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-'\" t
-.\" Copyright (C) 2006 Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH sem_open 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-sem_open \- initialize and open a named semaphore
-.SH LIBRARY
-POSIX threads library
-.RI ( libpthread ", " \-lpthread )
-.SH SYNOPSIS
-.nf
-.BR "#include <fcntl.h>" "           /* For O_* constants */"
-.BR "#include <sys/stat.h>" "        /* For mode constants */"
-.B #include <semaphore.h>
-.PP
-.BI "sem_t *sem_open(const char *" name ", int " oflag );
-.BI "sem_t *sem_open(const char *" name ", int " oflag ,
-.BI "                mode_t " mode ", unsigned int " value );
-.fi
-.SH DESCRIPTION
-.BR sem_open ()
-creates a new POSIX semaphore or opens an existing semaphore.
-The semaphore is identified by
-.IR name .
-For details of the construction of
-.IR name ,
-see
-.BR sem_overview (7).
-.PP
-The
-.I oflag
-argument specifies flags that control the operation of the call.
-(Definitions of the flags values can be obtained by including
-.IR <fcntl.h> .)
-If
-.B O_CREAT
-is specified in
-.IR oflag ,
-then the semaphore is created if
-it does not already exist.
-The owner (user ID) of the semaphore is set to the effective
-user ID of the calling process.
-The group ownership (group ID) is set to the effective group ID
-of the calling process.
-.\" In reality the filesystem IDs are used on Linux.
-If both
-.B O_CREAT
-and
-.B O_EXCL
-are specified in
-.IR oflag ,
-then an error is returned if a semaphore with the given
-.I name
-already exists.
-.PP
-If
-.B O_CREAT
-is specified in
-.IR oflag ,
-then two additional arguments must be supplied.
-The
-.I mode
-argument specifies the permissions to be placed on the new semaphore,
-as for
-.BR open (2).
-(Symbolic definitions for the permissions bits can be obtained by including
-.IR <sys/stat.h> .)
-The permissions settings are masked against the process umask.
-Both read and write permission should be granted to each class of
-user that will access the semaphore.
-The
-.I value
-argument specifies the initial value for the new semaphore.
-If
-.B O_CREAT
-is specified, and a semaphore with the given
-.I name
-already exists, then
-.I mode
-and
-.I value
-are ignored.
-.SH RETURN VALUE
-On success,
-.BR sem_open ()
-returns the address of the new semaphore;
-this address is used when calling other semaphore-related functions.
-On error,
-.BR sem_open ()
-returns
-.BR SEM_FAILED ,
-with
-.I errno
-set to indicate the error.
-.SH ERRORS
-.TP
-.B EACCES
-The semaphore exists, but the caller does not have permission to
-open it.
-.TP
-.B EEXIST
-Both
-.B O_CREAT
-and
-.B O_EXCL
-were specified in
-.IR oflag ,
-but a semaphore with this
-.I name
-already exists.
-.TP
-.B EINVAL
-.I value
-was greater than
-.BR SEM_VALUE_MAX .
-.TP
-.B EINVAL
-.I name
-consists of just "/", followed by no other characters.
-.TP
-.B EMFILE
-The per-process limit on the number of open file descriptors has been reached.
-.TP
-.B ENAMETOOLONG
-.I name
-was too long.
-.TP
-.B ENFILE
-The system-wide limit on the total number of open files has been reached.
-.TP
-.B ENOENT
-The
-.B O_CREAT
-flag was not specified in
-.I oflag
-and no semaphore with this
-.I name
-exists;
-or,
-.\" this error can occur if we have a name of the (nonportable) form
-.\" /dir/name, and the directory /dev/shm/dir does not exist.
-.B O_CREAT
-was specified, but
-.I name
-wasn't well formed.
-.TP
-.B ENOMEM
-Insufficient memory.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.ad l
-.nh
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.BR sem_open ()
-T}	Thread safety	MT-Safe
-.TE
-.hy
-.ad
-.sp 1
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001.
-.SH SEE ALSO
-.BR sem_close (3),
-.BR sem_getvalue (3),
-.BR sem_post (3),
-.BR sem_unlink (3),
-.BR sem_wait (3),
-.BR sem_overview (7)