?? shmcreate.c
字號:
#include "unpipc.h"
int
main(int argc, char **argv)
{
int c, fd, flags;
char *ptr;
off_t length;
flags = O_RDWR | O_CREAT;
while ( (c = Getopt(argc, argv, "e")) != -1) {
switch (c) {
case 'e':
flags |= O_EXCL;
break;
}
}
if (optind != argc - 2)
err_quit("usage: shmcreate [ -e ] <name> <length>");
length = atoi(argv[optind + 1]);
fd = Shm_open(argv[optind], flags, FILE_MODE);
Ftruncate(fd, length);
ptr = Mmap(NULL, length, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
exit(0);
}
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