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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "SEM_GETVALUE" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" sem_getvalue 
+.SH NAME
+sem_getvalue \- get the value of a semaphore (\fBREALTIME\fP)
+.SH SYNOPSIS
+.LP
+\fB#include <semaphore.h>
+.br
+.sp
+int sem_getvalue(sem_t *restrict\fP \fIsem\fP\fB, int *restrict\fP
+\fIsval\fP\fB); \fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIsem_getvalue\fP() function shall update the location referenced
+by the \fIsval\fP argument to have the value of the
+semaphore referenced by \fIsem\fP without affecting the state of the
+semaphore. The updated value represents an actual semaphore
+value that occurred at some unspecified time during the call, but
+it need not be the actual value of the semaphore when it is
+returned to the calling process.
+.LP
+If \fIsem\fP is locked, then the object to which \fIsval\fP points
+shall either be set to zero or to a negative number whose
+absolute value represents the number of processes waiting for the
+semaphore at some unspecified time during the call.
+.SH RETURN VALUE
+.LP
+Upon successful completion, the \fIsem_getvalue\fP() function shall
+return a value of zero. Otherwise, it shall return a value
+of -1 and set \fIerrno\fP to indicate the error.
+.SH ERRORS
+.LP
+The \fIsem_getvalue\fP() function shall fail if:
+.TP 7
+.B EINVAL
+The \fIsem\fP argument does not refer to a valid semaphore.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+The \fIsem_getvalue\fP() function is part of the Semaphores option
+and need not be available on all implementations.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIsemctl\fP() , \fIsemget\fP() , \fIsemop\fP()
+, \fIsem_post\fP() , \fIsem_timedwait\fP() , \fIsem_trywait\fP() ,
+\fIsem_wait\fP() , the Base Definitions volume of
+IEEE\ Std\ 1003.1-2001, \fI<semaphore.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .