1 /* 2 * This file and its contents are supplied under the terms of the 3 * Common Development and Distribution License ("CDDL"), version 1.0. 4 * You may only use this file in accordance with the terms of version 5 * 1.0 of the CDDL. 6 * 7 * A full copy of the text of the CDDL should have accompanied this 8 * source. A copy of the CDDL is also available via the Internet at 9 * http://www.illumos.org/license/CDDL. 10 */ 11 12 /* 13 * Copyright (c) 2015, Joyent, Inc. 14 */ 15 16 /* 17 * Verify that using MC_INHERIT_ZERO works just fine when applied to an entire 18 * region that then gets split in half, hence creating new segments. 19 */ 20 21 #include <sys/types.h> 22 #include <unistd.h> 23 #include <assert.h> 24 #include <sys/mman.h> 25 #include <string.h> 26 #include <errno.h> 27 #include <stdlib.h> 28 #include <wait.h> 29 30 int 31 main(void) 32 { 33 void *buf; 34 pid_t child; 35 int ret, i; 36 siginfo_t info; 37 uint8_t *ubuf; 38 size_t mapsz = sysconf(_SC_PAGESIZE) * 8; 39 size_t spltsz = sysconf(_SC_PAGESIZE) * 4; 40 size_t spltoff = sysconf(_SC_PAGESIZE) * 2; 41 42 buf = mmap(NULL, mapsz, PROT_READ | PROT_WRITE, 43 MAP_PRIVATE | MAP_ANON, -1, 0); 44 assert(buf != MAP_FAILED); 45 memset(buf, 'a', mapsz); 46 47 ret = memcntl(buf, mapsz, MC_INHERIT_ZERO, 0, 0, 0); 48 assert(ret == 0); 49 50 ret = munmap(buf + spltoff, spltsz); 51 assert(ret == 0); 52 53 child = fork(); 54 if (child == 0) { 55 ubuf = buf; 56 for (i = 0; i < spltoff; i++) 57 assert(ubuf[i] == 0); 58 for (i = spltoff + spltsz; i < mapsz; i++) 59 assert(ubuf[i] == 0); 60 exit(0); 61 } 62 assert(child != -1); 63 64 do { 65 ret = waitid(P_PID, child, &info, WEXITED); 66 } while (ret == -1 && errno == EINTR); 67 assert(ret == 0); 68 assert(info.si_pid == child); 69 assert(info.si_status == 0); 70 71 ubuf = buf; 72 for (i = 0; i < spltoff; i++) 73 assert(ubuf[i] == 'a'); 74 for (i = spltoff + spltsz; i < mapsz; i++) 75 assert(ubuf[i] == 'a'); 76 77 return (0); 78 } 79