File: sysmsg.c

package info (click to toggle)
llvm-toolchain-18 1%3A18.1.8-20
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 1,909,296 kB
  • sloc: cpp: 6,667,975; ansic: 1,440,452; asm: 883,619; python: 230,549; objc: 76,880; f90: 74,238; lisp: 35,989; pascal: 16,571; sh: 10,229; perl: 7,459; ml: 5,047; awk: 3,523; makefile: 2,992; javascript: 2,149; xml: 892; fortran: 649; cs: 573
file content (39 lines) | stat: -rw-r--r-- 948 bytes parent folder | download | duplicates (26) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
 
// RUN: %clang -O1 %s -o %t && %run %t
// UNSUPPORTED: android
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/msg.h>

#define CHECK_STRING "hello, world!"
#define MSG_BUFLEN 0x100

int main() {
  int msgq = msgget(IPC_PRIVATE, 0666);
  if (msgq == -1) perror("msgget:");
  assert(msgq != -1);

  struct msg_s {
    long mtype;
    char string[MSG_BUFLEN];
  };

  struct msg_s msg = {
      .mtype = 1};
  strcpy(msg.string, CHECK_STRING);
  int res = msgsnd(msgq, &msg, MSG_BUFLEN, IPC_NOWAIT);
  if (res) {
    fprintf(stderr, "Error sending message! %s\n", strerror(errno));
    msgctl(msgq, IPC_RMID, NULL);
    return -1;
  }

  struct msg_s rcv_msg;
  ssize_t len = msgrcv(msgq, &rcv_msg, MSG_BUFLEN, msg.mtype, IPC_NOWAIT);
  assert(len == MSG_BUFLEN);
  assert(msg.mtype == rcv_msg.mtype);
  assert(!memcmp(msg.string, rcv_msg.string, MSG_BUFLEN));
  msgctl(msgq, IPC_RMID, NULL);
  return 0;
}