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/*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Copyright (C) 2012 Sami Kerola <kerolasa@iki.fi>
* Copyright (C) 2012-2023 Karel Zak <kzak@redhat.com>
*/
#ifndef UTIL_LINUX_IPCUTILS_H
#define UTIL_LINUX_IPCUTILS_H
#include <stdio.h>
#include <stdlib.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/sem.h>
#include <sys/shm.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include <grp.h>
#include <pwd.h>
#include <stdint.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;
unsigned long shm_tot; /* total allocated shm */
unsigned long shm_rss; /* total resident shm */
unsigned long shm_swp; /* total swapped shm */
unsigned long swap_attempts;
unsigned long 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.
* */
#ifndef HAVE_UNION_SEMUN
/* 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;
* glibc-1.09 has no support for sysv ipc.
* glibc 2 uses __key, __seq
*/
#if defined (__GLIBC__) && __GLIBC__ >= 2
# define KEY __key
#else
# define KEY key
#endif
/* Size printing in ipcs is using these. */
enum {
IPC_UNIT_DEFAULT,
IPC_UNIT_BYTES,
IPC_UNIT_KB,
IPC_UNIT_HUMAN
};
struct ipc_limits {
uint64_t shmmni; /* max number of segments */
uint64_t shmmax; /* max segment size */
uint64_t shmall; /* max total shared memory */
uint64_t shmmin; /* min segment size */
int semmni; /* max number of arrays */
int semmsl; /* max semaphores per array */
int semmns; /* max semaphores system wide */
int semopm; /* max ops per semop call */
unsigned int semvmx; /* semaphore max value (constant) */
int msgmni; /* max queues system wide */
uint64_t msgmax; /* max size of message */
int msgmnb; /* default max size of queue */
};
extern int ipc_msg_get_limits(struct ipc_limits *lim);
extern int ipc_sem_get_limits(struct ipc_limits *lim);
extern int ipc_shm_get_limits(struct ipc_limits *lim);
struct ipc_stat {
int id;
key_t key;
uid_t uid; /* current uid */
gid_t gid; /* current gid */
uid_t cuid; /* creator uid */
gid_t cgid; /* creator gid */
unsigned int mode;
};
extern void ipc_print_perms(FILE *f, struct ipc_stat *is);
extern void ipc_print_size(int unit, char *msg, uint64_t size, const char *end, int width);
/* See 'struct shmid_kernel' in kernel sources
*/
struct shm_data {
struct ipc_stat shm_perm;
uint64_t shm_nattch;
uint64_t shm_segsz;
int64_t shm_atim; /* __kernel_time_t is signed long */
int64_t shm_dtim;
int64_t shm_ctim;
pid_t shm_cprid;
pid_t shm_lprid;
uint64_t shm_rss;
uint64_t shm_swp;
struct shm_data *next;
};
extern int ipc_shm_get_info(int id, struct shm_data **shmds);
extern void ipc_shm_free_info(struct shm_data *shmds);
/* See 'struct sem_array' in kernel sources
*/
struct sem_elem {
int semval;
int ncount; /* processes waiting on increase semval */
int zcount; /* processes waiting on semval set to zero */
pid_t pid; /* process last executed semop(2) call */
};
struct sem_data {
struct ipc_stat sem_perm;
int64_t sem_ctime;
int64_t sem_otime;
uint64_t sem_nsems;
struct sem_elem *elements;
struct sem_data *next;
};
extern int ipc_sem_get_info(int id, struct sem_data **semds);
extern void ipc_sem_free_info(struct sem_data *semds);
/* See 'struct msg_queue' in kernel sources
*/
struct msg_data {
struct ipc_stat msg_perm;
int64_t q_stime;
int64_t q_rtime;
int64_t q_ctime;
uint64_t q_cbytes;
uint64_t q_qnum;
uint64_t q_qbytes;
pid_t q_lspid;
pid_t q_lrpid;
struct msg_data *next;
};
extern int ipc_msg_get_info(int id, struct msg_data **msgds);
extern void ipc_msg_free_info(struct msg_data *msgds);
#endif /* UTIL_LINUX_IPCUTILS_H */
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