example27.c

Linux网络编程教程适合初学者入门学习

#include 	<stdlib.h>
#include	<sys/types.h>
#include	<sys/ipc.h>
#include	<sys/shm.h>

#define		SVSHM_MODE	(SHM_R | SHM_W | SHM_R >> 3 | SHM_R >> 6)

int
main(int argc, char **argv)
{
	int		id;
	char		*ptr;
	size_t 		length;
	
	if ( argc < 2)
		printf("usage: shmcreate <pathname> <length>");

	length = atoi(argv[2]);
	id = shmget(ftok(argv[1], 0), length, SVSHM_MODE | IPC_CREAT);
	ptr = shmat(id, NULL, 0);
	exit(0);
}