{"id":2075175,"url":"http://patchwork.ozlabs.org/api/patches/2075175/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/patch/5bad5a7ee50b6e3e18cf97ac07837988b25ad07f.1745295397.git.ktokunaga.mail@gmail.com/","project":{"id":14,"url":"http://patchwork.ozlabs.org/api/projects/14/?format=json","name":"QEMU Development","link_name":"qemu-devel","list_id":"qemu-devel.nongnu.org","list_email":"qemu-devel@nongnu.org","web_url":"","scm_url":"","webscm_url":"","list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<5bad5a7ee50b6e3e18cf97ac07837988b25ad07f.1745295397.git.ktokunaga.mail@gmail.com>","list_archive_url":null,"date":"2025-04-22T05:27:18","name":"[v2,14/20] include/qemu/osdep.h: Add Emscripten-specific OS dependencies","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"e60c610ee98a3b96e9342e03f16314cafb10924d","submitter":{"id":90637,"url":"http://patchwork.ozlabs.org/api/people/90637/?format=json","name":"Kohei Tokunaga","email":"ktokunaga.mail@gmail.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/qemu-devel/patch/5bad5a7ee50b6e3e18cf97ac07837988b25ad07f.1745295397.git.ktokunaga.mail@gmail.com/mbox/","series":[{"id":453631,"url":"http://patchwork.ozlabs.org/api/series/453631/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/list/?series=453631","date":"2025-04-22T05:27:04","name":"Enable QEMU TCI to run 32bit guests on browsers","version":2,"mbox":"http://patchwork.ozlabs.org/series/453631/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2075175/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2075175/checks/","tags":{},"related":[],"headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20230601 header.b=S0q12Uw3;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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helo=mail-pg1-x532.google.com","X-Spam_score_int":"-20","X-Spam_score":"-2.1","X-Spam_bar":"--","X-Spam_report":"(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no","X-Spam_action":"no action","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"},"content":"On emscripten, some implementations in os-posix.c can't be used such as\ndaemonizing and changing user. This commit introduces os-wasm.c and\nos-wasm.h which are forked from os-posix.c and os-posix.h and patched for\ntargetting Emscripten.\n\nSigned-off-by: Kohei Tokunaga \n---\n MAINTAINERS | 6 ++\n include/qemu/osdep.h | 8 ++-\n include/system/os-wasm.h | 104 ++++++++++++++++++++++++++++++++++\n os-wasm.c | 119 +++++++++++++++++++++++++++++++++++++++\n 4 files changed, 235 insertions(+), 2 deletions(-)\n create mode 100644 include/system/os-wasm.h\n create mode 100644 os-wasm.c\n\nV2:\n- Moved the change that was incorrectly applied to os-posix.h into os-wasm.h\n- Split the MAINTAINERS file change that adds os-wasm.c and os-wasm.h from\n the previous 19th patch into this commit.","diff":"diff --git a/MAINTAINERS b/MAINTAINERS\nindex d54b5578f8..c7a20ac8d7 100644\n--- a/MAINTAINERS\n+++ b/MAINTAINERS\n@@ -619,6 +619,12 @@ F: .gitlab-ci.d/cirrus/macos-*\n F: */*.m\n F: scripts/entitlement.sh\n \n+WebAssembly\n+M: Kohei Tokunaga \n+S: Maintained\n+F: include/system/os-wasm.h\n+F: os-wasm.c\n+\n Alpha Machines\n --------------\n M: Richard Henderson \ndiff --git a/include/qemu/osdep.h b/include/qemu/osdep.h\nindex 4397a90680..96fe51bc39 100644\n--- a/include/qemu/osdep.h\n+++ b/include/qemu/osdep.h\n@@ -8,7 +8,7 @@\n * To avoid getting into possible circular include dependencies, this\n * file should not include any other QEMU headers, with the exceptions\n * of config-host.h, config-target.h, qemu/compiler.h,\n- * system/os-posix.h, system/os-win32.h, glib-compat.h and\n+ * system/os-posix.h, system/os-win32.h, system/os-wasm.h, glib-compat.h and\n * qemu/typedefs.h, all of which are doing a similar job to this file\n * and are under similar constraints.\n *\n@@ -164,10 +164,14 @@ QEMU_EXTERN_C int daemon(int, int);\n #include \"system/os-win32.h\"\n #endif\n \n-#ifdef CONFIG_POSIX\n+#if defined(CONFIG_POSIX) && !defined(EMSCRIPTEN)\n #include \"system/os-posix.h\"\n #endif\n \n+#if defined(EMSCRIPTEN)\n+#include \"system/os-wasm.h\"\n+#endif\n+\n #ifdef __cplusplus\n extern \"C\" {\n #endif\ndiff --git a/include/system/os-wasm.h b/include/system/os-wasm.h\nnew file mode 100644\nindex 0000000000..3abb3aaa03\n--- /dev/null\n+++ b/include/system/os-wasm.h\n@@ -0,0 +1,104 @@\n+/* SPDX-License-Identifier: MIT */\n+/*\n+ * posix specific declarations forked from os-posix.h, removing functions not\n+ * working on Emscripten\n+ *\n+ * Copyright (c) 2003-2008 Fabrice Bellard\n+ * Copyright (c) 2010 Jes Sorensen \n+ *\n+ * Permission is hereby granted, free of charge, to any person obtaining a copy\n+ * of this software and associated documentation files (the \"Software\"), to deal\n+ * in the Software without restriction, including without limitation the rights\n+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\n+ * copies of the Software, and to permit persons to whom the Software is\n+ * furnished to do so, subject to the following conditions:\n+ *\n+ * The above copyright notice and this permission notice shall be included in\n+ * all copies or substantial portions of the Software.\n+ *\n+ * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL\n+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\n+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN\n+ * THE SOFTWARE.\n+ */\n+\n+#ifndef QEMU_OS_WASM_H\n+#define QEMU_OS_WASM_H\n+\n+#include \n+#include \n+#include \n+#include \n+#include \n+#include \n+#include \n+\n+#ifdef CONFIG_SYSMACROS\n+#include \n+#endif\n+\n+#ifdef __cplusplus\n+extern \"C\" {\n+#endif\n+\n+void os_set_line_buffering(void);\n+void os_setup_early_signal_handling(void);\n+void os_set_proc_name(const char *s);\n+void os_setup_signal_handling(void);\n+void os_setup_limits(void);\n+void os_setup_post(void);\n+int os_mlock(bool on_fault);\n+static inline int os_set_daemonize(bool d)\n+{\n+ return -1;\n+};\n+bool is_daemonized(void);\n+static inline void os_daemonize(void) {}\n+\n+/**\n+ * qemu_alloc_stack:\n+ * @sz: pointer to a size_t holding the requested usable stack size\n+ *\n+ * Allocate memory that can be used as a stack, for instance for\n+ * coroutines. If the memory cannot be allocated, this function\n+ * will abort (like g_malloc()). This function also inserts an\n+ * additional guard page to catch a potential stack overflow.\n+ * Note that the memory required for the guard page and alignment\n+ * and minimal stack size restrictions will increase the value of sz.\n+ *\n+ * The allocated stack must be freed with qemu_free_stack().\n+ *\n+ * Returns: pointer to (the lowest address of) the stack memory.\n+ */\n+void *qemu_alloc_stack(size_t *sz);\n+\n+/**\n+ * qemu_free_stack:\n+ * @stack: stack to free\n+ * @sz: size of stack in bytes\n+ *\n+ * Free a stack allocated via qemu_alloc_stack(). Note that sz must\n+ * be exactly the adjusted stack size returned by qemu_alloc_stack.\n+ */\n+void qemu_free_stack(void *stack, size_t sz);\n+\n+/* POSIX and Mingw32 differ in the name of the stdio lock functions. */\n+\n+static inline void qemu_flockfile(FILE *f)\n+{\n+ flockfile(f);\n+}\n+\n+static inline void qemu_funlockfile(FILE *f)\n+{\n+ funlockfile(f);\n+}\n+\n+#ifdef __cplusplus\n+}\n+#endif\n+\n+#endif\ndiff --git a/os-wasm.c b/os-wasm.c\nnew file mode 100644\nindex 0000000000..d240c180c5\n--- /dev/null\n+++ b/os-wasm.c\n@@ -0,0 +1,119 @@\n+/* SPDX-License-Identifier: MIT */\n+/*\n+ * os-wasm.c\n+ * Forked from os-posix.c, removing functions not working on Emscripten\n+ *\n+ * Copyright (c) 2003-2008 Fabrice Bellard\n+ * Copyright (c) 2010 Red Hat, Inc.\n+ *\n+ * Permission is hereby granted, free of charge, to any person obtaining a copy\n+ * of this software and associated documentation files (the \"Software\"), to deal\n+ * in the Software without restriction, including without limitation the rights\n+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\n+ * copies of the Software, and to permit persons to whom the Software is\n+ * furnished to do so, subject to the following conditions:\n+ *\n+ * The above copyright notice and this permission notice shall be included in\n+ * all copies or substantial portions of the Software.\n+ *\n+ * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL\n+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\n+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN\n+ * THE SOFTWARE.\n+ */\n+\n+#include \"qemu/osdep.h\"\n+#include \n+#include \n+#include \n+#include \n+#include \n+\n+#include \"qemu/error-report.h\"\n+#include \"qemu/log.h\"\n+#include \"system/runstate.h\"\n+#include \"qemu/cutils.h\"\n+\n+void os_setup_post(void){}\n+void os_set_line_buffering(void)\n+{\n+ setvbuf(stdout, NULL, _IOLBF, 0);\n+}\n+void os_setup_early_signal_handling(void)\n+{\n+ struct sigaction act;\n+ sigfillset(&act.sa_mask);\n+ act.sa_flags = 0;\n+ act.sa_handler = SIG_IGN;\n+ sigaction(SIGPIPE, &act, NULL);\n+}\n+void os_set_proc_name(const char *s)\n+{\n+ error_report(\"Change of process name not supported by your OS\");\n+ exit(1);\n+}\n+static void termsig_handler(int signal, siginfo_t *info, void *c)\n+{\n+ qemu_system_killed(info->si_signo, info->si_pid);\n+}\n+\n+void os_setup_signal_handling(void)\n+{\n+ struct sigaction act;\n+\n+ memset(&act, 0, sizeof(act));\n+ act.sa_sigaction = termsig_handler;\n+ act.sa_flags = SA_SIGINFO;\n+ sigaction(SIGINT, &act, NULL);\n+ sigaction(SIGHUP, &act, NULL);\n+ sigaction(SIGTERM, &act, NULL);\n+}\n+void os_setup_limits(void)\n+{\n+ struct rlimit nofile;\n+\n+ if (getrlimit(RLIMIT_NOFILE, &nofile) < 0) {\n+ warn_report(\"unable to query NOFILE limit: %s\", strerror(errno));\n+ return;\n+ }\n+\n+ if (nofile.rlim_cur == nofile.rlim_max) {\n+ return;\n+ }\n+\n+ nofile.rlim_cur = nofile.rlim_max;\n+\n+ if (setrlimit(RLIMIT_NOFILE, &nofile) < 0) {\n+ warn_report(\"unable to set NOFILE limit: %s\", strerror(errno));\n+ return;\n+ }\n+}\n+int os_mlock(bool on_fault)\n+{\n+#ifdef HAVE_MLOCKALL\n+ int ret = 0;\n+ int flags = MCL_CURRENT | MCL_FUTURE;\n+\n+ if (on_fault) {\n+#ifdef HAVE_MLOCK_ONFAULT\n+ flags |= MCL_ONFAULT;\n+#else\n+ error_report(\"mlockall: on_fault not supported\");\n+ return -EINVAL;\n+#endif\n+ }\n+\n+ ret = mlockall(flags);\n+ if (ret < 0) {\n+ error_report(\"mlockall: %s\", strerror(errno));\n+ }\n+\n+ return ret;\n+#else\n+ (void)on_fault;\n+ return -ENOSYS;\n+#endif\n+}\n","prefixes":["v2","14/20"]}