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sys-utils/ipcutils.h
255 строк
6 KB
Prasanna Paithankar
Defined macros for POSIX IPC compilation and removed path buffer.
10 фев 2025, 22:37
10 фев 2025, 22:37
ff5e642
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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> #ifdef HAVE_MQUEUE_H #include <mqueue.h> #endif #ifdef HAVE_SEMAPHORE_H #include <semaphore.h> #endif /* * 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 { /* System V IPC */ 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 */ /* POSIX IPC */ uint64_t msgmax_posix; /* max size of message */ uint64_t msgmni_posix; /* max queues system wide */ uint64_t msgmnb_posix; /* default max number of messages in a 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); struct posix_shm_data { char *name; int64_t mtime; /* last change time */ uid_t cuid; gid_t cgid; off_t size; unsigned int mode; struct posix_shm_data *next; }; extern int posix_ipc_shm_get_info(const char *name, struct posix_shm_data **shmds); extern void posix_ipc_shm_free_info(struct posix_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); struct posix_sem_data { char *sname; int64_t mtime; /* last change time */ uid_t cuid; gid_t cgid; unsigned int mode; int sval; /* semaphore value */ struct posix_sem_data *next; }; extern int posix_ipc_sem_get_info(const char *name, struct posix_sem_data **semds); extern void posix_ipc_sem_free_info(struct posix_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); struct posix_msg_data { char *mname; int64_t mtime; uid_t cuid; gid_t cgid; unsigned int mode; uint64_t q_cbytes; /* current number of bytes on the queue */ long q_qnum; /* number of messages on the queue */ struct posix_msg_data *next; }; extern int posix_ipc_msg_get_info(const char *name, struct posix_msg_data **msgds); extern void posix_ipc_msg_free_info(struct posix_msg_data *msgds); #endif /* UTIL_LINUX_IPCUTILS_H */