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+'\" et
+.TH SEM_INIT "3P" 2013 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+
+.SH NAME
+sem_init
+\(em initialize an unnamed semaphore
+.SH SYNOPSIS
+.LP
+.nf
+#include <semaphore.h>
+.P
+int sem_init(sem_t *\fIsem\fP, int \fIpshared\fP, unsigned \fIvalue\fP);
+.fi
+.SH DESCRIPTION
+The
+\fIsem_init\fR()
+function shall initialize the unnamed semaphore referred to by
+.IR sem .
+The value of the initialized semaphore shall be
+.IR value .
+Following a successful call to
+\fIsem_init\fR(),
+the semaphore may be used in subsequent calls to
+\fIsem_wait\fR(),
+\fIsem_timedwait\fR(),
+\fIsem_trywait\fR(),
+\fIsem_post\fR(),
+and
+\fIsem_destroy\fR().
+This semaphore shall remain usable until the semaphore is destroyed.
+.P
+If the
+.IR pshared
+argument has a non-zero value, then the semaphore is shared between
+processes; in this case, any process that can access the semaphore
+.IR sem
+can use
+.IR sem
+for performing
+\fIsem_wait\fR(),
+\fIsem_timedwait\fR(),
+\fIsem_trywait\fR(),
+\fIsem_post\fR(),
+and
+\fIsem_destroy\fR()
+operations.
+.P
+Only
+.IR sem
+itself may be used for performing synchronization. The result of
+referring to copies of
+.IR sem
+in calls to
+\fIsem_wait\fR(),
+\fIsem_timedwait\fR(),
+\fIsem_trywait\fR(),
+\fIsem_post\fR(),
+and
+\fIsem_destroy\fR()
+is undefined.
+.P
+If the
+.IR pshared
+argument is zero, then the semaphore is shared between threads of the
+process; any thread in this process can use
+.IR sem
+for performing
+\fIsem_wait\fR(),
+\fIsem_timedwait\fR(),
+\fIsem_trywait\fR(),
+\fIsem_post\fR(),
+and
+\fIsem_destroy\fR()
+operations. The use of the semaphore by threads other than those
+created in the same process is undefined.
+.P
+Attempting to initialize an already initialized semaphore results in
+undefined behavior.
+.SH "RETURN VALUE"
+Upon successful completion, the
+\fIsem_init\fR()
+function shall initialize the semaphore in
+.IR sem
+and return 0. Otherwise, it shall return \(mi1 and set
+.IR errno
+to indicate the error.
+.SH ERRORS
+The
+\fIsem_init\fR()
+function shall fail if:
+.TP
+.BR EINVAL
+The
+.IR value
+argument exceeds
+{SEM_VALUE_MAX}.
+.TP
+.BR ENOSPC
+A resource required to initialize the semaphore has been exhausted, or
+the limit on semaphores (\c
+{SEM_NSEMS_MAX})
+has been reached.
+.TP
+.BR EPERM
+The process lacks appropriate privileges to initialize the
+semaphore.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIsem_destroy\fR\^(\|)",
+.IR "\fIsem_post\fR\^(\|)",
+.IR "\fIsem_timedwait\fR\^(\|)",
+.IR "\fIsem_trywait\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2008,
+.IR "\fB<semaphore.h>\fP"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, Copyright (C) 2013 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.
+(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/online.html .
+
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .