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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
+.TH "<semaphore.h>" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" <semaphore.h>
+.SH NAME
+semaphore.h \- semaphores (\fBREALTIME\fP)
+.SH SYNOPSIS
+.LP
+\fB#include <semaphore.h> \fP
+.SH DESCRIPTION
+.LP
+The \fI<semaphore.h>\fP header shall define the \fBsem_t\fP type,
+used in performing semaphore operations. The semaphore
+may be implemented using a file descriptor, in which case applications
+are able to open up at least a total of {OPEN_MAX} files and
+semaphores. The symbol SEM_FAILED shall be defined (see \fIsem_open\fP()).
+.LP
+The following shall be declared as functions and may also be defined
+as macros. Function prototypes shall be provided.
+.sp
+.RS
+.nf
+
+\fBint sem_close(sem_t *);
+int sem_destroy(sem_t *);
+int sem_getvalue(sem_t *restrict, int *restrict);
+int sem_init(sem_t *, int, unsigned);
+sem_t *sem_open(const char *, int, ...);
+int sem_post(sem_t *);
+
+int sem_timedwait(sem_t *restrict, const struct timespec *restrict);
+
+int sem_trywait(sem_t *);
+int sem_unlink(const char *);
+int sem_wait(sem_t *);
+\fP
+.fi
+.RE
+.LP
+Inclusion of the \fI<semaphore.h>\fP header may make visible symbols
+defined in the headers \fI<fcntl.h>\fP and \fI<sys/types.h>\fP.
+.LP
+\fIThe following sections are informative.\fP
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fI<fcntl.h>\fP , \fI<sys/types.h>\fP , the System
+Interfaces volume of IEEE\ Std\ 1003.1-2001, \fIsem_destroy\fP(),
+\fIsem_getvalue\fP(), \fIsem_init\fP(), \fIsem_open\fP(), \fIsem_post\fP(),
+\fIsem_timedwait\fP(), \fIsem_trywait\fP(), \fIsem_unlink\fP(), \fIsem_wait\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 .