/* * ipcs.c -- provides information on allocated ipc resources. * * 01 Sept 2004 - Rodney Radford * Adapted for busybox from util-linux-2.12a. * * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. */ #include #include #include #include #include #include #include /* X/OPEN tells us to use for semctl() */ /* X/OPEN tells us to use for msgctl() */ /* X/OPEN tells us to use for shmctl() */ #include #include #include #include #include #include "busybox.h" /*-------------------------------------------------------------------*/ /* SHM_DEST and SHM_LOCKED are defined in kernel headers, but inside #ifdef __KERNEL__ ... #endif */ #ifndef SHM_DEST /* shm_mode upper byte flags */ #define SHM_DEST 01000 /* segment will be destroyed on last detach */ #define SHM_LOCKED 02000 /* segment will not be swapped */ #endif /* For older kernels the same holds for the defines below */ #ifndef MSG_STAT #define MSG_STAT 11 #define MSG_INFO 12 #endif #ifndef SHM_STAT #define SHM_STAT 13 #define SHM_INFO 14 struct shm_info { int used_ids; ulong shm_tot; /* total allocated shm */ ulong shm_rss; /* total resident shm */ ulong shm_swp; /* total swapped shm */ ulong swap_attempts; ulong swap_successes; }; #endif #ifndef SEM_STAT #define SEM_STAT 18 #define SEM_INFO 19 #endif /* Some versions of libc only define IPC_INFO when __USE_GNU is defined. */ #ifndef IPC_INFO #define IPC_INFO 3 #endif /*-------------------------------------------------------------------*/ /* The last arg of semctl is a union semun, but where is it defined? X/OPEN tells us to define it ourselves, but until recently Linux include files would also define it. */ #if defined (__GNU_LIBRARY__) && !defined(_SEM_SEMUN_UNDEFINED) /* union semun is defined by including */ #else /* according to X/OPEN we have to define it ourselves */ union semun { int val; struct semid_ds *buf; unsigned short int *array; struct seminfo *__buf; }; #endif /* X/OPEN (Jan 1987) does not define fields key, seq in struct ipc_perm; libc 4/5 does not mention struct ipc_term at all, but includes , which defines a struct ipc_perm with such fields. glibc-1.09 has no support for sysv ipc. glibc 2 uses __key, __seq */ #if defined (__GNU_LIBRARY__) && __GNU_LIBRARY__ > 1 #define KEY __key #else #define KEY key #endif #define LIMITS 1 #define STATUS 2 #define CREATOR 3 #define TIME 4 #define PID 5 static void print_perms (int id, struct ipc_perm *ipcp) { struct passwd *pw; struct group *gr; bb_printf ("%-10d %-10o", id, ipcp->mode & 0777); if ((pw = getpwuid(ipcp->cuid))) bb_printf(" %-10s", pw->pw_name); else bb_printf(" %-10d", ipcp->cuid); if ((gr = getgrgid(ipcp->cgid))) bb_printf(" %-10s", gr->gr_name); else bb_printf(" %-10d", ipcp->cgid); if ((pw = getpwuid(ipcp->uid))) bb_printf(" %-10s", pw->pw_name); else bb_printf(" %-10d", ipcp->uid); if ((gr = getgrgid(ipcp->gid))) bb_printf(" %-10s\n", gr->gr_name); else bb_printf(" %-10d\n", ipcp->gid); } static void do_shm (char format) { int maxid, shmid, id; struct shmid_ds shmseg; struct shm_info shm_info; struct shminfo shminfo; struct ipc_perm *ipcp = &shmseg.shm_perm; struct passwd *pw; maxid = shmctl (0, SHM_INFO, (struct shmid_ds *) (void *) &shm_info); if (maxid < 0) { bb_printf ("kernel not configured for shared memory\n"); return; } switch (format) { case LIMITS: bb_printf ("------ Shared Memory Limits --------\n"); if ((shmctl (0, IPC_INFO, (struct shmid_ds *) (void *) &shminfo)) < 0 ) return; /* glibc 2.1.3 and all earlier libc's have ints as fields of struct shminfo; glibc 2.1.91 has unsigned long; ach */ bb_printf ("max number of segments = %lu\n" "max seg size (kbytes) = %lu\n" "max total shared memory (pages) = %lu\n" "min seg size (bytes) = %lu\n", (unsigned long) shminfo.shmmni, (unsigned long) (shminfo.shmmax >> 10), (unsigned long) shminfo.shmall, (unsigned long) shminfo.shmmin); return; case STATUS: bb_printf ("------ Shared Memory Status --------\n" "segments allocated %d\n" "pages allocated %ld\n" "pages resident %ld\n" "pages swapped %ld\n" "Swap performance: %ld attempts\t %ld successes\n", shm_info.used_ids, shm_info.shm_tot, shm_info.shm_rss, shm_info.shm_swp, shm_info.swap_attempts, shm_info.swap_successes); return; case CREATOR: bb_printf ("------ Shared Memory Segment Creators/Owners --------\n" "%-10s %-10s %-10s %-10s %-10s %-10s\n", "shmid","perms","cuid","cgid","uid","gid"); break; case TIME: bb_printf ("------ Shared Memory Attach/Detach/Change Times --------\n" "%-10s %-10s %-20s %-20s %-20s\n", "shmid","owner","attached","detached","changed"); break; case PID: bb_printf ("------ Shared Memory Creator/Last-op --------\n" "%-10s %-10s %-10s %-10s\n", "shmid","owner","cpid","lpid"); break; default: bb_printf ("------ Shared Memory Segments --------\n" "%-10s %-10s %-10s %-10s %-10s %-10s %-12s\n", "key","shmid","owner","perms","bytes","nattch","status"); break; } for (id = 0; id <= maxid; id++) { shmid = shmctl (id, SHM_STAT, &shmseg); if (shmid < 0) continue; if (format == CREATOR) { print_perms (shmid, ipcp); continue; } pw = getpwuid(ipcp->uid); switch (format) { case TIME: if (pw) bb_printf ("%-10d %-10.10s", shmid, pw->pw_name); else bb_printf ("%-10d %-10d", shmid, ipcp->uid); /* ctime uses static buffer: use separate calls */ bb_printf(" %-20.16s", shmseg.shm_atime ? ctime(&shmseg.shm_atime) + 4 : "Not set"); bb_printf(" %-20.16s", shmseg.shm_dtime ? ctime(&shmseg.shm_dtime) + 4 : "Not set"); bb_printf(" %-20.16s\n", shmseg.shm_ctime ? ctime(&shmseg.shm_ctime) + 4 : "Not set"); break; case PID: if (pw) bb_printf ("%-10d %-10.10s", shmid, pw->pw_name); else bb_printf ("%-10d %-10d", shmid, ipcp->uid); bb_printf (" %-10d %-10d\n", shmseg.shm_cpid, shmseg.shm_lpid); break; default: bb_printf("0x%08x ",ipcp->KEY ); if (pw) bb_printf ("%-10d %-10.10s", shmid, pw->pw_name); else bb_printf ("%-10d %-10d", shmid, ipcp->uid); bb_printf ("%-10o %-10lu %-10ld %-6s %-6s\n", ipcp->mode & 0777, /* * earlier: int, Austin has size_t */ (unsigned long) shmseg.shm_segsz, /* * glibc-2.1.3 and earlier has unsigned short; * Austin has shmatt_t */ (long) shmseg.shm_nattch, ipcp->mode & SHM_DEST ? "dest" : " ", ipcp->mode & SHM_LOCKED ? "locked" : " "); break; } } return; } static void do_sem (char format) { int maxid, semid, id; struct semid_ds semary; struct seminfo seminfo; struct ipc_perm *ipcp = &semary.sem_perm; struct passwd *pw; union semun arg; arg.array = (ushort *) (void *) &seminfo; maxid = semctl (0, 0, SEM_INFO, arg); if (maxid < 0) { bb_printf ("kernel not configured for semaphores\n"); return; } switch (format) { case LIMITS: bb_printf ("------ Semaphore Limits --------\n"); arg.array = (ushort *) (void *) &seminfo; /* damn union */ if ((semctl (0, 0, IPC_INFO, arg)) < 0 ) return; bb_printf ("max number of arrays = %d\n" "max semaphores per array = %d\n" "max semaphores system wide = %d\n" "max ops per semop call = %d\n" "semaphore max value = %d\n", seminfo.semmni, seminfo.semmsl, seminfo.semmns, seminfo.semopm, seminfo.semvmx); return; case STATUS: bb_printf ("------ Semaphore Status --------\n" "used arrays = %d\n" "allocated semaphores = %d\n", seminfo.semusz, seminfo.semaem); return; case CREATOR: bb_printf ("------ Semaphore Arrays Creators/Owners --------\n" "%-10s %-10s %-10s %-10s %-10s %-10s\n", "semid","perms","cuid","cgid","uid","gid"); break; case TIME: bb_printf ("------ Shared Memory Operation/Change Times --------\n" "%-8s %-10s %-26.24s %-26.24s\n", "shmid","owner","last-op","last-changed"); break; case PID: break; default: bb_printf ("------ Semaphore Arrays --------\n" "%-10s %-10s %-10s %-10s %-10s\n", "key","semid","owner","perms","nsems"); break; } for (id = 0; id <= maxid; id++) { arg.buf = (struct semid_ds *) &semary; semid = semctl (id, 0, SEM_STAT, arg); if (semid < 0) continue; if (format == CREATOR) { print_perms (semid, ipcp); continue; } pw = getpwuid(ipcp->uid); switch (format) { case TIME: if (pw) bb_printf ("%-8d %-10.10s", semid, pw->pw_name); else bb_printf ("%-8d %-10d", semid, ipcp->uid); bb_printf (" %-26.24s", semary.sem_otime ? ctime(&semary.sem_otime) : "Not set"); bb_printf (" %-26.24s\n", semary.sem_ctime ? ctime(&semary.sem_ctime) : "Not set"); break; case PID: break; default: bb_printf("0x%08x ", ipcp->KEY); if (pw) bb_printf ("%-10d %-10.9s", semid, pw->pw_name); else bb_printf ("%-10d %-9d", semid, ipcp->uid); bb_printf ("%-10o %-10ld\n", ipcp->mode & 0777, /* * glibc-2.1.3 and earlier has unsigned short; * glibc-2.1.91 has variation between * unsigned short and unsigned long * Austin prescribes unsigned short. */ (long) semary.sem_nsems); break; } } } static void do_msg (char format) { int maxid, msqid, id; struct msqid_ds msgque; struct msginfo msginfo; struct ipc_perm *ipcp = &msgque.msg_perm; struct passwd *pw; maxid = msgctl (0, MSG_INFO, (struct msqid_ds *) (void *) &msginfo); if (maxid < 0) { bb_printf ("kernel not configured for message queues\n"); return; } switch (format) { case LIMITS: if ((msgctl (0, IPC_INFO, (struct msqid_ds *) (void *) &msginfo)) < 0 ) return; bb_printf ("------ Messages: Limits --------\n" "max queues system wide = %d\n" "max size of message (bytes) = %d\n" "default max size of queue (bytes) = %d\n", msginfo.msgmni, msginfo.msgmax, msginfo.msgmnb); return; case STATUS: bb_printf ("------ Messages: Status --------\n" "allocated queues = %d\n" "used headers = %d\n" "used space = %d bytes\n", msginfo.msgpool, msginfo.msgmap, msginfo.msgtql); return; case CREATOR: bb_printf ("------ Message Queues: Creators/Owners --------\n" "%-10s %-10s %-10s %-10s %-10s %-10s\n", "msqid","perms","cuid","cgid","uid","gid"); break; case TIME: bb_printf ("------ Message Queues Send/Recv/Change Times --------\n" "%-8s %-10s %-20s %-20s %-20s\n", "msqid","owner","send","recv","change"); break; case PID: bb_printf ("------ Message Queues PIDs --------\n" "%-10s %-10s %-10s %-10s\n", "msqid","owner","lspid","lrpid"); break; default: bb_printf ("------ Message Queues --------\n" "%-10s %-10s %-10s %-10s %-12s %-12s\n", "key","msqid","owner","perms","used-bytes","messages"); break; } for (id = 0; id <= maxid; id++) { msqid = msgctl (id, MSG_STAT, &msgque); if (msqid < 0) continue; if (format == CREATOR) { print_perms (msqid, ipcp); continue; } pw = getpwuid(ipcp->uid); switch (format) { case TIME: if (pw) bb_printf ("%-8d %-10.10s", msqid, pw->pw_name); else bb_printf ("%-8d %-10d", msqid, ipcp->uid); bb_printf (" %-20.16s", msgque.msg_stime ? ctime(&msgque.msg_stime) + 4 : "Not set"); bb_printf (" %-20.16s", msgque.msg_rtime ? ctime(&msgque.msg_rtime) + 4 : "Not set"); bb_printf (" %-20.16s\n", msgque.msg_ctime ? ctime(&msgque.msg_ctime) + 4 : "Not set"); break; case PID: if (pw) bb_printf ("%-8d %-10.10s", msqid, pw->pw_name); else bb_printf ("%-8d %-10d", msqid, ipcp->uid); bb_printf (" %5d %5d\n", msgque.msg_lspid, msgque.msg_lrpid); break; default: bb_printf( "0x%08x ",ipcp->KEY ); if (pw) bb_printf ("%-10d %-10.10s", msqid, pw->pw_name); else bb_printf ("%-10d %-10d", msqid, ipcp->uid); bb_printf (" %-10o %-12ld %-12ld\n", ipcp->mode & 0777, /* * glibc-2.1.3 and earlier has unsigned short; * glibc-2.1.91 has variation between * unsigned short, unsigned long * Austin has msgqnum_t */ (long) msgque.msg_cbytes, (long) msgque.msg_qnum); break; } } return; } static void print_shm (int shmid) { struct shmid_ds shmds; struct ipc_perm *ipcp = &shmds.shm_perm; if (shmctl (shmid, IPC_STAT, &shmds) == -1) { perror ("shmctl "); return; } bb_printf ("\nShared memory Segment shmid=%d\n" "uid=%d\tgid=%d\tcuid=%d\tcgid=%d\n" "mode=%#o\taccess_perms=%#o\n" "bytes=%ld\tlpid=%d\tcpid=%d\tnattch=%ld\n" "att_time=%-26.24s\n" "det_time=%-26.24s\n" "change_time=%-26.24s\n" "\n", shmid, ipcp->uid, ipcp->gid, ipcp->cuid, ipcp->cgid, ipcp->mode, ipcp->mode & 0777, (long) shmds.shm_segsz, shmds.shm_lpid, shmds.shm_cpid, (long) shmds.shm_nattch, shmds.shm_atime ? ctime (&shmds.shm_atime) : "Not set", shmds.shm_dtime ? ctime (&shmds.shm_dtime) : "Not set", ctime (&shmds.shm_ctime)); return; } static void print_msg (int msqid) { struct msqid_ds buf; struct ipc_perm *ipcp = &buf.msg_perm; if (msgctl (msqid, IPC_STAT, &buf) == -1) { perror ("msgctl "); return; } bb_printf ("\nMessage Queue msqid=%d\n" "uid=%d\tgid=%d\tcuid=%d\tcgid=%d\tmode=%#o\n" "cbytes=%ld\tqbytes=%ld\tqnum=%ld\tlspid=%d\tlrpid=%d\n" "send_time=%-26.24s\n" "rcv_time=%-26.24s\n" "change_time=%-26.24s\n" "\n", msqid, ipcp->uid, ipcp->gid, ipcp->cuid, ipcp->cgid, ipcp->mode, /* * glibc-2.1.3 and earlier has unsigned short; * glibc-2.1.91 has variation between * unsigned short, unsigned long * Austin has msgqnum_t (for msg_qbytes) */ (long) buf.msg_cbytes, (long) buf.msg_qbytes, (long) buf.msg_qnum, buf.msg_lspid, buf.msg_lrpid, buf.msg_stime ? ctime (&buf.msg_stime) : "Not set", buf.msg_rtime ? ctime (&buf.msg_rtime) : "Not set", buf.msg_ctime ? ctime (&buf.msg_ctime) : "Not set"); return; } static void print_sem (int semid) { struct semid_ds semds; struct ipc_perm *ipcp = &semds.sem_perm; union semun arg; unsigned int i; arg.buf = &semds; if (semctl (semid, 0, IPC_STAT, arg) < 0) { perror ("semctl "); return; } bb_printf ("\nSemaphore Array semid=%d\n" "uid=%d\t gid=%d\t cuid=%d\t cgid=%d\n" "mode=%#o, access_perms=%#o\n" "nsems = %ld\n" "otime = %-26.24s\n" "ctime = %-26.24s\n" "%-10s %-10s %-10s %-10s %-10s\n", semid, ipcp->uid, ipcp->gid, ipcp->cuid, ipcp->cgid, ipcp->mode, ipcp->mode & 0777, (long) semds.sem_nsems, semds.sem_otime ? ctime (&semds.sem_otime) : "Not set", ctime (&semds.sem_ctime), "semnum","value","ncount","zcount","pid"); arg.val = 0; for (i=0; i < semds.sem_nsems; i++) { int val, ncnt, zcnt, pid; val = semctl (semid, i, GETVAL, arg); ncnt = semctl (semid, i, GETNCNT, arg); zcnt = semctl (semid, i, GETZCNT, arg); pid = semctl (semid, i, GETPID, arg); if (val < 0 || ncnt < 0 || zcnt < 0 || pid < 0) { perror ("semctl "); bb_fflush_stdout_and_exit (1); } bb_printf ("%-10d %-10d %-10d %-10d %-10d\n", i, val, ncnt, zcnt, pid); } bb_printf ("\n"); return; } int ipcs_main (int argc, char **argv) { int opt, msg = 0, sem = 0, shm = 0, id=0, print=0; char format = 0; char options[] = "atclupsmqi:ih?"; while ((opt = getopt (argc, argv, options)) != -1) { switch (opt) { case 'i': id = atoi (optarg); print = 1; break; case 'a': msg = shm = sem = 1; break; case 'q': msg = 1; break; case 's': sem = 1; break; case 'm': shm = 1; break; case 't': format = TIME; break; case 'c': format = CREATOR; break; case 'p': format = PID; break; case 'l': format = LIMITS; break; case 'u': format = STATUS; break; case 'h': case '?': bb_show_usage(); bb_fflush_stdout_and_exit (0); } } if (print) { if (shm) { print_shm (id); bb_fflush_stdout_and_exit (0); } if (sem) { print_sem (id); bb_fflush_stdout_and_exit (0); } if (msg) { print_msg (id); bb_fflush_stdout_and_exit (0); } bb_show_usage(); bb_fflush_stdout_and_exit (0); } if ( !shm && !msg && !sem) msg = sem = shm = 1; bb_printf ("\n"); if (shm) { do_shm (format); bb_printf ("\n"); } if (sem) { do_sem (format); bb_printf ("\n"); } if (msg) { do_msg (format); bb_printf ("\n"); } return 0; }