freebsd-dev/lib/libc/gen/sem_open.3

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.\" Copyright (C) 2000 Jason Evans <jasone@freebsd.org>.
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.\" $FreeBSD$
.Dd February 15, 2000
.Dt SEM_OPEN 3
.Os
.Sh NAME
.Nm sem_open ,
.Nm sem_close ,
.Nm sem_unlink
.Nd named semaphore operations
.Sh LIBRARY
.Lb libc_r
.Sh SYNOPSIS
.Fd #include <semaphore.h>
.Ft sem_t *
.Fn sem_open "const char *name" "int oflag" "..."
.Ft int
.Fn sem_close "sem_t *sem"
.Ft int
.Fn sem_unlink "const char *name"
.Sh DESCRIPTION
The
.Fn sem_open ,
.Fn sem_close ,
and
.Fn sem_unlink
functions are not supported by this implementation.
.Sh RETURN VALUES
.Fn sem_open
returns SEM_FAILED and sets
.Va errno
to indicate an error.
.Fn sem_close
and
.Fn sem_unlink
return -1 and set
.Va errno
to indicate an error.
.Sh ERRORS
.Fn sem_open ,
.Fn sem_close ,
and
.Fn sem_unlink
will fail:
.Bl -tag -width Er
.It Bq Er ENOSYS
Function not supported by this implementation.
.El
.Sh STANDARDS
.Fn sem_open ,
.Fn sem_close ,
and
.Fn sem_unlink
conform to ISO/IEC 9945-1 ANSI/IEEE
.Pq Dq Tn POSIX
Std 1003.1 1996 Edition.