개요

• 솔라나라에 설명된 어플리케이션에 대해 맨 페이지를 찾아 출력한다.
• MAN 페이지에 대한 설명은 윈디하나의 솔라나라: MAN 페이지을 참고하자.
• svcadm(1M)을 검색하려면 섹션에서 1M 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.

semids(2)

semids(2)                        System Calls                        semids(2)



NAME
       semids - discover all semaphore identifiers

SYNOPSIS
       #include <sys/sem.h>

       int semids(int *buf, uint_t nids, uint_t *pnids);

DESCRIPTION
       The  semids() function copies all active semaphore identifiers from the
       system into the user-defined buffer specified by buf, provided that the
       number  of  such identifiers is not greater than the number of integers
       the buffer can contain, as specified by nids. If the size of the buffer
       is  insufficient  to contain all of the active semaphore identifiers in
       the system, none are copied.


       Whether or not the size of the buffer is sufficient to contain  all  of
       them,  the  number  of  active  semaphore  identifiers in the system is
       copied into the unsigned integer pointed to by pnids.


       If nids is 0 or less than the number of active semaphore identifiers in
       the system, buf is ignored.

RETURN VALUES
       Upon  successful  completion,  semids()  returns  0.  Otherwise,  −1 is
       returned and errno is set to indicate the error.

ERRORS
       The semids() function will fail if:

       EFAULT    The buf or pnids argument points to an illegal address.


USAGE
       The semids() function returns a snapshot of all  the  active  semaphore
       identifiers  in  the  system. More may be added and some may be removed
       before they can be used by the caller.

EXAMPLES
       Example 1 semids() example



       This is sample C code indicating how to use the semids() function.


         void
         examine_semids(void)
         {
              int *ids = NULL;
              uint_t nids = 0;
              uint_t n;
              int i;

              for (;;) {
                   if (semids(ids, nids, &n) != 0) {
                        perror("semids");
                        exit(1);
                   }
                   if (n <= nids)     /* we got them all */
                        break;
                   /* we need a bigger buffer */
                   ids = reallocarray(ids, n, sizeof (int));
                   if (ids == NULL) {
                        perror("reallocarray");
                        exit(1);
                   }
                   nids = n;
              }

              for (i = 0; i < n; i++)
                   process_semid(ids[i]);

              free(ids);
         }


ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:


       tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE  TYPEAT‐
       TRIBUTE  VALUE  _  Interface StabilityCommitted _ MT-LevelAsync-Signal-
       Safe


SEE ALSO
       ipcrm(1),   ipcs(1),   Intro(2),   semctl(2),   semget(2),    semop(2),
       attributes(7)

HISTORY
       The  semids()  function  was  added  to  Solaris in the Solaris 8 10/00
       (Update 2) release.



Oracle Solaris 11.4               25 Sep 2020                        semids(2)