mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 03:27:39 +00:00
dc1afc968b
On Windows, sometimes fork() could crash with message likes:
fork() ViewOrDie(170000) failed with win32 error 487
This is due to a bug in our file descriptor inheritance. We have cursors
which are shared between processes. They let us track the file positions
of read() and write() operations. At startup they were being mmap()ed to
memory addresses that were assigned by WIN32. That's bad because Windows
likes to give us memory addresses beneath the program image in the first
4mb range that are likely to conflict with other assignments. That ended
up causing problems because fork() needs to be able to assume that a map
will be possible to resurrect at the same address. But for one reason or
another, Windows libraries we don't control could sneak allocations into
the memory space that overlap with these mappings. This change solves it
by choosing a random memory address instead when mapping cursor objects.
152 lines
5.8 KiB
C
152 lines
5.8 KiB
C
#ifndef COSMOPOLITAN_LIBC_RUNTIME_RUNTIME_H_
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#define COSMOPOLITAN_LIBC_RUNTIME_RUNTIME_H_
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COSMOPOLITAN_C_START_
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/*───────────────────────────────────────────────────────────────────────────│─╗
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│ cosmopolitan § runtime ─╬─│┼
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╚────────────────────────────────────────────────────────────────────────────│*/
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/* clang-format off */
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#ifdef __x86_64__
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typedef long jmp_buf[8];
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typedef long sigjmp_buf[11];
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#elif defined(__aarch64__)
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typedef long jmp_buf[22];
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typedef long sigjmp_buf[25];
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#elif defined(__powerpc64__)
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typedef unsigned __int128 jmp_buf[32];
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#elif defined(__s390x__)
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typedef unsigned long jmp_buf[18];
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#elif defined(__riscv)
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typedef unsigned long jmp_buf[26];
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#endif
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void mcount(void) libcesque;
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int daemon(int, int) libcesque;
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unsigned long getauxval(unsigned long) libcesque;
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int setjmp(jmp_buf) libcesque returnstwice paramsnonnull();
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void longjmp(jmp_buf, int) libcesque wontreturn paramsnonnull();
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int _setjmp(jmp_buf) libcesque returnstwice paramsnonnull();
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int sigsetjmp(sigjmp_buf, int) libcesque returnstwice paramsnonnull();
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void siglongjmp(sigjmp_buf, int) libcesque wontreturn paramsnonnull();
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void _longjmp(jmp_buf, int) libcesque wontreturn paramsnonnull();
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void exit(int) wontreturn;
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void _exit(int) libcesque wontreturn;
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void _Exit(int) libcesque wontreturn;
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void quick_exit(int) wontreturn;
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void abort(void) wontreturn;
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int atexit(void (*)(void)) paramsnonnull() libcesque;
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char *getenv(const char *) paramsnonnull() __wur nosideeffect libcesque;
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int putenv(char *) libcesque __read_write(1);
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int setenv(const char *, const char *, int) libcesque;
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int unsetenv(const char *) libcesque;
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int clearenv(void) libcesque;
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void fpreset(void) libcesque;
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void *mmap(void *, uint64_t, int32_t, int32_t, int32_t, int64_t) libcesque;
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void *mremap(void *, size_t, size_t, int, ...) libcesque;
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int munmap(void *, uint64_t) libcesque;
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int mprotect(void *, uint64_t, int) libcesque;
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int msync(void *, size_t, int) libcesque;
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int mlock(const void *, size_t) libcesque;
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int munlock(const void *, size_t) libcesque;
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long gethostid(void) libcesque;
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int sethostid(long) libcesque;
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char *getlogin(void) libcesque;
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int getlogin_r(char *, size_t) libcesque __write_only(1, 2);
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int login_tty(int) libcesque __fd_arg(1);
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int getpagesize(void) pureconst libcesque;
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int getgransize(void) pureconst libcesque;
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int syncfs(int) dontthrow libcesque;
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int vhangup(void) libcesque;
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int getdtablesize(void) libcesque;
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int sethostname(const char *, size_t) libcesque;
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int acct(const char *) libcesque;
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#if defined(_GNU_SOURCE) || defined(_COSMO_SOURCE)
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extern char **environ;
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char *secure_getenv(const char *) paramsnonnull() __wur nosideeffect libcesque;
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#endif
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#ifdef _COSMO_SOURCE
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extern int __argc;
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extern char **__argv;
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extern char **__envp;
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extern int __pagesize;
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extern int __gransize;
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extern unsigned long *__auxv;
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extern intptr_t __oldstack;
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extern char *__program_executable_name;
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extern uint64_t __nosync;
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extern int __strace;
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extern int __ftrace;
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extern uint64_t __syscount;
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extern uint64_t kStartTsc;
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extern const char kNtSystemDirectory[];
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extern const char kNtWindowsDirectory[];
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extern size_t __virtualmax;
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extern size_t __virtualsize;
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extern size_t __stackmax;
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extern bool32 __isworker;
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/* utilities */
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void _intsort(int *, size_t) libcesque __read_write(1, 2);
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void _longsort(long *, size_t) libcesque __read_write(1, 2);
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/* diagnostics */
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void ShowCrashReports(void) libcesque;
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int ftrace_install(void) libcesque;
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int ftrace_enabled(int) libcesque;
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int strace_enabled(int) libcesque;
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void __print_maps(size_t) libcesque;
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void __print_maps_win32(void) libcesque;
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void __printargs(const char *) libcesque;
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/* builtin sh-like system/popen dsl */
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int _cocmd(int, char **, char **) libcesque;
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/* executable program */
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char *GetProgramExecutableName(void) libcesque;
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char *GetInterpreterExecutableName(char *, size_t) libcesque;
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int __open_executable(void) libcesque;
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/* execution control */
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int verynice(void) libcesque;
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void __warn_if_powersave(void) libcesque;
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void _Exit1(int) libcesque wontreturn libcesque;
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void __paginate(int, const char *) libcesque __fd_arg(1);
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void __paginate_file(int, const char *) libcesque __fd_arg(1);
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/* memory management */
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void _weakfree(void *) libcesque;
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void *_mapanon(size_t) attributeallocsize((1)) mallocesque libcesque;
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void *_mapshared(size_t) attributeallocsize((1)) mallocesque libcesque;
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void CheckForFileLeaks(void) libcesque;
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void __oom_hook(size_t) libcesque;
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/* code morphing */
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void __morph_begin(void) libcesque;
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void __morph_end(void) libcesque;
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void __jit_begin(void) libcesque;
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void __jit_end(void) libcesque;
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void __clear_cache(void *, void *);
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/* portability */
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bool32 IsGenuineBlink(void) libcesque;
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bool32 IsCygwin(void) libcesque;
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const char *GetCpuidOs(void) libcesque;
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const char *GetCpuidEmulator(void) libcesque;
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void GetCpuidBrand(char[13], uint32_t) libcesque;
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long __get_rlimit(int) libcesque;
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const char *__describe_os(void) libcesque;
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long __get_sysctl(int, int) libcesque;
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int __get_arg_max(void) pureconst libcesque;
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int __get_cpu_count(void) pureconst libcesque;
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long __get_avphys_pages(void) pureconst libcesque;
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long __get_phys_pages(void) pureconst libcesque;
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long __get_minsigstksz(void) pureconst libcesque;
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long __get_safe_size(long, long) libcesque;
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char *__get_tmpdir(void) libcesque;
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forceinline int __trace_disabled(int x) {
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return 0;
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}
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#ifndef FTRACE
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#define ftrace_enabled(...) __trace_disabled(__VA_ARGS__)
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#endif
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#ifndef SYSDEBUG
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#define strace_enabled(...) __trace_disabled(__VA_ARGS__)
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#endif
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#endif /* _COSMO_SOURCE */
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COSMOPOLITAN_C_END_
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#endif /* COSMOPOLITAN_LIBC_RUNTIME_RUNTIME_H_ */
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