-.\" Hey Emacs! This file is -*- nroff -*- source.
-.\"
.\" Copyright (C) 2002 Michael Kerrisk <mtk.manpages@gmail.com>
.\"
+.\" %%%LICENSE_START(VERBATIM)
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
+.\" %%%LICENSE_END
.\"
.\" FIXME . Add an example to this page
.TH SHM_OPEN 3 2009-02-25 "Linux" "Linux Programmer's Manual"
.SH NAME
-shm_open, shm_unlink \- Create/open or unlink POSIX shared memory objects
+shm_open, shm_unlink \- create/open or unlink POSIX shared memory objects
.SH SYNOPSIS
.B #include <sys/mman.h>
.br
(Symbolic definitions of these constants can be obtained by including
.IR <sys/stat.h> .)
.sp
-A new shared memory object initially has zero length \(em the size of the
+A new shared memory object initially has zero length\(emthe size of the
object can be set using
.BR ftruncate (2).
The newly allocated bytes of a shared memory
will fail (unless
.B O_CREAT
was specified, in which case a new, distinct object is created).
-.SH "RETURN VALUE"
+.SH RETURN VALUE
On success,
.BR shm_open ()
returns a nonnegative file descriptor.
that does not exist.
.SH VERSIONS
These functions are provided in glibc 2.2 and later.
-.SH "CONFORMING TO"
+.SH CONFORMING TO
POSIX.1-2001.
.LP
POSIX.1-2001 says that the group ownership of a newly created shared
memory object is set to either the calling process's effective group ID
or "a system default group ID".
-.SH "NOTES"
+.SH NOTES
.LP
POSIX leaves the behavior of the combination of
.B O_RDONLY
.B O_TRUNC
unspecified.
On Linux, this will successfully truncate an existing
-shared memory object \(em this may not be so on other UNIX systems.
+shared memory object\(emthis may not be so on other UNIX systems.
.LP
The POSIX shared memory object implementation on Linux 2.4 makes use
of a dedicated file system, which is normally
mounted under
.IR /dev/shm .
-.SH "SEE ALSO"
+.SH SEE ALSO
.BR close (2),
.BR fchmod (2),
.BR fchown (2),