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.\" Copyright (c) 2000, 2020, Oracle and/or its affiliates.
.TH semids 2 "25 Sep 2020" "Oracle Solaris 11.4" "System Calls"
.SH NAME
semids \- discover all
semaphore identifiers
.SH SYNOPSIS

.LP
.nf
#include <sys/sem.h>

\fBint\fR \fBsemids\fR(\fBint *\fR\fIbuf\fR, \fBuint_t\fR \fInids\fR, \fBuint_t *\fR\fIpnids\fR);
.fi
.SH DESCRIPTION
.sp
.LP
The \fBsemids()\fR function copies all active semaphore identifiers from the system into the user-defined buffer specified by \fIbuf\fR, provided that the number of such identifiers is not greater than the number of integers the buffer can contain, as specified by \fInids\fR. If the size of the buffer is insufficient to contain all of the active semaphore identifiers in the system, none are copied.
.sp
.LP
Whether or not the size of the buffer is sufficient to contain all of them, the number of active semaphore identifiers in the system is copied into the unsigned integer pointed to by \fIpnids\fR.
.sp
.LP
If \fInids\fR is 0 or less than the number of active semaphore identifiers in the system, \fIbuf\fR is ignored.
.SH RETURN VALUES
.sp
.LP
Upon successful completion, \fBsemids()\fR returns \fB0\fR. Otherwise, \fB\(mi1\fR is returned and \fBerrno\fR is set to indicate the error.
.SH ERRORS
.sp
.LP
The \fBsemids()\fR function will fail if:
.sp
.ne 2
.mk
.na
\fB\fBEFAULT\fR\fR
.ad
.RS 10n
.rt
The \fIbuf\fR or \fIpnids\fR argument points to an illegal address.
.RE

.SH USAGE
.sp
.LP
The \fBsemids()\fR function returns a snapshot of all the active semaphore identifiers in the system. More may be added and some may be removed before they can be used by the caller.
.SH EXAMPLES
.LP
\fBExample 1\fR \fBsemids()\fR example

.sp
.LP
This is sample C code indicating how to use the \fBsemids()\fR function.

.sp
.in +2
.nf
void
examine_semids(void)
{
     int *ids = NULL;
     uint_t nids = 0;
     uint_t n;
     int i;

for (;;) {
          if (semids(ids, nids, &n) != 0) {
               perror("semids");
               exit(1);
          }
          if (n <= nids)     /* we got them all */
               break;
          /* we need a bigger buffer */
          ids = reallocarray(ids, n, sizeof (int));
          if (ids == NULL) {
               perror("reallocarray");
               exit(1);
          }
          nids = n;
     }

for (i = 0; i < n; i++)
          process_semid(ids[i]);

free(ids);
}
.fi
.in -2
.sp
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp
.TS
tab(
) box;
cw(2.75i) |cw(2.75i) 
lw(2.75i) |lw(2.75i) 
.
ATTRIBUTE TYPE
ATTRIBUTE VALUE
_
Interface Stability
Committed
_
MT-Level
Async-Signal-Safe
.TE
.sp
.SH SEE ALSO
.sp
.LP
\fBipcrm\fR(1), \fBipcs\fR(1), \fBIntro\fR(2), \fBsemctl\fR(2), \fBsemget\fR(2), \fBsemop\fR(2), \fBattributes\fR(7)
.SH HISTORY
.sp
.LP
The \fBsemids()\fR function was added to Solaris in the Solaris 8 10/00 (Update 2) release.