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.TH SHM_UNLINK 3C "Feb 5, 2008"
.SH NAME
shm_unlink \- remove a shared memory object
.SH SYNOPSIS
.LP
.nf
#include <sys/mman.h>

\fBint\fR \fBshm_unlink\fR(\fBconst char *\fR\fIname\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBshm_unlink()\fR function removes the name of the shared memory object
named by the string pointed to by \fIname\fR. If one or more references to the
shared memory object exists when the object is unlinked, the name is removed
before \fBshm_unlink()\fR returns, but the removal of the memory object
contents will be postponed until all open and mapped references to the shared
memory object have been removed.
.SH RETURN VALUES
.sp
.LP
Upon successful completion, \fBshm_unlink()\fR returns \fB0\fR. Otherwise it
returns \fB\(mi1\fR and sets \fBerrno\fR to indicate the error condition, and
the named shared memory object is not affected by this function call.
.SH ERRORS
.sp
.LP
The  \fBshm_unlink()\fR function will fail if:
.sp
.ne 2
.na
\fB\fBEACCES\fR \fR
.ad
.RS 17n
Permission is denied to unlink the named shared memory object.
.RE

.sp
.ne 2
.na
\fB\fBENAMETOOLONG\fR \fR
.ad
.RS 17n
The length of the \fIname\fR string exceeds  \fBPATH_MAX\fR, or a pathname
component is longer than  \fINAME_MAX\fR while  \fB_POSIX_NO_TRUNC\fR is in
effect.
.RE

.sp
.ne 2
.na
\fB\fBENOENT\fR \fR
.ad
.RS 17n
The named shared memory object does not exist.
.RE

.sp
.ne 2
.na
\fB\fBENOSYS\fR \fR
.ad
.RS 17n
The \fBshm_unlink()\fR function is not supported by the system.
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Committed
_
MT-Level	MT-Safe
_
Standard	See \fBstandards\fR(5).
.TE

.SH SEE ALSO
.sp
.LP
\fBclose\fR(2), \fBmmap\fR(2), \fBmlock\fR(3C), \fBshm_open\fR(3C),
\fBattributes\fR(5), \fBstandards\fR(5)
.SH NOTES
.sp
.LP
Solaris 2.6 was the first release to support the Asynchronous Input and Output
option. Prior to this release, this function always returned \fB\(mi1\fR and
set \fBerrno\fR to \fBENOSYS\fR.