mirror of
https://github.com/jart/cosmopolitan.git
synced 2026-11-07 10:36:04 -10:00
Justine Tunney
5ddb5c2ada
- Open flags (e.g. O_CREAT) are now constants - Error numbers (e.g. EINVAL) are now constants - Signal numbers (e.g. SIGINT) are now constants - fcntl() file locks now work properly on Windows - Significantly improve Windows path handling code - Implement true vfork() on Windows and make fork() faster - Implement scanf %[charset] support and improve conformance - Introduce $COSMOSDRIVE so you can use Windows 11 dev drives - Fix stdio seek/tell bug and make stdio locks faster and safer - Change TLS ABI to use tlscc wrapper that inserts function calls - Make malloc() faster on all platforms using new cosmo_shard() api - Make malloc() fast like tcmalloc on Linux using restartable sequences - Improve fsync() and fdatasync() polyfills so they abstract robustness - Fix CLOCK_BOOTTIME and CLOCK_MONOTONIC on XNU so it reflects uptime - Fix bugs in Windows overlapped code that could possibly cause crash - Fix bugs in Windows signal code that could possibly cause crash - Make symlinks with multiple components work right on Windows - Add FreeBSD ELF note to remove SIGBUS issue and other quirks - Support symlinks on Windows under non-administrator accounts - Make kisdangerous() scalable by adding radix trie to mmap() - Make large realloc() operations zero-cost on all platforms - Fix bugs in readdir() on Windows where d_reclen wasn't set - Make all system call wrappers memory safe (raises EFAULT) - Fix bugs in poll() and select() on Windows with 64+ fds - Fix bug in madvise() on Windows that could cause crash - Support WUNTRACED, SIGSTOP, and SIGCONT on Windows - Increase x86 image base from 0x400000 to 0x4200000 - Introduce -msysv and -mtinylinux flags to cosmocc - Fix issues with siglongjmp() on XNU and NetBSD - Make pthread_barrier_wait() work correctly - Make clock_gettime() faster on FreeBSD ARM - Support file mode bits better on Windows - Improve performance of string libraries - Raise EILSEQ when creating evil paths - Fix std::terminate to not use malloc - Modernize more c11 and c23 features - Make pthread_once() exception safe - Support RLIMIT_CPU on Windows - Introduce HACL* cryptography - Introduce cosmopolitan make - Introduce fasterzip program - Introduce open_memstream() - Introduce dedupe program - Introduce arc4random() - Introduce f2fs support
74 lines
2.5 KiB
C
74 lines
2.5 KiB
C
#if 0
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/*─────────────────────────────────────────────────────────────────╗
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│ To the extent possible under law, Justine Tunney has waived │
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│ all copyright and related or neighboring rights to this file, │
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│ as it is written in the following disclaimers: │
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│ • http://unlicense.org/ │
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│ • http://creativecommons.org/publicdomain/zero/1.0/ │
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╚─────────────────────────────────────────────────────────────────*/
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ucontext.h>
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#include <unistd.h>
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/**
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* @fileoverview swapcontext() and makecontext() example
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* @note adapted from the Linux man-pages project
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*/
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static ucontext_t uctx_main;
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static ucontext_t uctx_func1;
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static ucontext_t uctx_func2;
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#define say(s) (void)!write(1, s, strlen(s))
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#define handle_error(msg) \
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do { \
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perror(msg); \
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exit(EXIT_FAILURE); \
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} while (0)
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static void func1(void) {
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say("func1: started\n");
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say("func1: swapcontext(&uctx_func1, &uctx_func2)\n");
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if (swapcontext(&uctx_func1, &uctx_func2) == -1)
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handle_error("swapcontext");
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say("func1: returning\n");
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}
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static void func2(void) {
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say("func2: started\n");
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say("func2: swapcontext(&uctx_func2, &uctx_func1)\n");
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if (swapcontext(&uctx_func2, &uctx_func1) == -1)
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handle_error("swapcontext");
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say("func2: returning\n");
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}
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int main(int argc, char *argv[]) {
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char func1_stack[8192];
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char func2_stack[8192];
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if (getcontext(&uctx_func1) == -1)
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handle_error("getcontext");
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uctx_func1.uc_stack.ss_sp = func1_stack;
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uctx_func1.uc_stack.ss_size = sizeof(func1_stack);
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uctx_func1.uc_link = &uctx_main;
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makecontext(&uctx_func1, func1, 0);
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if (getcontext(&uctx_func2) == -1)
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handle_error("getcontext");
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uctx_func2.uc_stack.ss_sp = func2_stack;
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uctx_func2.uc_stack.ss_size = sizeof(func2_stack);
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/* Successor context is f1(), unless argc > 1 */
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uctx_func2.uc_link = (argc > 1) ? NULL : &uctx_func1;
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makecontext(&uctx_func2, func2, 0);
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say("main: swapcontext(&uctx_main, &uctx_func2)\n");
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if (swapcontext(&uctx_main, &uctx_func2) == -1)
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handle_error("swapcontext");
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say("main: exiting\n");
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exit(EXIT_SUCCESS);
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}
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