dcorreia/process_8h.html

#include <sys/shm.h>
...
int shmid;
// creation:
shmid = pshmget(key, size, 0600 | IPC_CREAT | IPC_EXCL);
// or, use existing:
shmid = pshmget(key, 0, 0);
...
// attach shm to pointer address:
void* p = pshmat(shmid, NULL, 0);
...
// detach shm from pointer address:
pshmdt(p);
...
// destroy shm:
pshmctl(shmid, IPC_RMID, NULL);
Functions
Process handling

pid_t	pfork (void)
	`fork` wrapper function. More...

pid_t	pwait (int *status)
	`wait` wrapper function. More...

pid_t	pwaitpid (pid_t pid, int *status, int options)
	`waitpid` wrapper function. More...

System V - shared memory
Example #include <sys/shm.h> ... int shmid; // creation: shmid = pshmget(key, size, 0600 \| IPC_CREAT \| IPC_EXCL); // or, use existing: shmid = pshmget(key, 0, 0); ... // attach shm to pointer address: void* p = pshmat(shmid, NULL, 0); ... // detach shm from pointer address: pshmdt(p); ... // destroy shm: pshmctl(shmid, IPC_RMID, NULL);
int	pshmget (key_t key, size_t size, int shmflg)
	`shmget` wrapper function. More...

int	pshmctl (int shmid, int cmd, struct shmid_ds *buf)
	`shmctl` wrapper function. More...

void *	pshmat (int shmid, const void *shmaddr, int shmflg)
	`shmat` wrapper function. More...

void	pshmdt (const void *shmaddr)
	`shmdt` wrapper function. More...

System V - semaphores
Example #include <sys/sem.h> ... int semid; // creation: semid = psemget(key, 1, 0600 \| IPC_CREAT \| IPC_EXCL); // 1 semaphore! // or, use existing: semid = psemget(key, 0, 0); ... // lock: struct sembuf down = {0, -1, 0}; psemop(semid, &down, 1); // or, simply use provided function: psem_down(semid, 0); ... //unlock: struct sembuf up = {0, 1, 0}; psemop(semid, &up, 1); // or, simply use provided function: psem_up(semid, 0); ... // destroy sem 0: psemctl(semid, 0, IPC_RMID, NULL);
int	psemget (key_t key, int nsems, int semflg)
	`semget` wrapper function. More...

int	psemctl (int semid, int semnum, int cmd)
	`semctl` wrapper function. More...

int	psemctl (int semid, int semnum, int cmd, void *u)

void	psemop (int semid, struct sembuf *sops, size_t nsops)
	`semop` wrapper function. More...

void	psem_up (int semid, short unsigned int index)
	Increment a semaphore (uses psemop()).

void	psem_down (int semid, short unsigned int index)
	Decrements a semaphore (uses psemop()).

System V - message queues
Example #include <sys/msg.h> ... typedef struct Item { ... } Item; typedef struct Message { long type; Item item; } Message; ... int msgid; // creation: msgid = pmsgget(key, 0600 \| IPC_CREAT \| IPC_EXCL); // or, use existing: msgid = pmsgget(key, 0); ... Message msg; // send msg: msg = ...; pmsgsnd(msgid, &msg, sizeof(Item), 0); ... // receive msg: pmsgrcv(msgid, &msg, sizeof(Item), type, 0); ... // destroy msg: pmsgctl(msgid, IPC_RMID, NULL);
int	pmsgget (key_t key, int msgflg)
	`msgget` wrapper function. More...

int	pmsgctl (int msqid, int cmd, struct msqid_ds *buf)
	`msgctl` wrapper function. More...

void	pmsgsnd (int msqid, const void *msgp, size_t msgsz, int msgflg)
	`msgsnd` wrapper function. More...

size_t	pmsgrcv (int msqid, void *msgp, size_t msgsz, long msgtyp, int msgflg)
	`msgrcv` wrapper function. More...

POSIX semaphores

sem_t *	psem_open (const char *name, int oflag)
	`sem_open` wrapper function. More...

sem_t *	psem_open (const char *name, int oflag, mode_t mode, unsigned int value)

void	psem_close (sem_t *sem)
	`sem_close` wrapper function. More...

void	psem_unlink (const char *name)
	`sem_unlink` wrapper function. More...

void	psem_init (sem_t *sem, int pshared, unsigned int value)
	`sem_init` wrapper function. More...

void	psem_destroy (sem_t *sem)
	`sem_destroy` wrapper function. More...

void	psem_wait (sem_t *sem)
	`sem_wait` wrapper function. More...

int	psem_trywait (sem_t *sem)
	`sem_trywait` wrapper function. More...

int	psem_timedwait (sem_t sem, const struct timespec abs_timeout)
	`sem_timedwait` wrapper function. More...

void	psem_post (sem_t *sem)
	`sem_post` wrapper function. More...