?? msgrcv.c
字號:
#include "unpipc.h"
#define MAXMSG (8192 + sizeof(long))
int
main(int argc, char **argv)
{
int c, flag, mqid;
long type;
ssize_t n;
struct msgbuf *buff;
type = flag = 0;
while ( (c = Getopt(argc, argv, "nt:")) != -1) {
switch (c) {
case 'n':
flag |= IPC_NOWAIT;
break;
case 't':
type = atol(optarg);
break;
}
}
if (optind != argc - 1)
err_quit("usage: msgrcv [ -n ] [ -t type ] <pathname>");
mqid = Msgget(Ftok(argv[optind], 0), MSG_R);
buff = Malloc(MAXMSG);
n = Msgrcv(mqid, buff, MAXMSG, type, flag);
printf("read %d bytes, type = %ld\n", n, buff->mtype);
exit(0);
}
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