IPC_INIT_IDS(9) Kernel IPC facilities IPC_INIT_IDS(9)NAME
ipc_init_ids - initialise IPC identifiers
SYNOPSIS
void ipc_init_ids(struct ipc_ids * ids);
ARGUMENTS
ids
Identifier set
DESCRIPTION
Set up the sequence range to use for the ipc identifier range (limited below IPCMNI) then initialise the ids idr.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 IPC_INIT_IDS(9)
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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()
{
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 = realloc(ids, (nids = n) * sizeof (int));
}
for (i = 0; i < n; i++)
process_semid(ids[i]);
free(ids);
}
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|MT-Level |Async-Signal-Safe |
+-----------------------------+-----------------------------+
SEE ALSO ipcrm(1), ipcs(1), Intro(2), semctl(2), semget(2), semop(2), attributes(5)SunOS 5.11 8 Mar 2000 semids(2)
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