LXR qemu/os-wasm.c

   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
  40void os_setup_post(void){}
  41void os_set_line_buffering(void)
  42{
  43    setvbuf(stdout, NULL, _IOLBF, 0);
  44}
  45void 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}
  53void os_set_proc_name(const char *s)
  54{
  55    error_report("Change of process name not supported by your OS");
  56    exit(1);
  57}
  58static void termsig_handler(int signal, siginfo_t *info, void *c)
  59{
  60    qemu_system_killed(info->si_signo, info->si_pid);
  61}
  62
  63void 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}
  74void 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}
  94int 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