shmget.c

让你了解Unix进程间的通信是如何实现的

#include	"unpipc.h"

int
main(int argc, char **argv)
{
	int		c, id, oflag;
	char	*ptr;
	size_t	length;

	oflag = SVSHM_MODE | IPC_CREAT;
	while ( (c = Getopt(argc, argv, "e")) != -1) {
		switch (c) {
		case 'e':
			oflag |= IPC_EXCL;
			break;
		}
	}
	if (optind != argc - 2)
		err_quit("usage: shmget [ -e ] <pathname> <length>");
	length = atoi(argv[optind + 1]);

	id = Shmget(Ftok(argv[optind], 0), length, oflag);
	ptr = Shmat(id, NULL, 0);

	exit(0);
}