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
os_setup_post(void)40 void os_setup_post(void){}
os_set_line_buffering(void)41 void os_set_line_buffering(void)
42 {
43 setvbuf(stdout, NULL, _IOLBF, 0);
44 }
os_setup_early_signal_handling(void)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 }
os_set_proc_name(const char * s)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 }
termsig_handler(int signal,siginfo_t * info,void * c)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
os_setup_signal_handling(void)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 }
os_setup_limits(void)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 }
os_mlock(bool on_fault)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