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12 .TH SEM_UNLINK 3C "Feb 5, 2008"
14 sem_unlink \- remove a named semaphore
18 #include <semaphore.h>
20 \fBint\fR \fBsem_unlink\fR(\fBconst char *\fR\fIname\fR);
26 The \fBsem_unlink()\fR function removes the semaphore named by the string
27 \fIname\fR. If the semaphore named by \fIname\fR is currently referenced by
28 other processes, then \fBsem_unlink()\fR has no effect on the state of the
29 semaphore. If one or more processes have the semaphore open when
30 \fBsem_unlink()\fR is called, destruction of the semaphore is postponed until
31 all references to the semaphore have been destroyed by calls to
32 \fBsem_close\fR(3C), \fB_Exit\fR(2), or one of the \fBexec\fR functions (see
33 \fBexec\fR(2)) . Calls to \fBsem_open\fR(3C) to re-create or re-connect to the
34 semaphore refer to a new semaphore after \fBsem_unlink()\fR is called. The
35 \fBsem_unlink()\fR call does not block until all references have been
36 destroyed; it returns immediately.
40 Upon successful completion, \fBsem_unlink()\fR returns \fB0\fR. Otherwise, the
41 semaphore is not changed and the function returns a value of \fB\(mi1\fR and
42 sets \fBerrno\fR to indicate the error.
46 The \fBsem_unlink()\fR function will fail if:
53 Permission is denied to unlink the named semaphore.
59 \fB\fBENAMETOOLONG\fR \fR
62 The length of \fIname\fR string exceeds \fIPATH_MAX\fR, or a pathname component
63 is longer than \fINAME_MAX\fR while \fB_POSIX_NO_TRUNC\fR is in effect.
72 The named semaphore does not exist.
81 The \fBsem_unlink()\fR function is not supported by the system.
87 See \fBattributes\fR(5) for descriptions of the following attributes:
95 ATTRIBUTE TYPE ATTRIBUTE VALUE
97 Interface Stability Committed
101 Standard See \fBstandards\fR(5).
107 \fBexec\fR(2), \fBexit\fR(2), \fBsem_close\fR(3C), \fBsem_open\fR(3C),
108 \fBattributes\fR(5), \fBstandards\fR(5)
112 Solaris 2.6 was the first release to support the Asynchronous Input and Output
113 option. Prior to this release, this function always returned \fB\(mi1\fR and
114 set \fBerrno\fR to \fBENOSYS\fR.