ipcs: clean up do_sem(), and add ipc_sem_get_info()

Signed-off-by: Sami Kerola <kerolasa@iki.fi>

1 files changed, 109 insertions, 0 deletions

diff --git a/sys-utils/ipcutils.c b/sys-utils/ipcutils.c
index 3b52a7e6b..61671c128 100644
--- a/sys-utils/ipcutils.c
+++ b/sys-utils/ipcutils.c
@@ -211,6 +211,115 @@ void ipc_shm_free_info(struct shm_data *shmds)
 	}
 }
 
+int ipc_sem_get_info(int id, struct sem_data **semds)
+{
+	FILE *f;
+	int i, maxid;
+	struct sem_data *p;
+	struct seminfo dummy;
+	union semun arg;
+
+	p = *semds = xcalloc(1, sizeof(struct sem_data));
+	p->next = NULL;
+
+	f = path_fopen("r", 0, _PATH_PROC_SYSV_SEM);
+	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 %" SCNu64 " %" SCNu64 "\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) {
+				i = 1;
+				break;
+			} else
+				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:
+	i = id < 0 ? 0 : id;
+
+	arg.array = (ushort *) (void *)&dummy;
+	maxid = semctl(0, 0, SEM_INFO, arg);
+	if (maxid < 0)
+		return 0;
+
+	while (i <= maxid) {
+		int semid;
+		struct semid_ds semseg;
+		struct ipc_perm *ipcp = &semseg.sem_perm;
+		arg.buf = (struct semid_ds *)&semseg;
+
+		semid = semctl(i, 0, SEM_STAT, arg);
+		if (semid < 0) {
+			if (-1 < id) {
+				free(*semds);
+				return 0;
+			}
+			i++;
+			continue;
+		}
+
+		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
+			return 1;
+	}
+
+	return i;
+}
+
+void ipc_sem_free_info(struct sem_data *semds)
+{
+	while (semds) {
+		struct sem_data *next = semds->next;
+		free(semds);
+		semds = next;
+	}
+}
+
 void ipc_print_perms(FILE *f, struct ipc_stat *is)
 {
 	struct passwd *pw;