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 a subset of 18 * a region, meaning that we should have created a struct vpage for that region. 19 * Then unmap a hole in the middle, so that way we force subsets of children 20 * that have struct vpage entries. 21 */ 22 23 #include <sys/types.h> 24 #include <unistd.h> 25 #include <assert.h> 26 #include <sys/mman.h> 27 #include <string.h> 28 #include <errno.h> 29 #include <stdlib.h> 30 #include <wait.h> 31 32 int 33 main(void) 34 { 35 void *buf; 36 pid_t child; 37 int ret, i; 38 siginfo_t info; 39 uint8_t *ubuf; 40 size_t pgsz = sysconf(_SC_PAGESIZE); 41 size_t mapsz = 10 * pgsz; 42 size_t clrsz = 5 * pgsz; 43 size_t clroff = 2 * pgsz; 44 size_t spltsz = 1 * pgsz; 45 size_t spltoff = 3 * pgsz; 46 47 buf = mmap(NULL, mapsz, PROT_READ | PROT_WRITE, 48 MAP_PRIVATE | MAP_ANON, -1, 0); 49 assert(buf != MAP_FAILED); 50 memset(buf, 'a', mapsz); 51 52 ret = memcntl(buf + clroff, clrsz, MC_INHERIT_ZERO, 0, 0, 0); 53 assert(ret == 0); 54 55 ret = munmap(buf + spltoff, spltsz); 56 assert(ret == 0); 57 58 child = fork(); 59 if (child == 0) { 60 ubuf = buf; 61 for (i = 0; i < clroff; i++) 62 assert(ubuf[i] == 'a'); 63 for (i = clroff; i < spltoff; i++) 64 assert(ubuf[i] == 0); 65 for (i = spltoff + spltsz; i < clroff + clrsz; i++) 66 assert(ubuf[i] == 0); 67 for (i = clrsz + clroff; i < mapsz; i++) 68 assert(ubuf[i] == 'a'); 69 exit(0); 70 } 71 assert(child != -1); 72 73 do { 74 ret = waitid(P_PID, child, &info, WEXITED); 75 } while (ret == -1 && errno == EINTR); 76 assert(ret == 0); 77 assert(info.si_pid == child); 78 assert(info.si_status == 0); 79 80 ubuf = buf; 81 for (i = 0; i < clroff; i++) 82 assert(ubuf[i] == 'a'); 83 for (i = clroff; i < spltoff; i++) 84 assert(ubuf[i] == 'a'); 85 for (i = spltoff + spltsz; i < clroff + clrsz; i++) 86 assert(ubuf[i] == 'a'); 87 for (i = clrsz + clroff; i < mapsz; i++) 88 assert(ubuf[i] == 'a'); 89 90 91 return (0); 92 } 93