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-.\"	$Darwin$
-.\"
-.\" Copyright (c) 1999-2002 Apple Computer, Inc. All rights reserved.
-.\"
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-.\" 
-.\" The contents of this file constitute Original Code as defined in and
-.\" are subject to the Apple Public Source License Version 1.1 (the
-.\" "License").  You may not use this file except in compliance with the
-.\" License.  Please obtain a copy of the License at
-.\" http://www.apple.com/publicsource and read it before using this file.
-.\" 
-.\" This Original Code and all software distributed under the License are
-.\" distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
-.\" EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
-.\" INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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-.\" @APPLE_LICENSE_HEADER_END@
-.\"
-.Dd September 20, 1999
-.Dt SHM_OPEN 2
-.Os Darwin
-.Sh NAME
-.Nm shm_open
-.Nd open a shared memory object
-.Sh SYNOPSIS
-.Fd #include <sys/mman.h>
-.Ft int
-.Fn shm_open "const char *name" "int flags" "mode_t mode"
-.Sh DESCRIPTION
-The shared memory object referenced by
-.Fa name
-is opened for reading and/or writing as specified by the argument
-.Fa flags
-and the file descriptor returned to the calling process.
-The returned file descriptor will be the lowest non-open file
-descriptor for the calling process, and is not shared with any
-other processes, as it is a new file descriptor. The new file
-descriptor will have the
-.Dv FD_CLOEXEC
-flag set.
-Repeated calls
-to
-.Nm shm_open
-with the same string value for
-.Fn name
-will return a file descriptor referring to the same shared memory
-object, provided that the object has not been unlinked by a call to
-.Fn shm_unlink .
-The
-.Fa flags
-argument may indicate the file is to be
-created if it does not exist (by specifying the
-.Dv O_CREAT
-flag), in which case the file is created with mode
-.Fa mode
-as described in
-.Xr chmod 2
-and modified by the process' umask value (see
-.Xr umask 2 ) .
-.Pp
-The flags specified are formed by
-.Em or Ns 'ing
-the following values:
-.Pp
-.Bd -literal -offset indent -compact
-O_RDONLY	open for reading only
-O_RDWR		open for reading and writing
-O_CREAT		create object if it does not exist
-O_EXCL		error if create and object exists
-O_TRUNC		truncate size to 0
-.Ed
-.Pp
-Exactly one of
-.Dv O_RDONLY
-or
-.Dv O_RDWR
-must be specified.
-.Pp
-If
-.Dv O_TRUNC
-is specified and the
-file exists, the file is truncated to zero length.
-If
-.Dv O_EXCL
-is set with
-.Dv O_CREAT
-and the file already
-exists,
-.Fn shm_open
-returns an error.  This may be used to
-implement a simple exclusive access locking mechanism.
-.Pp
-If successful,
-.Fn shm_open
-returns a non-negative integer, termed a file descriptor.
-It returns -1 and sets
-.Va errno
-on failure.
-The file pointer used to mark the current position within the
-memory object is set to the beginning of the object.
-.Pp
-When a new shared memory object is created it is given the
-owner and group corresponding to the effective user and
-group of the calling process. There is no visible entry in the
-file system for the created object in this implementation.
-.Pp
-When a shared memory object is created, it persists until it
-it unlinked and all other references are gone. Objects do
-not persist across a system reboot.
-.Pp
-The new descriptor is set to remain open across
-.Xr execve
-system calls; see
-.Xr close 2
-and
-.Xr fcntl 2 .
-.Pp
-The system imposes a limit on the number of file descriptors
-open simultaneously by one process.
-.Xr Getdtablesize 2
-returns the current system limit.
-.Sh ERRORS
-The named object 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.
-.It Bq Er EACCES
-.Dv O_CREAT
-is specified, the object does not exist, and permission to
-create the object is denied.
-.It Bq Er EEXIST
-.Dv O_CREAT
-and
-.Dv O_EXCL
-were specified and the object exists.
-.It Bq Er EINTR
-The
-.Fn shm_open
-operation was interrupted by a signal.
-.It Bq Er EINVAL
-The
-.Fn shm_open
-operation is not supported.
-.It Bq Er EMFILE
-The process has already reached its limit for open file descriptors.
-.It Bq Er ENAMETOOLONG
-.Fa name
-exceeded
-.Dv SHM_NAME_MAX
-characters.
-.It Bq Er ENFILE
-The system file table is full.
-.It Bq Er ENOENT
-.Dv O_CREAT
-is not set and the named object 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 object.
-.El
-.Sh SEE ALSO
-.Xr chmod 2 ,
-.Xr close 2 ,
-.Xr getdtablesize 2 ,
-.Xr mmap 2 ,
-.Xr shm_unlink 2 ,
-.Xr umask 2
-.Sh HISTORY
-.Fn shm_open
-is specified in the POSIX Realtime Extension (1003.1b-1993/1003.1i-1995).