1*9d12795fSRobert Mustacchi /* 2*9d12795fSRobert Mustacchi * This file and its contents are supplied under the terms of the 3*9d12795fSRobert Mustacchi * Common Development and Distribution License ("CDDL"), version 1.0. 4*9d12795fSRobert Mustacchi * You may only use this file in accordance with the terms of version 5*9d12795fSRobert Mustacchi * 1.0 of the CDDL. 6*9d12795fSRobert Mustacchi * 7*9d12795fSRobert Mustacchi * A full copy of the text of the CDDL should have accompanied this 8*9d12795fSRobert Mustacchi * source. A copy of the CDDL is also available via the Internet at 9*9d12795fSRobert Mustacchi * http://www.illumos.org/license/CDDL. 10*9d12795fSRobert Mustacchi */ 11*9d12795fSRobert Mustacchi 12*9d12795fSRobert Mustacchi /* 13*9d12795fSRobert Mustacchi * Copyright (c) 2015, Joyent, Inc. 14*9d12795fSRobert Mustacchi */ 15*9d12795fSRobert Mustacchi 16*9d12795fSRobert Mustacchi /* 17*9d12795fSRobert Mustacchi * Verify that using MC_INHERIT_ZERO works just fine when applied to an entire 18*9d12795fSRobert Mustacchi * region across multiple children. 19*9d12795fSRobert Mustacchi */ 20*9d12795fSRobert Mustacchi 21*9d12795fSRobert Mustacchi #include <sys/types.h> 22*9d12795fSRobert Mustacchi #include <unistd.h> 23*9d12795fSRobert Mustacchi #include <assert.h> 24*9d12795fSRobert Mustacchi #include <sys/mman.h> 25*9d12795fSRobert Mustacchi #include <string.h> 26*9d12795fSRobert Mustacchi #include <errno.h> 27*9d12795fSRobert Mustacchi #include <stdlib.h> 28*9d12795fSRobert Mustacchi #include <wait.h> 29*9d12795fSRobert Mustacchi 30*9d12795fSRobert Mustacchi static int nchild = 5; 31*9d12795fSRobert Mustacchi 32*9d12795fSRobert Mustacchi int 33*9d12795fSRobert Mustacchi main(void) 34*9d12795fSRobert Mustacchi { 35*9d12795fSRobert Mustacchi void *buf; 36*9d12795fSRobert Mustacchi pid_t child; 37*9d12795fSRobert Mustacchi int ret, i; 38*9d12795fSRobert Mustacchi siginfo_t info; 39*9d12795fSRobert Mustacchi uint8_t *ubuf; 40*9d12795fSRobert Mustacchi size_t mapsz = sysconf(_SC_PAGESIZE) * 2; 41*9d12795fSRobert Mustacchi 42*9d12795fSRobert Mustacchi buf = mmap(NULL, mapsz, PROT_READ | PROT_WRITE, 43*9d12795fSRobert Mustacchi MAP_PRIVATE | MAP_ANON, -1, 0); 44*9d12795fSRobert Mustacchi assert(buf != MAP_FAILED); 45*9d12795fSRobert Mustacchi 46*9d12795fSRobert Mustacchi ret = memcntl(buf, mapsz, MC_INHERIT_ZERO, 0, 0, 0); 47*9d12795fSRobert Mustacchi assert(ret == 0); 48*9d12795fSRobert Mustacchi 49*9d12795fSRobert Mustacchi again: 50*9d12795fSRobert Mustacchi memset(buf, 'a' + nchild, mapsz); 51*9d12795fSRobert Mustacchi child = fork(); 52*9d12795fSRobert Mustacchi if (child == 0) { 53*9d12795fSRobert Mustacchi nchild--; 54*9d12795fSRobert Mustacchi for (i = 0, ubuf = buf; i < mapsz; i++) 55*9d12795fSRobert Mustacchi assert(ubuf[i] == 0); 56*9d12795fSRobert Mustacchi if (nchild != 0) 57*9d12795fSRobert Mustacchi goto again; 58*9d12795fSRobert Mustacchi exit(0); 59*9d12795fSRobert Mustacchi } 60*9d12795fSRobert Mustacchi assert(child != -1); 61*9d12795fSRobert Mustacchi 62*9d12795fSRobert Mustacchi do { 63*9d12795fSRobert Mustacchi ret = waitid(P_PID, child, &info, WEXITED); 64*9d12795fSRobert Mustacchi } while (ret == -1 && errno == EINTR); 65*9d12795fSRobert Mustacchi assert(ret == 0); 66*9d12795fSRobert Mustacchi assert(info.si_pid == child); 67*9d12795fSRobert Mustacchi assert(info.si_status == 0); 68*9d12795fSRobert Mustacchi 69*9d12795fSRobert Mustacchi for (i = 0, ubuf = buf; i < mapsz; i++) 70*9d12795fSRobert Mustacchi assert(ubuf[i] == 'a' + nchild); 71*9d12795fSRobert Mustacchi 72*9d12795fSRobert Mustacchi return (0); 73*9d12795fSRobert Mustacchi } 74