summaryrefslogtreecommitdiffstats
path: root/sys-utils/ipcutils.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 13:14:44 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 13:14:44 +0000
commit30ff6afe596eddafacf22b1a5b2d1a3d6254ea15 (patch)
tree9b788335f92174baf7ee18f03ca8330b8c19ce2b /sys-utils/ipcutils.c
parentInitial commit. (diff)
downloadutil-linux-30ff6afe596eddafacf22b1a5b2d1a3d6254ea15.tar.xz
util-linux-30ff6afe596eddafacf22b1a5b2d1a3d6254ea15.zip
Adding upstream version 2.36.1.upstream/2.36.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'sys-utils/ipcutils.c')
-rw-r--r--sys-utils/ipcutils.c536
1 files changed, 536 insertions, 0 deletions
diff --git a/sys-utils/ipcutils.c b/sys-utils/ipcutils.c
new file mode 100644
index 0000000..674b612
--- /dev/null
+++ b/sys-utils/ipcutils.c
@@ -0,0 +1,536 @@
+#include <inttypes.h>
+
+#include "c.h"
+#include "nls.h"
+#include "xalloc.h"
+#include "path.h"
+#include "pathnames.h"
+#include "ipcutils.h"
+#include "strutils.h"
+
+#ifndef SEMVMX
+# define SEMVMX 32767 /* <= 32767 semaphore maximum value */
+#endif
+#ifndef SHMMIN
+# define SHMMIN 1 /* min shared segment size in bytes */
+#endif
+
+
+int ipc_msg_get_limits(struct ipc_limits *lim)
+{
+ if (access(_PATH_PROC_IPC_MSGMNI, F_OK) == 0 &&
+ access(_PATH_PROC_IPC_MSGMNB, F_OK) == 0 &&
+ access(_PATH_PROC_IPC_MSGMAX, F_OK) == 0) {
+
+ if (ul_path_read_s32(NULL, &lim->msgmni, _PATH_PROC_IPC_MSGMNI) != 0)
+ return 1;
+ if (ul_path_read_s32(NULL, &lim->msgmnb, _PATH_PROC_IPC_MSGMNB) != 0)
+ return 1;
+ if (ul_path_read_u64(NULL, &lim->msgmax, _PATH_PROC_IPC_MSGMAX) != 0)
+ return 1;
+ } else {
+ struct msginfo msginfo;
+
+ if (msgctl(0, IPC_INFO, (struct msqid_ds *) &msginfo) < 0)
+ return 1;
+ lim->msgmni = msginfo.msgmni;
+ lim->msgmnb = msginfo.msgmnb;
+ lim->msgmax = msginfo.msgmax;
+ }
+
+ return 0;
+}
+
+int ipc_sem_get_limits(struct ipc_limits *lim)
+{
+ FILE *f;
+ int rc = 0;
+
+ lim->semvmx = SEMVMX;
+
+ f = fopen(_PATH_PROC_IPC_SEM, "r");
+ if (f) {
+ rc = fscanf(f, "%d\t%d\t%d\t%d",
+ &lim->semmsl, &lim->semmns, &lim->semopm, &lim->semmni);
+ fclose(f);
+ }
+
+ if (rc != 4) {
+ struct seminfo seminfo = { .semmni = 0 };
+ union semun arg = { .array = (ushort *) &seminfo };
+
+ if (semctl(0, 0, IPC_INFO, arg) < 0)
+ return 1;
+ lim->semmni = seminfo.semmni;
+ lim->semmsl = seminfo.semmsl;
+ lim->semmns = seminfo.semmns;
+ lim->semopm = seminfo.semopm;
+ }
+
+ return 0;
+}
+
+int ipc_shm_get_limits(struct ipc_limits *lim)
+{
+ lim->shmmin = SHMMIN;
+
+ if (access(_PATH_PROC_IPC_SHMALL, F_OK) == 0 &&
+ access(_PATH_PROC_IPC_SHMMAX, F_OK) == 0 &&
+ access(_PATH_PROC_IPC_SHMMNI, F_OK) == 0) {
+
+ ul_path_read_u64(NULL, &lim->shmall, _PATH_PROC_IPC_SHMALL);
+ ul_path_read_u64(NULL, &lim->shmmax, _PATH_PROC_IPC_SHMMAX);
+ ul_path_read_u64(NULL, &lim->shmmni, _PATH_PROC_IPC_SHMMNI);
+
+ } else {
+ struct shminfo *shminfo;
+ struct shmid_ds shmbuf;
+
+ if (shmctl(0, IPC_INFO, &shmbuf) < 0)
+ return 1;
+ shminfo = (struct shminfo *) &shmbuf;
+ lim->shmmni = shminfo->shmmni;
+ lim->shmall = shminfo->shmall;
+ lim->shmmax = shminfo->shmmax;
+ }
+
+ return 0;
+}
+
+int ipc_shm_get_info(int id, struct shm_data **shmds)
+{
+ FILE *f;
+ int i = 0, maxid;
+ char buf[BUFSIZ];
+ struct shm_data *p;
+ struct shmid_ds dummy;
+
+ p = *shmds = xcalloc(1, sizeof(struct shm_data));
+ p->next = NULL;
+
+ f = fopen(_PATH_PROC_SYSV_SHM, "r");
+ if (!f)
+ goto shm_fallback;
+
+ while (fgetc(f) != '\n'); /* skip header */
+
+ while (fgets(buf, sizeof(buf), f) != NULL) {
+ /* scan for the first 14-16 columns (e.g. Linux 2.6.32 has 14) */
+ p->shm_rss = 0xdead;
+ p->shm_swp = 0xdead;
+ if (sscanf(buf,
+ "%d %d %o %"SCNu64 " %u %u "
+ "%"SCNu64 " %u %u %u %u %"SCNi64 " %"SCNi64 " %"SCNi64
+ " %"SCNu64 " %"SCNu64 "\n",
+ &p->shm_perm.key,
+ &p->shm_perm.id,
+ &p->shm_perm.mode,
+ &p->shm_segsz,
+ &p->shm_cprid,
+ &p->shm_lprid,
+ &p->shm_nattch,
+ &p->shm_perm.uid,
+ &p->shm_perm.gid,
+ &p->shm_perm.cuid,
+ &p->shm_perm.cgid,
+ &p->shm_atim,
+ &p->shm_dtim,
+ &p->shm_ctim,
+ &p->shm_rss,
+ &p->shm_swp) < 14)
+ continue; /* invalid line, skipped */
+
+ if (id > -1) {
+ /* ID specified */
+ if (id == p->shm_perm.id) {
+ i = 1;
+ break;
+ }
+ continue;
+ }
+
+ p->next = xcalloc(1, sizeof(struct shm_data));
+ p = p->next;
+ p->next = NULL;
+ i++;
+ }
+
+ if (i == 0)
+ free(*shmds);
+ fclose(f);
+ return i;
+
+ /* Fallback; /proc or /sys file(s) missing. */
+shm_fallback:
+ maxid = shmctl(0, SHM_INFO, &dummy);
+
+ for (int j = 0; j <= maxid; j++) {
+ int shmid;
+ struct shmid_ds shmseg;
+ struct ipc_perm *ipcp = &shmseg.shm_perm;
+
+ shmid = shmctl(j, SHM_STAT, &shmseg);
+ if (shmid < 0 || (id > -1 && shmid != id)) {
+ continue;
+ }
+
+ i++;
+ p->shm_perm.key = ipcp->KEY;
+ p->shm_perm.id = shmid;
+ p->shm_perm.mode = ipcp->mode;
+ p->shm_segsz = shmseg.shm_segsz;
+ p->shm_cprid = shmseg.shm_cpid;
+ p->shm_lprid = shmseg.shm_lpid;
+ p->shm_nattch = shmseg.shm_nattch;
+ p->shm_perm.uid = ipcp->uid;
+ p->shm_perm.gid = ipcp->gid;
+ p->shm_perm.cuid = ipcp->cuid;
+ p->shm_perm.cgid = ipcp->cuid;
+ p->shm_atim = shmseg.shm_atime;
+ p->shm_dtim = shmseg.shm_dtime;
+ p->shm_ctim = shmseg.shm_ctime;
+ p->shm_rss = 0xdead;
+ p->shm_swp = 0xdead;
+
+ if (id < 0) {
+ p->next = xcalloc(1, sizeof(struct shm_data));
+ p = p->next;
+ p->next = NULL;
+ } else
+ break;
+ }
+
+ if (i == 0)
+ free(*shmds);
+ return i;
+}
+
+void ipc_shm_free_info(struct shm_data *shmds)
+{
+ while (shmds) {
+ struct shm_data *next = shmds->next;
+ free(shmds);
+ shmds = next;
+ }
+}
+
+static void get_sem_elements(struct sem_data *p)
+{
+ size_t i;
+
+ if (!p || !p->sem_nsems || p->sem_perm.id < 0)
+ return;
+
+ p->elements = xcalloc(p->sem_nsems, sizeof(struct sem_elem));
+
+ for (i = 0; i < p->sem_nsems; i++) {
+ struct sem_elem *e = &p->elements[i];
+ union semun arg = { .val = 0 };
+
+ e->semval = semctl(p->sem_perm.id, i, GETVAL, arg);
+ if (e->semval < 0)
+ err(EXIT_FAILURE, _("%s failed"), "semctl(GETVAL)");
+
+ e->ncount = semctl(p->sem_perm.id, i, GETNCNT, arg);
+ if (e->ncount < 0)
+ err(EXIT_FAILURE, _("%s failed"), "semctl(GETNCNT)");
+
+ e->zcount = semctl(p->sem_perm.id, i, GETZCNT, arg);
+ if (e->zcount < 0)
+ err(EXIT_FAILURE, _("%s failed"), "semctl(GETZCNT)");
+
+ e->pid = semctl(p->sem_perm.id, i, GETPID, arg);
+ if (e->pid < 0)
+ err(EXIT_FAILURE, _("%s failed"), "semctl(GETPID)");
+ }
+}
+
+int ipc_sem_get_info(int id, struct sem_data **semds)
+{
+ FILE *f;
+ int i = 0, maxid;
+ struct sem_data *p;
+ struct seminfo dummy;
+ union semun arg;
+
+ p = *semds = xcalloc(1, sizeof(struct sem_data));
+ p->next = NULL;
+
+ f = fopen(_PATH_PROC_SYSV_SEM, "r");
+ if (!f)
+ goto sem_fallback;
+
+ while (fgetc(f) != '\n') ; /* skip header */
+
+ while (feof(f) == 0) {
+ if (fscanf(f,
+ "%d %d %o %" SCNu64 " %u %u %u %u %"
+ SCNi64 " %" SCNi64 "\n",
+ &p->sem_perm.key,
+ &p->sem_perm.id,
+ &p->sem_perm.mode,
+ &p->sem_nsems,
+ &p->sem_perm.uid,
+ &p->sem_perm.gid,
+ &p->sem_perm.cuid,
+ &p->sem_perm.cgid,
+ &p->sem_otime,
+ &p->sem_ctime) != 10)
+ continue;
+
+ if (id > -1) {
+ /* ID specified */
+ if (id == p->sem_perm.id) {
+ get_sem_elements(p);
+ i = 1;
+ break;
+ }
+ continue;
+ }
+
+ p->next = xcalloc(1, sizeof(struct sem_data));
+ p = p->next;
+ p->next = NULL;
+ i++;
+ }
+
+ if (i == 0)
+ free(*semds);
+ fclose(f);
+ return i;
+
+ /* Fallback; /proc or /sys file(s) missing. */
+sem_fallback:
+ arg.array = (ushort *) (void *)&dummy;
+ maxid = semctl(0, 0, SEM_INFO, arg);
+
+ for (int j = 0; j <= maxid; j++) {
+ int semid;
+ struct semid_ds semseg;
+ struct ipc_perm *ipcp = &semseg.sem_perm;
+ arg.buf = (struct semid_ds *)&semseg;
+
+ semid = semctl(j, 0, SEM_STAT, arg);
+ if (semid < 0 || (id > -1 && semid != id)) {
+ continue;
+ }
+
+ i++;
+ p->sem_perm.key = ipcp->KEY;
+ p->sem_perm.id = semid;
+ p->sem_perm.mode = ipcp->mode;
+ p->sem_nsems = semseg.sem_nsems;
+ p->sem_perm.uid = ipcp->uid;
+ p->sem_perm.gid = ipcp->gid;
+ p->sem_perm.cuid = ipcp->cuid;
+ p->sem_perm.cgid = ipcp->cuid;
+ p->sem_otime = semseg.sem_otime;
+ p->sem_ctime = semseg.sem_ctime;
+
+ if (id < 0) {
+ p->next = xcalloc(1, sizeof(struct sem_data));
+ p = p->next;
+ p->next = NULL;
+ i++;
+ } else {
+ get_sem_elements(p);
+ break;
+ }
+ }
+
+ if (i == 0)
+ free(*semds);
+ return i;
+}
+
+void ipc_sem_free_info(struct sem_data *semds)
+{
+ while (semds) {
+ struct sem_data *next = semds->next;
+ free(semds->elements);
+ free(semds);
+ semds = next;
+ }
+}
+
+int ipc_msg_get_info(int id, struct msg_data **msgds)
+{
+ FILE *f;
+ int i = 0, maxid;
+ struct msg_data *p;
+ struct msqid_ds dummy;
+ struct msqid_ds msgseg;
+
+ p = *msgds = xcalloc(1, sizeof(struct msg_data));
+ p->next = NULL;
+
+ f = fopen(_PATH_PROC_SYSV_MSG, "r");
+ if (!f)
+ goto msg_fallback;
+
+ while (fgetc(f) != '\n') ; /* skip header */
+
+ while (feof(f) == 0) {
+ if (fscanf(f,
+ "%d %d %o %" SCNu64 " %" SCNu64
+ " %u %u %u %u %u %u %" SCNi64 " %" SCNi64 " %" SCNi64 "\n",
+ &p->msg_perm.key,
+ &p->msg_perm.id,
+ &p->msg_perm.mode,
+ &p->q_cbytes,
+ &p->q_qnum,
+ &p->q_lspid,
+ &p->q_lrpid,
+ &p->msg_perm.uid,
+ &p->msg_perm.gid,
+ &p->msg_perm.cuid,
+ &p->msg_perm.cgid,
+ &p->q_stime,
+ &p->q_rtime,
+ &p->q_ctime) != 14)
+ continue;
+
+ if (id > -1) {
+ /* ID specified */
+ if (id == p->msg_perm.id) {
+ if (msgctl(id, IPC_STAT, &msgseg) != -1)
+ p->q_qbytes = msgseg.msg_qbytes;
+ i = 1;
+ break;
+ }
+ continue;
+ }
+
+ p->next = xcalloc(1, sizeof(struct msg_data));
+ p = p->next;
+ p->next = NULL;
+ i++;
+ }
+
+ if (i == 0)
+ free(*msgds);
+ fclose(f);
+ return i;
+
+ /* Fallback; /proc or /sys file(s) missing. */
+msg_fallback:
+ maxid = msgctl(0, MSG_INFO, &dummy);
+
+ for (int j = 0; j <= maxid; j++) {
+ int msgid;
+ struct ipc_perm *ipcp = &msgseg.msg_perm;
+
+ msgid = msgctl(j, MSG_STAT, &msgseg);
+ if (msgid < 0 || (id > -1 && msgid != id)) {
+ continue;
+ }
+
+ i++;
+ p->msg_perm.key = ipcp->KEY;
+ p->msg_perm.id = msgid;
+ p->msg_perm.mode = ipcp->mode;
+ p->q_cbytes = msgseg.msg_cbytes;
+ p->q_qnum = msgseg.msg_qnum;
+ p->q_lspid = msgseg.msg_lspid;
+ p->q_lrpid = msgseg.msg_lrpid;
+ p->msg_perm.uid = ipcp->uid;
+ p->msg_perm.gid = ipcp->gid;
+ p->msg_perm.cuid = ipcp->cuid;
+ p->msg_perm.cgid = ipcp->cgid;
+ p->q_stime = msgseg.msg_stime;
+ p->q_rtime = msgseg.msg_rtime;
+ p->q_ctime = msgseg.msg_ctime;
+ p->q_qbytes = msgseg.msg_qbytes;
+
+ if (id < 0) {
+ p->next = xcalloc(1, sizeof(struct msg_data));
+ p = p->next;
+ p->next = NULL;
+ } else
+ break;
+ }
+
+ if (i == 0)
+ free(*msgds);
+ return i;
+}
+
+void ipc_msg_free_info(struct msg_data *msgds)
+{
+ while (msgds) {
+ struct msg_data *next = msgds->next;
+ free(msgds);
+ msgds = next;
+ }
+}
+
+void ipc_print_perms(FILE *f, struct ipc_stat *is)
+{
+ struct passwd *pw;
+ struct group *gr;
+
+ fprintf(f, "%-10d %-10o", is->id, is->mode & 0777);
+
+ if ((pw = getpwuid(is->cuid)))
+ fprintf(f, " %-10s", pw->pw_name);
+ else
+ fprintf(f, " %-10u", is->cuid);
+
+ if ((gr = getgrgid(is->cgid)))
+ fprintf(f, " %-10s", gr->gr_name);
+ else
+ fprintf(f, " %-10u", is->cgid);
+
+ if ((pw = getpwuid(is->uid)))
+ fprintf(f, " %-10s", pw->pw_name);
+ else
+ fprintf(f, " %-10u", is->uid);
+
+ if ((gr = getgrgid(is->gid)))
+ fprintf(f, " %-10s\n", gr->gr_name);
+ else
+ fprintf(f, " %-10u\n", is->gid);
+}
+
+void ipc_print_size(int unit, char *msg, uint64_t size, const char *end,
+ int width)
+{
+ char format[32];
+
+ if (!msg)
+ /* NULL */ ;
+ else if (msg[strlen(msg) - 1] == '=')
+ printf("%s", msg);
+ else if (unit == IPC_UNIT_BYTES)
+ printf(_("%s (bytes) = "), msg);
+ else if (unit == IPC_UNIT_KB)
+ printf(_("%s (kbytes) = "), msg);
+ else
+ printf("%s = ", msg);
+
+ switch (unit) {
+ case IPC_UNIT_DEFAULT:
+ case IPC_UNIT_BYTES:
+ sprintf(format, "%%%dju", width);
+ printf(format, size);
+ break;
+ case IPC_UNIT_KB:
+ sprintf(format, "%%%dju", width);
+ printf(format, size / 1024);
+ break;
+ case IPC_UNIT_HUMAN:
+ {
+ char *tmp;
+ sprintf(format, "%%%ds", width);
+ printf(format, (tmp = size_to_human_string(SIZE_SUFFIX_1LETTER, size)));
+ free(tmp);
+ break;
+ }
+ default:
+ /* impossible occurred */
+ abort();
+ }
+
+ if (end)
+ printf("%s", end);
+}