Add a System V -style ipc status monitor. Implemented by Daniel Boulet
<danny@BouletFermat.ab.ca> Needs a man page, and *much* cleanup.
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# $Id: Makefile,v 1.1 1993/11/14 16:17:55 cgd Exp $
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PROG= ipcs
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NOMAN=
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.include <bsd.prog.mk>
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@ -0,0 +1,374 @@
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/*
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* Simplified implementation of SYSV ipcs.
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*
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* $Id: ipcs.c,v 1.1 1993/11/14 16:17:58 cgd Exp $
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*/
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#include <nlist.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <paths.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/proc.h>
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#define KERNEL
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#include <sys/ipc.h>
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#include <sys/sem.h>
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#include <sys/shm.h>
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#include <sys/msg.h>
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static kmem_fd;
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getsymbol(struct nlist * symbols, char *symname, void *dptr, int len)
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{
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int i, rlen;
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for (i = 0; symbols[i].n_name != NULL; i += 1) {
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if (strcmp(symbols[i].n_name, symname) == 0) {
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break;
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}
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}
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if (symbols[i].n_name == NULL) {
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fprintf(stderr,
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"ipcs(getsymbol): symbol %s not in local symbols list\n",
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symname);
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exit(1);
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}
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if (symbols[i].n_value == NULL) {
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fprintf(stderr, "ipcs(getsymbol): symbol %s not in %s\n",
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symname, _PATH_UNIX);
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return (0);
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}
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if (kmem_fd == 0) {
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kmem_fd = open("/dev/kmem", 0);
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if (kmem_fd < 0) {
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perror("ipcs(getsymbol(open /dev/kmem))");
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exit(1);
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}
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}
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lseek(kmem_fd, symbols[i].n_value, SEEK_SET);
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if ((rlen = read(kmem_fd, dptr, len)) != len) {
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fprintf(stderr,
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"ipcs(getsymbol): can't fetch symbol %s from /dev/kmem\n",
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symname);
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exit(1);
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}
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return (1);
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}
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void
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getlocation(void *addr, void *dptr, int len)
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{
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int i, rlen;
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if (kmem_fd == 0) {
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kmem_fd = open("/dev/kmem", 0);
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if (kmem_fd < 0) {
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perror("ipcs(getlocation(open /dev/kmem))");
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exit(1);
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}
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}
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lseek(kmem_fd, (long) addr, SEEK_SET);
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if ((rlen = read(kmem_fd, dptr, len)) != len) {
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fprintf(stderr,"ipcs(getlocation): can't fetch location %08x from /dev/kmem\n",
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addr);
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exit(1);
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}
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}
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char *
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fmt_perm(ushort mode)
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{
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static char buffer[100];
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buffer[0] = '-';
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buffer[1] = '-';
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buffer[2] = ((mode & 0400) ? 'r' : '-');
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buffer[3] = ((mode & 0200) ? 'w' : '-');
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buffer[4] = ((mode & 0100) ? 'a' : '-');
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buffer[5] = ((mode & 0040) ? 'r' : '-');
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buffer[6] = ((mode & 0020) ? 'w' : '-');
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buffer[7] = ((mode & 0010) ? 'a' : '-');
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buffer[8] = ((mode & 0004) ? 'r' : '-');
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buffer[9] = ((mode & 0002) ? 'w' : '-');
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buffer[10] = ((mode & 0001) ? 'a' : '-');
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buffer[11] = '\0';
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return (&buffer[0]);
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}
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void
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cvt_time(time_t t, char *buf)
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{
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struct tm tms;
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static char *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
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if (t == 0) {
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strcpy(buf, "<not set>");
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}
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else {
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tms = *localtime(&t);
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if (t > time(0) - 6 * 30 * 24 * 3600) { /* less than about 6
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months ago? */
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sprintf(buf, "%s %2d %2d:%2d",
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months[tms.tm_mon], tms.tm_mday, tms.tm_hour,
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tms.tm_min);
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}
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else {
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sprintf(buf, "%s %2d %5d",
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months[tms.tm_mon], tms.tm_mday,
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tms.tm_year + 1900);
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}
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}
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}
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main()
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{
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static struct nlist symbols[] = {
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{"_sema"},
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{"_seminfo"},
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{"_semu"},
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{"_msginfo"},
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{"_msqids"},
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{NULL}
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};
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int i;
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int show_sem_values = 1;
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int show_undo_values = 1;
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switch (nlist(_PATH_UNIX, &symbols[0])) {
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case 0:
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break;
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case -1:
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fprintf(stderr, "ipcs: can't open %s - bye!\n", _PATH_UNIX);
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exit(1);
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default:
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fprintf(stderr, "ipcs: nlist failed\n");
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for (i = 0; symbols[i].n_name != NULL; i += 1) {
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if (symbols[i].n_value == 0) {
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fprintf(stderr, "\tsymbol %s not found\n",
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symbols[i].n_name);
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}
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}
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break;
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}
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#ifdef notdef
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for ( i = 0; symbols[i].n_name != NULL; i += 1 ) {
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fprintf(stderr,"\t%s : %08x\n",symbols[i].n_name,
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symbols[i].n_value);
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}
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#endif
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if (getsymbol(symbols, "_seminfo", &seminfo, sizeof(seminfo))) {
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struct semid_ds *xsema;
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printf("seminfo:\n");
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printf("\tsemmap: %6d\t(# of entries in semaphore map)\n",
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seminfo.semmap);
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printf("\tsemmni: %6d\t(# of semaphore identifiers)\n",
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seminfo.semmni);
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printf("\tsemmns: %6d\t(# of semaphores in system)\n",
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seminfo.semmns);
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printf("\tsemmnu: %6d\t(# of undo structures in system)\n",
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seminfo.semmnu);
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printf("\tsemmsl: %6d\t(max # of semaphores per id)\n",
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seminfo.semmsl);
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printf("\tsemopm: %6d\t(max # of operations per semop call)\n",
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seminfo.semopm);
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printf("\tsemume: %6d\t(max # of undo entries per process)\n",
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seminfo.semume);
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printf("\tsemusz: %6d\t(size in bytes of undo structure)\n",
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seminfo.semusz);
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printf("\tsemvmx: %6d\t(semaphore maximum value)\n",
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seminfo.semvmx);
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printf("\tsemaem: %6d\t(adjust on exit max value)\n",
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seminfo.semaem);
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/*
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* Lock out other users of the semaphore facility
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*/
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if (semconfig(SEM_CONFIG_FREEZE) != 0) {
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perror("semconfig");
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fprintf(stderr,
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"Can't lock semaphore facility - winging it...\n");
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}
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getsymbol(symbols, "_sema", &sema, sizeof(sema));
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xsema = malloc(sizeof(struct semid_ds) * seminfo.semmni);
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getlocation(sema, xsema, sizeof(struct semid_ds) *
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seminfo.semmni);
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for (i = 0; i < seminfo.semmni; i += 1) {
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if ((xsema[i].sem_perm.mode & SEM_ALLOC) != 0) {
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char ctime_buf[100], otime_buf[100];
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struct semid_ds *semaptr = &xsema[i];
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cvt_time(semaptr->sem_ctime, ctime_buf);
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cvt_time(semaptr->sem_otime, otime_buf);
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printf("\nsema id: %d key: 0x%08x:\n",
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IXSEQ_TO_IPCID(i, semaptr->sem_perm),
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semaptr->sem_perm.key);
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printf(" cuid: %6d cgid: %6d ctime: %s\n",
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semaptr->sem_perm.cuid,
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semaptr->sem_perm.cgid, ctime_buf);
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printf(" uid: %6d gid: %6d otime: %s\n",
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semaptr->sem_perm.uid,
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semaptr->sem_perm.gid, otime_buf);
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printf(" nsems: %6d perm: %s\n",
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semaptr->sem_nsems,
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fmt_perm(semaptr->sem_perm.mode));
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if (show_sem_values) {
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int j, value;
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union semun junk;
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for (j = 0; j < semaptr->sem_nsems;
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j += 1) {
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if ((value = semctl(IXSEQ_TO_IPCID(i, semaptr->sem_perm), j, GETVAL, junk)) < 0) {
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printf("can't get semaphore values\n");
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break;
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}
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if (j % 5 == 0) {
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if (j == 0) {
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printf(" values: {");
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}
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else {
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printf("\n");
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printf(" ");
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}
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}
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printf(" %d", value);
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if (j == semaptr->sem_nsems - 1) {
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printf(" }\n");
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}
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else {
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printf(", ");
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}
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}
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}
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}
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}
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if (show_undo_values) {
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int j;
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int *ksemu, *semu;
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int semu_size;
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int got_one_undo = 0;
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semu = 0;
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semu_size = (int) SEMU(seminfo.semmnu);
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semu = (int *) malloc(semu_size);
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getsymbol(symbols, "_semu", &ksemu, sizeof(ksemu));
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getlocation(ksemu, semu, semu_size);
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printf("\nsem undos:\n");
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for (j = 0; j < seminfo.semmnu; j += 1) {
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struct sem_undo *suptr;
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int k;
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suptr = SEMU(j);
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if (suptr->un_proc != NULL) {
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struct proc proc;
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getlocation(suptr->un_proc, &proc,
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sizeof(proc));
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got_one_undo = 1;
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printf(" pid %d: semid semnum adjval\n",
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proc.p_pid);
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for (k = 0; k < suptr->un_cnt; k += 1) {
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printf(" %10d %5d %6d\n",
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IXSEQ_TO_IPCID(suptr->un_ent[k].un_id, xsema[suptr->un_ent[k].un_id].sem_perm),
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suptr->un_ent[k].un_num,
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suptr->un_ent[k].un_adjval);
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}
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}
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}
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if (!got_one_undo) {
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printf(" none allocated\n");
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}
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}
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(void) semconfig(SEM_CONFIG_THAW);
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}
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else {
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fprintf(stderr, "SVID semaphores facility not configured in the system\n");
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}
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if (getsymbol(symbols, "_msginfo", &msginfo, sizeof(msginfo))) {
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struct msqid_ds *xmsqids;
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printf("\nmsginfo:\n");
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printf("\tmsgmax: %6d\t(max characters in a message)\n",
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msginfo.msgmax);
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printf("\tmsgmni: %6d\t(# of message queues)\n",
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msginfo.msgmni);
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printf("\tmsgmnb: %6d\t(max characters in a message queue)\n",
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msginfo.msgmnb);
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printf("\tmsgtql: %6d\t(max # of messages in system)\n",
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msginfo.msgtql);
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printf("\tmsgssz: %6d\t(size of a message segment)\n",
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msginfo.msgssz);
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printf("\tmsgseg: %6d\t(# of message segments in system)\n",
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msginfo.msgseg);
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getsymbol(symbols, "_msqids", &msqids, sizeof(msqids));
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xmsqids = malloc(sizeof(struct msqid_ds) * msginfo.msgmni);
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getlocation(msqids, xmsqids, sizeof(struct msqid_ds) *
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msginfo.msgmni);
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for (i = 0; i < msginfo.msgmni; i += 1) {
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if (xmsqids[i].msg_qbytes != 0) {
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char stime_buf[100], rtime_buf[100],
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ctime_buf[100];
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struct msqid_ds *msqptr = &xmsqids[i];
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cvt_time(msqptr->msg_stime, stime_buf);
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cvt_time(msqptr->msg_rtime, rtime_buf);
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cvt_time(msqptr->msg_ctime, ctime_buf);
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printf("\nmsgq id: %d key: 0x%08x\n",
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IXSEQ_TO_IPCID(i, msqptr->msg_perm),
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msqptr->msg_perm.key);
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printf(" cuid: %6d cgid: %6d ctime: %s\n",
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msqptr->msg_perm.cuid,
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msqptr->msg_perm.cgid, ctime_buf);
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printf(" uid: %6d gid: %6d\n",
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msqptr->msg_perm.uid,
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msqptr->msg_perm.gid);
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printf(" lspid: %6d stime: %s\n",
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msqptr->msg_lspid, stime_buf);
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printf(" lrpid: %6d qnum: %6d rtime: %s\n",
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msqptr->msg_lrpid, msqptr->msg_qnum,
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rtime_buf);
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printf(" cbytes:%6d qbytes:%6d perm: %s\n",
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msqptr->msg_cbytes, msqptr->msg_qbytes,
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fmt_perm(msqptr->msg_perm.mode));
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}
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}
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}
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else {
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fprintf(stderr,
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"SVID messages facility not configured in the system\n");
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}
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exit(0);
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}
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