1 /* SPDX-License-Identifier: MIT */ 2 /* 3 * os-wasm.c 4 * Forked from os-posix.c, removing functions not working on Emscripten 5 * 6 * Copyright (c) 2003-2008 Fabrice Bellard 7 * Copyright (c) 2010 Red Hat, Inc. 8 * 9 * Permission is hereby granted, free of charge, to any person obtaining a copy 10 * of this software and associated documentation files (the "Software"), to deal 11 * in the Software without restriction, including without limitation the rights 12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 13 * copies of the Software, and to permit persons to whom the Software is 14 * furnished to do so, subject to the following conditions: 15 * 16 * The above copyright notice and this permission notice shall be included in 17 * all copies or substantial portions of the Software. 18 * 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 22 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 24 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 25 * THE SOFTWARE. 26 */ 27 28 #include "qemu/osdep.h" 29 #include <sys/resource.h> 30 #include <sys/wait.h> 31 #include <pwd.h> 32 #include <grp.h> 33 #include <libgen.h> 34 35 #include "qemu/error-report.h" 36 #include "qemu/log.h" 37 #include "system/runstate.h" 38 #include "qemu/cutils.h" 39 40 void os_setup_post(void){} 41 void os_set_line_buffering(void) 42 { 43 setvbuf(stdout, NULL, _IOLBF, 0); 44 } 45 void os_setup_early_signal_handling(void) 46 { 47 struct sigaction act; 48 sigfillset(&act.sa_mask); 49 act.sa_flags = 0; 50 act.sa_handler = SIG_IGN; 51 sigaction(SIGPIPE, &act, NULL); 52 } 53 void os_set_proc_name(const char *s) 54 { 55 error_report("Change of process name not supported by your OS"); 56 exit(1); 57 } 58 static void termsig_handler(int signal, siginfo_t *info, void *c) 59 { 60 qemu_system_killed(info->si_signo, info->si_pid); 61 } 62 63 void os_setup_signal_handling(void) 64 { 65 struct sigaction act; 66 67 memset(&act, 0, sizeof(act)); 68 act.sa_sigaction = termsig_handler; 69 act.sa_flags = SA_SIGINFO; 70 sigaction(SIGINT, &act, NULL); 71 sigaction(SIGHUP, &act, NULL); 72 sigaction(SIGTERM, &act, NULL); 73 } 74 void os_setup_limits(void) 75 { 76 struct rlimit nofile; 77 78 if (getrlimit(RLIMIT_NOFILE, &nofile) < 0) { 79 warn_report("unable to query NOFILE limit: %s", strerror(errno)); 80 return; 81 } 82 83 if (nofile.rlim_cur == nofile.rlim_max) { 84 return; 85 } 86 87 nofile.rlim_cur = nofile.rlim_max; 88 89 if (setrlimit(RLIMIT_NOFILE, &nofile) < 0) { 90 warn_report("unable to set NOFILE limit: %s", strerror(errno)); 91 return; 92 } 93 } 94 int os_mlock(bool on_fault) 95 { 96 #ifdef HAVE_MLOCKALL 97 int ret = 0; 98 int flags = MCL_CURRENT | MCL_FUTURE; 99 100 if (on_fault) { 101 #ifdef HAVE_MLOCK_ONFAULT 102 flags |= MCL_ONFAULT; 103 #else 104 error_report("mlockall: on_fault not supported"); 105 return -EINVAL; 106 #endif 107 } 108 109 ret = mlockall(flags); 110 if (ret < 0) { 111 error_report("mlockall: %s", strerror(errno)); 112 } 113 114 return ret; 115 #else 116 (void)on_fault; 117 return -ENOSYS; 118 #endif 119 } 120