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include/qemu/osdep.h: Add Emscripten-specific OS dependencies
On emscripten, some implementations in os-posix.c can't be used such as daemonizing and changing user. This commit introduces os-wasm.c and os-wasm.h which are forked from os-posix.c and os-posix.h and patched for targetting Emscripten. Signed-off-by: Kohei Tokunaga <ktokunaga.mail@gmail.com> Link: https://lore.kernel.org/r/9fc7b106ecf86675b4532bd6778b7b5945442f89.1745820062.git.ktokunaga.mail@gmail.com Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Kohei Tokunaga
Paolo Bonzini
parent
208808242f
commit
0f46bf659f
4 changed files with 235 additions and 2 deletions
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@ -628,6 +628,12 @@ F: .gitlab-ci.d/cirrus/macos-*
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F: */*.m
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F: scripts/entitlement.sh
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WebAssembly
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M: Kohei Tokunaga <ktokunaga.mail@gmail.com>
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S: Maintained
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F: include/system/os-wasm.h
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F: os-wasm.c
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Alpha Machines
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--------------
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M: Richard Henderson <richard.henderson@linaro.org>
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@ -8,7 +8,7 @@
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* To avoid getting into possible circular include dependencies, this
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* file should not include any other QEMU headers, with the exceptions
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* of config-host.h, config-target.h, qemu/compiler.h,
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* system/os-posix.h, system/os-win32.h, glib-compat.h and
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* system/os-posix.h, system/os-win32.h, system/os-wasm.h, glib-compat.h and
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* qemu/typedefs.h, all of which are doing a similar job to this file
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* and are under similar constraints.
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*
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@ -164,10 +164,14 @@ QEMU_EXTERN_C int daemon(int, int);
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#include "system/os-win32.h"
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#endif
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#ifdef CONFIG_POSIX
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#if defined(CONFIG_POSIX) && !defined(EMSCRIPTEN)
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#include "system/os-posix.h"
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#endif
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#if defined(EMSCRIPTEN)
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#include "system/os-wasm.h"
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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104
include/system/os-wasm.h
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104
include/system/os-wasm.h
Normal file
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@ -0,0 +1,104 @@
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/* SPDX-License-Identifier: MIT */
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/*
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* posix specific declarations forked from os-posix.h, removing functions not
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* working on Emscripten
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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* Copyright (c) 2010 Jes Sorensen <Jes.Sorensen@redhat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef QEMU_OS_WASM_H
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#define QEMU_OS_WASM_H
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#include <sys/mman.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <sys/un.h>
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#ifdef CONFIG_SYSMACROS
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#include <sys/sysmacros.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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void os_set_line_buffering(void);
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void os_setup_early_signal_handling(void);
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void os_set_proc_name(const char *s);
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void os_setup_signal_handling(void);
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void os_setup_limits(void);
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void os_setup_post(void);
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int os_mlock(bool on_fault);
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static inline int os_set_daemonize(bool d)
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{
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return -1;
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};
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bool is_daemonized(void);
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static inline void os_daemonize(void) {}
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/**
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* qemu_alloc_stack:
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* @sz: pointer to a size_t holding the requested usable stack size
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*
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* Allocate memory that can be used as a stack, for instance for
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* coroutines. If the memory cannot be allocated, this function
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* will abort (like g_malloc()). This function also inserts an
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* additional guard page to catch a potential stack overflow.
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* Note that the memory required for the guard page and alignment
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* and minimal stack size restrictions will increase the value of sz.
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*
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* The allocated stack must be freed with qemu_free_stack().
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*
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* Returns: pointer to (the lowest address of) the stack memory.
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*/
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void *qemu_alloc_stack(size_t *sz);
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/**
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* qemu_free_stack:
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* @stack: stack to free
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* @sz: size of stack in bytes
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*
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* Free a stack allocated via qemu_alloc_stack(). Note that sz must
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* be exactly the adjusted stack size returned by qemu_alloc_stack.
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*/
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void qemu_free_stack(void *stack, size_t sz);
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/* POSIX and Mingw32 differ in the name of the stdio lock functions. */
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static inline void qemu_flockfile(FILE *f)
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{
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flockfile(f);
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}
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static inline void qemu_funlockfile(FILE *f)
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{
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funlockfile(f);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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119
os-wasm.c
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119
os-wasm.c
Normal file
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@ -0,0 +1,119 @@
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/* SPDX-License-Identifier: MIT */
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/*
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* os-wasm.c
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* Forked from os-posix.c, removing functions not working on Emscripten
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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* Copyright (c) 2010 Red Hat, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include <sys/resource.h>
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#include <sys/wait.h>
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#include <pwd.h>
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#include <grp.h>
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#include <libgen.h>
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#include "qemu/error-report.h"
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#include "qemu/log.h"
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#include "system/runstate.h"
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#include "qemu/cutils.h"
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void os_setup_post(void){}
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void os_set_line_buffering(void)
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{
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setvbuf(stdout, NULL, _IOLBF, 0);
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}
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void os_setup_early_signal_handling(void)
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{
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struct sigaction act;
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sigfillset(&act.sa_mask);
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act.sa_flags = 0;
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act.sa_handler = SIG_IGN;
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sigaction(SIGPIPE, &act, NULL);
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}
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void os_set_proc_name(const char *s)
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{
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error_report("Change of process name not supported by your OS");
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exit(1);
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}
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static void termsig_handler(int signal, siginfo_t *info, void *c)
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{
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qemu_system_killed(info->si_signo, info->si_pid);
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}
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void os_setup_signal_handling(void)
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{
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struct sigaction act;
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memset(&act, 0, sizeof(act));
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act.sa_sigaction = termsig_handler;
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act.sa_flags = SA_SIGINFO;
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sigaction(SIGINT, &act, NULL);
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sigaction(SIGHUP, &act, NULL);
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sigaction(SIGTERM, &act, NULL);
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}
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void os_setup_limits(void)
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{
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struct rlimit nofile;
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if (getrlimit(RLIMIT_NOFILE, &nofile) < 0) {
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warn_report("unable to query NOFILE limit: %s", strerror(errno));
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return;
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}
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if (nofile.rlim_cur == nofile.rlim_max) {
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return;
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}
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nofile.rlim_cur = nofile.rlim_max;
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if (setrlimit(RLIMIT_NOFILE, &nofile) < 0) {
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warn_report("unable to set NOFILE limit: %s", strerror(errno));
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return;
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}
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}
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int os_mlock(bool on_fault)
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{
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#ifdef HAVE_MLOCKALL
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int ret = 0;
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int flags = MCL_CURRENT | MCL_FUTURE;
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if (on_fault) {
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#ifdef HAVE_MLOCK_ONFAULT
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flags |= MCL_ONFAULT;
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#else
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error_report("mlockall: on_fault not supported");
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return -EINVAL;
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#endif
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}
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ret = mlockall(flags);
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if (ret < 0) {
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error_report("mlockall: %s", strerror(errno));
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}
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return ret;
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#else
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(void)on_fault;
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return -ENOSYS;
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#endif
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}
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