115 lines
3.2 KiB
C
115 lines
3.2 KiB
C
/****************************************************************
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* *
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* Copyright 2001, 2009 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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/* semstat2.c - display more information about semaphores (than semstat did)
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*
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* semval - current value of the semaphore
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* semncnt - count of processes waiting for the semaphore value to
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* become greater than its current value.
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* semzcnt - count of processes waiting for the semaphore value to
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* become zero.
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* sempid - last process id to perform an operation on the
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* semaphore.
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*
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* Usage: semstat2 <semid1> <semid2> ... <semidn>
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*/
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#include "main_pragma.h"
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#include <errno.h>
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#include <sys/types.h>
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#include "gtm_ipc.h"
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#include <sys/sem.h>
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#include "gtm_sem.h"
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#include "gtm_stdlib.h"
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#include "gtm_stdio.h"
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static void usage (char *prog);
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static void usage (char *prog)
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{
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FPRINTF(stderr, "%s: Report information about semaphores\n", prog);
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FPRINTF(stderr, "\nUsage-\n");
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FPRINTF(stderr, "\t%s <semid1> <semid2> ... <semidn>\n\n", prog);
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FPRINTF(stderr, "information returned for each semaphore in set:\n");
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FPRINTF(stderr, "\tsemval\t\tcurrent value of semaphore\n");
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FPRINTF(stderr, "\tsemncnt\t\t# of procs waiting for semval to increase\n");
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FPRINTF(stderr, "\tsemzcnt\t\t# of procs waiting for semval to become zero\n");
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FPRINTF(stderr, "\tsempid\t\tPID of last proc performing operation on semaphore\n");
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}
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int main (int argc, char *argv[])
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{
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int i, j;
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char s[81];
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int sem, semval, semncnt, semzcnt, sempid;
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struct sembuf sop;
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struct semid_ds semstat;
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union semun semarg;
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if (argc == 1)
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{
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usage(argv[0]);
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exit(1);
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}
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semarg.buf = &semstat;
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for(i=1; i< argc; i++)
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{
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sem = ATOI(argv[i]);
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if ( semctl(sem, 0, IPC_STAT, semarg) == -1 )
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{
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FPRINTF(stderr, "Error obtaining semaphore status.\n");
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SPRINTF(s, "semctl(%d)", sem);
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PERROR(s);
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continue;
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}
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PRINTF("semid %d: %hu semaphores in the set\n", sem, (unsigned short int)semarg.buf->sem_nsems);
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for(j=0; j < semarg.buf->sem_nsems; j++)
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{
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if ( (semval = semctl(sem, j, GETVAL)) == -1 )
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{
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FPRINTF(stderr, "Error obtaining semaphore %d value.\n", j);
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SPRINTF(s, "semctl(%d)", sem);
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PERROR(s);
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continue;
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}
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PRINTF("sem %d: (semval=%d, ", j, semval);
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if ( (semncnt = semctl(sem, j, GETNCNT)) == -1 )
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{
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FPRINTF(stderr, "\nError obtaining semaphore %d ncnt.\n", j);
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SPRINTF(s, "semctl(%d)", sem);
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PERROR(s);
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continue;
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}
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PRINTF("semncnt=%d, ", semncnt);
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if ( (semzcnt = semctl(sem, j, GETZCNT)) == -1 )
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{
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FPRINTF(stderr, "\nError obtaining semaphore %d zcnt.\n", j);
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SPRINTF(s, "semctl(%d)", sem);
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PERROR(s);
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continue;
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}
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PRINTF("semzcnt=%d, ", semzcnt);
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if ( (sempid= semctl(sem, j, GETPID)) == -1 )
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{
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FPRINTF(stderr, "\nError obtaining semaphore %d PID.\n", j);
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SPRINTF(s, "semctl(%d)", sem);
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PERROR(s);
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continue;
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}
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PRINTF("sempid=%d)\n", sempid);
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}
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}
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exit(0);
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}
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