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POSIX.1-2001.
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.SH NOTES
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2010-10-12 04:55:18 +00:00
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This is part of the UNIX 98 pseudoterminal support, see
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.BR pts (4).
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2005-07-18 14:25:42 +00:00
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Many systems implement this function via a set-user-ID helper binary
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2007-06-08 11:25:04 +00:00
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called "pt_chown".
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With Linux devpts no such helper binary is required.
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.SH "SEE ALSO"
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.BR open (2),
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2004-12-17 12:46:00 +00:00
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.BR posix_openpt (3),
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.BR ptsname (3),
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.BR unlockpt (3),
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2005-10-10 13:14:12 +00:00
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.BR pts (4),
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.BR pty (7)
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