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#include <inttypes.h>
#include "c.h"
#include "xalloc.h"
#include "path.h"
#include "pathnames.h"
#include "ipcutils.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 (path_exist(_PATH_PROC_IPC_MSGMNI) &&
path_exist(_PATH_PROC_IPC_MSGMNB) &&
path_exist(_PATH_PROC_IPC_MSGMAX)) {
lim->msgmni = path_read_s32(_PATH_PROC_IPC_MSGMNI);
lim->msgmnb = path_read_s32(_PATH_PROC_IPC_MSGMNB);
lim->msgmax = path_read_s32(_PATH_PROC_IPC_MSGMAX);
} 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 = path_fopen("r", 0, _PATH_PROC_IPC_SEM);
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;
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 (path_exist(_PATH_PROC_IPC_SHMALL) &&
path_exist(_PATH_PROC_IPC_SHMMAX) &&
path_exist(_PATH_PROC_IPC_SHMMNI)) {
lim->shmall = path_read_u64(_PATH_PROC_IPC_SHMALL);
lim->shmmax = path_read_u64(_PATH_PROC_IPC_SHMMAX);
lim->shmmni = path_read_u64(_PATH_PROC_IPC_SHMMNI);
} else {
struct shminfo shminfo;
if (shmctl(0, IPC_INFO, (struct shmid_ds *) &shminfo) < 0)
return 1;
lim->shmmni = shminfo.shmmni;
lim->shmall = shminfo.shmall;
}
return 0;
}
int ipc_shm_get_info(int id, struct shm_data **shmds)
{
FILE *f;
int i, maxid;
struct shm_data *p;
struct shm_info dummy;
p = *shmds = xmalloc(sizeof(struct shm_data));
p->next = NULL;
f = path_fopen("r", 0, _PATH_PROC_SYSV_SHM);
if (!f)
goto fallback;
while (fgetc(f) != '\n'); /* skip header */
for (i = 0; !feof(f); i++) {
if (fscanf(f,
"%d %d %o %"SCNu64 " %u %u "
"%"SCNu64 " %u %u %u %u %"SCNu64 " %"SCNu64 " %"SCNu64
" %"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) != 16)
continue;
if (id > -1 && id != p->shm_perm.id) {
i--;
continue; /* id specified, but does not match */
}
if (id < 0) {
p->next = xmalloc(sizeof(struct shm_data));
p = p->next;
p->next = NULL;
}
}
if (i == 0)
free(*shmds);
fclose(f);
return i;
/* Fallback; /proc or /sys file(s) missing. */
fallback:
i = id < 0 ? 0 : id;
maxid = shmctl(0, SHM_INFO, (struct shmid_ds *) &dummy);
if (maxid < 0)
return 0;
while (i <= maxid) {
int shmid;
struct shmid_ds shmseg;
struct ipc_perm *ipcp = &shmseg.shm_perm;
shmid = shmctl(i, SHM_STAT, &shmseg);
if (shmid < 0) {
if (-1 < id) {
free(*shmds);
return 0;
}
i++;
continue;
}
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 = xmalloc(sizeof(struct shm_data));
p = p->next;
p->next = NULL;
i++;
} else
return 1;
}
return i;
}
void ipc_shm_free_info(struct shm_data *shmds)
{
while (shmds) {
struct shm_data *next = shmds->next;
free(shmds);
shmds = 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);
}
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