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-.\"	$Darwin$
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-.\" are subject to the Apple Public Source License Version 1.1 (the
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-.\" License.  Please obtain a copy of the License at
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-.Dd June 8, 2000
-.Dt SEM_OPEN 2
-.Os Darwin
-.Sh NAME
-.Nm sem_open
-.Nd initialize and open a named semaphore
-.Sh SYNOPSIS
-.Fd #include <semaphore.h>
-.Ft sem_t *
-.Fn sem_open "const char *name" "int flags"
-.Ft sem_t *
-.Fn sem_open "const char *name" "int flags" "mode_t mode" "unsigned int value"
-.Sh DESCRIPTION
-The named semaphore named
-.Fa name
-is initialized and opened as specified by the argument
-.Fa flags
-and a semaphore descriptor is returned to the calling process.
-.Pp
-The flags specified are formed by
-.Em or Ns 'ing
-the following values:
-.Pp
-.Bd -literal -offset indent -compact
-O_CREAT		create the semaphore if it does not exist
-O_EXCL		error if create and semaphore exists
-.Ed
-.Pp
-If
-.Dv O_CREATE
-if specified,
-.Fn sem_open
-requires an additional two arguments.
-.Fa mode
-specifies the permissions for the semaphore as described in
-.Xr chmod 2
-and modified by the process' umask value (see
-.Xr umask 2 ) .
-The semaphore is created with an initial
-.Fa value ,
-which must be less than or equal to
-.Dv SEM_VALUE_MAX .
-.Pp
-If
-.Dv O_EXCL
-is specified and the semaphore exists,
-.Fn sem_open
-fails.  The check for the existence of the semaphore and the creation
-of the semaphore are atomic with respect to all processes calling
-.Fn sem_open
-with
-.Dv O_CREAT
-and
-.Dv O_EXCL
-set.
-.Pp
-When a new semaphore is created, it is given the user ID and group ID
-which coorespond to the effective user and group IDs of the calling
-process. There is no visible entry in the file system for the created
-object in this implementation.
-.Pp
-The returned semaphore descriptor is available to the calling process
-until it is closed with
-.Fn sem_close ,
-or until the caller exits or execs.
-.Pp
-If a process makes repeated calls to
-.Fn sem_open ,
-with the same
-.Fa name
-argument, the same descriptor is returned for each successful call,
-unless
-.Fn sem_unlink
-has been called on the semaphore in the interim.
-.Pp
-If
-.Fn sem_open
-fails for any reason, it will return a value of
-.Dv SEM_FAILED
-and sets
-.Va errno .
-On success, it returns a semaphore descriptor.
-.Sh ERRORS
-The named semaphore is opened unless:
-.Bl -tag -width Er
-.It Bq Er EACCES
-The required permissions (for reading and/or writing)
-are denied for the given flags; or
-.Dv O_CREAT
-is specified, the object does not exist, and permission to
-create the semaphore is denied.
-.It Bq Er EEXIST
-.Dv O_CREAT
-and
-.Dv O_EXCL
-were specified and the semaphore exists.
-.It Bq Er EINTR
-The
-.Fn sem_open
-operation was interrupted by a signal.
-.It Bq Er EINVAL
-The
-.Fn shm_open
-operation is not supported; or
-.Dv O_CREAT
-is specified and
-.Fa value
-exceeds
-.Dv SEM_VALUE_MAX .
-.It Bq Er EMFILE
-The process has already reached its limit for semaphores or file
-descriptors in use.
-.It Bq Er ENAMETOOLONG
-.Fa name
-exceeded
-.Dv SEM_NAME_LEN
-characters.
-.It Bq Er ENFILE
-Too many semaphores or file descriptors are open on the system.
-.It Bq Er ENOENT
-.Dv O_CREAT
-is not set and the named semaphore does not exist.
-.It Bq Er ENOSPC
-.Dv O_CREAT
-is specified, the file does not exist, and there is insufficient
-space available to create the semaphore.
-.El
-.Sh SEE ALSO
-.Xr semctl 2 ,
-.Xr semget 2 ,
-.Xr semop 2 ,
-.Xr sem_close 2 ,
-.Xr sem_post 2 ,
-.Xr sem_trywait 2 ,
-.Xr sem_unlink 2 ,
-.Xr sem_wait 2 ,
-.Xr umask 2
-.Sh HISTORY
-.Fn sem_open
-is specified in the POSIX Realtime Extension (1003.1b-1993/1003.1i-1995).