sem_init man page on FreeBSD

Man page or keyword search:  
man Server   9747 pages
apropos Keyword Search (all sections)
Output format
FreeBSD logo
[printable version]

SEM_INIT(3)		 BSD Library Functions Manual		   SEM_INIT(3)

     sem_init — initialize an unnamed semaphore

     Standard C Library (libc, -lc)

     #include <semaphore.h>

     sem_init(sem_t *sem, int pshared, unsigned int value);

     The sem_init() function initializes the unnamed semaphore pointed to by
     sem to have the value value.  A non-zero value for pshared specifies a
     shared semaphore that can be used by multiple processes, which this
     implementation is not capable of.

     Following a successful call to sem_init(), sem can be used as an argument
     in subsequent calls to sem_wait(3), sem_trywait(3), sem_post(3), and
     sem_destroy(3).  The sem argument is no longer valid after a successful
     call to sem_destroy(3).

     The sem_init() function returns the value 0 if successful; otherwise the
     value -1 is returned and the global variable errno is set to indicate the

     The sem_init() function will fail if:

     [EINVAL]		The value argument exceeds SEM_VALUE_MAX.

     [ENOSPC]		Memory allocation error.

     [EPERM]		Unable to initialize a shared semaphore.

     sem_destroy(3), sem_getvalue(3), sem_post(3), sem_trywait(3),
     sem_wait(3), sem(4)

     The sem_init() function conforms to ISO/IEC 9945-1:1996 (“POSIX.1”).

     This implementation does not support shared semaphores, and reports this
     fact by setting errno to EPERM.  This is perhaps a stretch of the inten‐
     tion of POSIX, but is compliant, with the caveat that sem_init() always
     reports a permissions error when an attempt to create a shared semaphore
     is made.

BSD			       February 15, 2000			   BSD

List of man pages available for FreeBSD

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
Vote for polarhome
Free Shell Accounts :: the biggest list on the net