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36a176ecb7
freebsd/usr.bin/ipcs/ipcs.c
Edwin Groothuis 55e2cb41f2 Add the ability to clean up all shared memory segments which are 
unused in one go.

From the original PR:

	I've observed that linux apps running under the linuxulator
	have a habit of leaving behind shared memory segments which
	are unused, but which eventually cause the system to run
	out of free segments and these apps will stop working.
	ipcrm(1) currently only allows removal of unused message
	queues, shared memory segments and semaphores on an individual
	basis, or those having a matching (non-zero) key. However
	it would often be convenient to just do a complete cleanup
	of everything, usually as root.

PR:		bin/118292
Submitted by:	Callum Gibson <callumgibson@optusnet.com.au>
Not reviewed by:	grog@
Approved by:	grog@
2007-12-25 00:52:24 +00:00

572 lines
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/*
* Copyright (c) 1994 SigmaSoft, Th. Lockert <tholo@sigmasoft.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/proc.h>
#define _KERNEL
#include <sys/sem.h>
#include <sys/shm.h>
#include <sys/msg.h>
#undef _KERNEL
#include <err.h>
#include <fcntl.h>
#include <grp.h>
#include <kvm.h>
#include <limits.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "ipc.h"
char *fmt_perm(u_short);
void cvt_time(time_t, char *);
void usage(void);
uid_t user2uid(char *username);
void print_kmsqtotal(struct msginfo msginfo);
void print_kmsqheader(int option);
void print_kmsqptr(int i, int option, struct msqid_kernel *kmsqptr);
void print_kshmtotal(struct shminfo shminfo);
void print_kshmheader(int option);
void print_kshmptr(int i, int option, struct shmid_kernel *kshmptr);
void print_ksemtotal(struct seminfo seminfo);
void print_ksemheader(int option);
void print_ksemptr(int i, int option, struct semid_kernel *ksemaptr);
char *
fmt_perm(u_short mode)
{
static char buffer[100];
buffer[0] = '-';
buffer[1] = '-';
buffer[2] = ((mode & 0400) ? 'r' : '-');
buffer[3] = ((mode & 0200) ? 'w' : '-');
buffer[4] = ((mode & 0100) ? 'a' : '-');
buffer[5] = ((mode & 0040) ? 'r' : '-');
buffer[6] = ((mode & 0020) ? 'w' : '-');
buffer[7] = ((mode & 0010) ? 'a' : '-');
buffer[8] = ((mode & 0004) ? 'r' : '-');
buffer[9] = ((mode & 0002) ? 'w' : '-');
buffer[10] = ((mode & 0001) ? 'a' : '-');
buffer[11] = '\0';
return (&buffer[0]);
}
void
cvt_time(time_t t, char *buf)
{
struct tm *tm;
if (t == 0) {
strcpy(buf, "no-entry");
} else {
tm = localtime(&t);
sprintf(buf, "%2d:%02d:%02d",
tm->tm_hour, tm->tm_min, tm->tm_sec);
}
}
#define BIGGEST 1
#define CREATOR 2
#define OUTSTANDING 4
#define PID 8
#define TIME 16
int
main(int argc, char *argv[])
{
int display = SHMINFO | MSGINFO | SEMINFO;
int option = 0;
char *core = NULL, *user = NULL, *namelist = NULL;
char kvmoferr[_POSIX2_LINE_MAX]; /* Error buf for kvm_openfiles. */
int i;
uid_t uid = 0;
while ((i = getopt(argc, argv, "MmQqSsabC:cN:optTu:y")) != -1)
switch (i) {
case 'a':
option |= BIGGEST | CREATOR | OUTSTANDING | PID | TIME;
break;
case 'b':
option |= BIGGEST;
break;
case 'C':
core = optarg;
break;
case 'c':
option |= CREATOR;
break;
case 'M':
display = SHMTOTAL;
break;
case 'm':
display = SHMINFO;
break;
case 'N':
namelist = optarg;
break;
case 'o':
option |= OUTSTANDING;
break;
case 'p':
option |= PID;
break;
case 'Q':
display = MSGTOTAL;
break;
case 'q':
display = MSGINFO;
break;
case 'S':
display = SEMTOTAL;
break;
case 's':
display = SEMINFO;
break;
case 'T':
display = SHMTOTAL | MSGTOTAL | SEMTOTAL;
break;
case 't':
option |= TIME;
break;
case 'u':
user = optarg;
uid = user2uid(user);
break;
case 'y':
use_sysctl = 0;
break;
default:
usage();
}
/*
* If paths to the exec file or core file were specified, we
* aren't operating on the running kernel, so we can't use
* sysctl.
*/
if (namelist != NULL || core != NULL)
use_sysctl = 0;
if (!use_sysctl) {
kd = kvm_openfiles(namelist, core, NULL, O_RDONLY, kvmoferr);
if (kd == NULL)
errx(1, "kvm_openfiles: %s", kvmoferr);
switch (kvm_nlist(kd, symbols)) {
case 0:
break;
case -1:
errx(1, "unable to read kernel symbol table");
default:
break;
}
}
kget(X_MSGINFO, &msginfo, sizeof(msginfo));
if ((display & (MSGINFO | MSGTOTAL))) {
if (display & MSGTOTAL)
print_kmsqtotal(msginfo);
if (display & MSGINFO) {
struct msqid_kernel *kxmsqids;
size_t kxmsqids_len;
kxmsqids_len =
sizeof(struct msqid_kernel) * msginfo.msgmni;
kxmsqids = malloc(kxmsqids_len);
kget(X_MSQIDS, kxmsqids, kxmsqids_len);
print_kmsqheader(option);
for (i = 0; i < msginfo.msgmni; i += 1) {
if (kxmsqids[i].u.msg_qbytes != 0) {
if (user &&
uid != kxmsqids[i].u.msg_perm.uid)
continue;
print_kmsqptr(i, option, &kxmsqids[i]);
}
}
printf("\n");
}
} else
if (display & (MSGINFO | MSGTOTAL)) {
fprintf(stderr,
"SVID messages facility "
"not configured in the system\n");
}
kget(X_SHMINFO, &shminfo, sizeof(shminfo));
if ((display & (SHMINFO | SHMTOTAL))) {
if (display & SHMTOTAL)
print_kshmtotal(shminfo);
if (display & SHMINFO) {
struct shmid_kernel *kxshmids;
size_t kxshmids_len;
kxshmids_len =
sizeof(struct shmid_kernel) * shminfo.shmmni;
kxshmids = malloc(kxshmids_len);
kget(X_SHMSEGS, kxshmids, kxshmids_len);
print_kshmheader(option);
for (i = 0; i < shminfo.shmmni; i += 1) {
if (kxshmids[i].u.shm_perm.mode & 0x0800) {
if (user &&
uid != kxshmids[i].u.shm_perm.uid)
continue;
print_kshmptr(i, option, &kxshmids[i]);
}
}
printf("\n");
}
} else
if (display & (SHMINFO | SHMTOTAL)) {
fprintf(stderr,
"SVID shared memory facility "
"not configured in the system\n");
}
kget(X_SEMINFO, &seminfo, sizeof(seminfo));
if ((display & (SEMINFO | SEMTOTAL))) {
struct semid_kernel *kxsema;
size_t kxsema_len;
if (display & SEMTOTAL)
print_ksemtotal(seminfo);
if (display & SEMINFO) {
kxsema_len =
sizeof(struct semid_kernel) * seminfo.semmni;
kxsema = malloc(kxsema_len);
kget(X_SEMA, kxsema, kxsema_len);
print_ksemheader(option);
for (i = 0; i < seminfo.semmni; i += 1) {
if ((kxsema[i].u.sem_perm.mode & SEM_ALLOC)
!= 0) {
if (user &&
uid != kxsema[i].u.sem_perm.uid)
continue;
print_ksemptr(i, option, &kxsema[i]);
}
}
printf("\n");
}
} else
if (display & (SEMINFO | SEMTOTAL)) {
fprintf(stderr,
"SVID semaphores facility "
"not configured in the system\n");
}
if (!use_sysctl)
kvm_close(kd);
exit(0);
}
void
print_kmsqtotal(struct msginfo msginfo)
{
printf("msginfo:\n");
printf("\tmsgmax: %12d\t(max characters in a message)\n",
msginfo.msgmax);
printf("\tmsgmni: %12d\t(# of message queues)\n",
msginfo.msgmni);
printf("\tmsgmnb: %12d\t(max characters in a message queue)\n",
msginfo.msgmnb);
printf("\tmsgtql: %12d\t(max # of messages in system)\n",
msginfo.msgtql);
printf("\tmsgssz: %12d\t(size of a message segment)\n",
msginfo.msgssz);
printf("\tmsgseg: %12d\t(# of message segments in system)\n\n",
msginfo.msgseg);
}
void print_kmsqheader(int option)
{
printf("Message Queues:\n");
printf("T %12s %12s %-11s %-8s %-8s",
"ID", "KEY", "MODE", "OWNER", "GROUP");
if (option & CREATOR)
printf(" %-8s %-8s", "CREATOR", "CGROUP");
if (option & OUTSTANDING)
printf(" %20s %20s", "CBYTES", "QNUM");
if (option & BIGGEST)
printf(" %20s", "QBYTES");
if (option & PID)
printf(" %12s %12s", "LSPID", "LRPID");
if (option & TIME)
printf(" %-8s %-8s %-8s", "STIME", "RTIME", "CTIME");
printf("\n");
}
void
print_kmsqptr(int i, int option, struct msqid_kernel *kmsqptr)
{
char stime_buf[100], rtime_buf[100], ctime_buf[100];
cvt_time(kmsqptr->u.msg_stime, stime_buf);
cvt_time(kmsqptr->u.msg_rtime, rtime_buf);
cvt_time(kmsqptr->u.msg_ctime, ctime_buf);
printf("q %12d %12d %s %-8s %-8s",
IXSEQ_TO_IPCID(i, kmsqptr->u.msg_perm),
(int)kmsqptr->u.msg_perm.key,
fmt_perm(kmsqptr->u.msg_perm.mode),
user_from_uid(kmsqptr->u.msg_perm.uid, 0),
group_from_gid(kmsqptr->u.msg_perm.gid, 0));
if (option & CREATOR)
printf(" %-8s %-8s",
user_from_uid(kmsqptr->u.msg_perm.cuid, 0),
group_from_gid(kmsqptr->u.msg_perm.cgid, 0));
if (option & OUTSTANDING)
printf(" %12lu %12lu",
kmsqptr->u.msg_cbytes,
kmsqptr->u.msg_qnum);
if (option & BIGGEST)
printf(" %20lu", kmsqptr->u.msg_qbytes);
if (option & PID)
printf(" %12d %12d",
kmsqptr->u.msg_lspid,
kmsqptr->u.msg_lrpid);
if (option & TIME)
printf(" %s %s %s",
stime_buf,
rtime_buf,
ctime_buf);
printf("\n");
}
void
print_kshmtotal(struct shminfo shminfo)
{
printf("shminfo:\n");
printf("\tshmmax: %12d\t(max shared memory segment size)\n",
shminfo.shmmax);
printf("\tshmmin: %12d\t(min shared memory segment size)\n",
shminfo.shmmin);
printf("\tshmmni: %12d\t(max number of shared memory identifiers)\n",
shminfo.shmmni);
printf("\tshmseg: %12d\t(max shared memory segments per process)\n",
shminfo.shmseg);
printf("\tshmall: %12d\t(max amount of shared memory in pages)\n\n",
shminfo.shmall);
}
void
print_kshmheader(int option)
{
printf("Shared Memory:\n");
printf("T %12s %12s %-11s %-8s %-8s",
"ID", "KEY", "MODE", "OWNER", "GROUP");
if (option & CREATOR)
printf(" %-8s %-8s", "CREATOR", "CGROUP");
if (option & OUTSTANDING)
printf(" %12s", "NATTCH");
if (option & BIGGEST)
printf(" %12s", "SEGSZ");
if (option & PID)
printf(" %12s %12s", "CPID", "LPID");
if (option & TIME)
printf(" %-8s %-8s %-8s", "ATIME", "DTIME", "CTIME");
printf("\n");
}
void
print_kshmptr(int i, int option, struct shmid_kernel *kshmptr)
{
char atime_buf[100], dtime_buf[100], ctime_buf[100];
cvt_time(kshmptr->u.shm_atime, atime_buf);
cvt_time(kshmptr->u.shm_dtime, dtime_buf);
cvt_time(kshmptr->u.shm_ctime, ctime_buf);
printf("m %12d %12d %s %-8s %-8s",
IXSEQ_TO_IPCID(i, kshmptr->u.shm_perm),
(int)kshmptr->u.shm_perm.key,
fmt_perm(kshmptr->u.shm_perm.mode),
user_from_uid(kshmptr->u.shm_perm.uid, 0),
group_from_gid(kshmptr->u.shm_perm.gid, 0));
if (option & CREATOR)
printf(" %-8s %-8s",
user_from_uid(kshmptr->u.shm_perm.cuid, 0),
group_from_gid(kshmptr->u.shm_perm.cgid, 0));
if (option & OUTSTANDING)
printf(" %12d",
kshmptr->u.shm_nattch);
if (option & BIGGEST)
printf(" %12d",
kshmptr->u.shm_segsz);
if (option & PID)
printf(" %12d %12d",
kshmptr->u.shm_cpid,
kshmptr->u.shm_lpid);
if (option & TIME)
printf(" %s %s %s",
atime_buf,
dtime_buf,
ctime_buf);
printf("\n");
}
void
print_ksemtotal(struct seminfo seminfo)
{
printf("seminfo:\n");
printf("\tsemmap: %12d\t(# of entries in semaphore map)\n",
seminfo.semmap);
printf("\tsemmni: %12d\t(# of semaphore identifiers)\n",
seminfo.semmni);
printf("\tsemmns: %12d\t(# of semaphores in system)\n",
seminfo.semmns);
printf("\tsemmnu: %12d\t(# of undo structures in system)\n",
seminfo.semmnu);
printf("\tsemmsl: %12d\t(max # of semaphores per id)\n",
seminfo.semmsl);
printf("\tsemopm: %12d\t(max # of operations per semop call)\n",
seminfo.semopm);
printf("\tsemume: %12d\t(max # of undo entries per process)\n",
seminfo.semume);
printf("\tsemusz: %12d\t(size in bytes of undo structure)\n",
seminfo.semusz);
printf("\tsemvmx: %12d\t(semaphore maximum value)\n",
seminfo.semvmx);
printf("\tsemaem: %12d\t(adjust on exit max value)\n\n",
seminfo.semaem);
}
void
print_ksemheader(int option)
{
printf("Semaphores:\n");
printf("T %12s %12s %-11s %-8s %-8s",
"ID", "KEY", "MODE", "OWNER", "GROUP");
if (option & CREATOR)
printf(" %-8s %-8s", "CREATOR", "CGROUP");
if (option & BIGGEST)
printf(" %12s", "NSEMS");
if (option & TIME)
printf(" %-8s %-8s", "OTIME", "CTIME");
printf("\n");
}
void
print_ksemptr(int i, int option, struct semid_kernel *ksemaptr)
{
char ctime_buf[100], otime_buf[100];
cvt_time(ksemaptr->u.sem_otime, otime_buf);
cvt_time(ksemaptr->u.sem_ctime, ctime_buf);
printf("s %12d %12d %s %-8s %-8s",
IXSEQ_TO_IPCID(i, ksemaptr->u.sem_perm),
(int)ksemaptr->u.sem_perm.key,
fmt_perm(ksemaptr->u.sem_perm.mode),
user_from_uid(ksemaptr->u.sem_perm.uid, 0),
group_from_gid(ksemaptr->u.sem_perm.gid, 0));
if (option & CREATOR)
printf(" %-8s %-8s",
user_from_uid(ksemaptr->u.sem_perm.cuid, 0),
group_from_gid(ksemaptr->u.sem_perm.cgid, 0));
if (option & BIGGEST)
printf(" %12d",
ksemaptr->u.sem_nsems);
if (option & TIME)
printf(" %s %s",
otime_buf,
ctime_buf);
printf("\n");
}
uid_t
user2uid(char *username)
{
struct passwd *pwd;
uid_t uid;
char *r;
uid = strtoul(username, &r, 0);
if (!*r && r != username)
return (uid);
if ((pwd = getpwnam(username)) == NULL)
errx(1, "getpwnam failed: No such user");
endpwent();
return (pwd->pw_uid);
}
void
usage(void)
{
fprintf(stderr,
"usage: "
"ipcs [-abcmopqstyMQST] [-C corefile] [-N namelist] [-u user]\n");
exit(1);
}
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