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_KSEM(2)                      System Calls Manual                     _KSEM(2)

NAME
     _ksem, _ksem_init, _ksem_open, _ksem_close, _ksem_unlink, _ksem_destroy,
     _ksem_getvalue, _ksem_post, _ksem_wait, _ksem_timedwait, _ksem_trywait -
     back-end implementation for POSIX semaphores

SYNOPSIS
     #include <sys/ksem.h>

     int
     _ksem_init(int value, intptr_t *idp);

     int
     _ksem_open(const char *name, int oflag, mode_t mode, unsigned int value,
         intptr_t *idp);

     int
     _ksem_close(intptr_t id);

     int
     _ksem_unlink(const char *name);

     int
     _ksem_destroy(intptr_t id);

     int
     _ksem_getvalue(intptr_t id, unsigned int *value);

     int
     _ksem_post(intptr_t id);

     int
     _ksem_wait(intptr_t id);

     int
     _ksem_timedwait(intptr_t id, const struct timespec *abstime);

     int
     _ksem_trywait(intptr_t id);

DESCRIPTION
     The _ksem_*() family of system calls provide the kernel implementation of
     POSIX semaphores.

RETURN VALUES
     Successful calls to the _ksem_*() system calls return a value of zero.
     Otherwise, -1 is returned and errno is set to provide more information.

ERRORS
     Please see the section 3 manual pages for specific error information.

SEE ALSO
     sem_close(3), sem_destroy(3), sem_getvalue(3), sem_init(3), sem_open(3),
     sem_post(3), sem_unlink(3), sem_wait(3), sem(4)

HISTORY
     Most of the _ksem_*() system calls first appeared in NetBSD 2.0.  The
     _ksem_timedwait() system call first appeared in NetBSD 5.0.

NetBSD 10.99                   November 30, 2015                  NetBSD 10.99