diff options
Diffstat (limited to 'sys-utils/ipcutils.h')
| -rw-r--r-- | sys-utils/ipcutils.h | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/sys-utils/ipcutils.h b/sys-utils/ipcutils.h new file mode 100644 index 0000000..db85f57 --- /dev/null +++ b/sys-utils/ipcutils.h @@ -0,0 +1,187 @@ +#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 */ |