mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
e7611a8476
- Get threads working on NetBSD - Get threads working on OpenBSD - Fix Emacs config for Emacs v28 - Improve --strace logging of sigset_t - Improve --strace logging of struct stat - Improve memory safety of DescribeThing functions - Refactor auto stack allocation into LIBC_RUNTIME - Introduce shell.com example which works on Windows - Refactor __strace_thing into DescribeThing functions - Document the CHECK macros and improve them in NDEBUG mode - Rewrite MAP_STACK so it uses FreeBSD behavior across platforms - Deprecate and discourage the use of MAP_GROWSDOWN (it's weird)
85 lines
3.9 KiB
C
85 lines
3.9 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/weaken.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/sig.internal.h"
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#include "libc/calls/sigbits.h"
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#include "libc/calls/strace.internal.h"
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#include "libc/calls/struct/sigset.h"
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#include "libc/dce.h"
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#include "libc/fmt/itoa.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/log/log.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/sysv/errfuns.h"
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static const char *DescribeHow(char buf[12], int how) {
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if (how == SIG_BLOCK) return "SIG_BLOCK";
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if (how == SIG_UNBLOCK) return "SIG_UNBLOCK";
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if (how == SIG_SETMASK) return "SIG_SETMASK";
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FormatInt32(buf, how);
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return buf;
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}
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/**
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* Changes signal blocking state of calling thread, e.g.:
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*
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* sigset_t neu,old;
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* sigfillset(&neu);
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* sigprocmask(SIG_BLOCK, &neu, &old);
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* sigprocmask(SIG_SETMASK, &old, NULL);
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*
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* @param how can be SIG_BLOCK (U), SIG_UNBLOCK (/), SIG_SETMASK (=)
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* @param set is the new mask content (optional)
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* @param oldset will receive the old mask (optional) and can't overlap
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* @return 0 on success, or -1 w/ errno
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* @asyncsignalsafe
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* @restartable
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* @vforksafe
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*/
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int sigprocmask(int how, const sigset_t *opt_set, sigset_t *opt_out_oldset) {
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sigset_t old;
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char howbuf[12];
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char buf[2][41];
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int res, rc, arg1;
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const sigset_t *arg2;
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sigemptyset(&old);
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if (IsAsan() &&
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((opt_set && !__asan_is_valid(opt_set, sizeof(*opt_set))) ||
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(opt_out_oldset &&
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!__asan_is_valid(opt_out_oldset, sizeof(*opt_out_oldset))))) {
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rc = efault();
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} else if (IsMetal() || IsWindows()) {
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rc = __sig_mask(how, opt_set, &old);
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_check_interrupts(false, 0);
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} else {
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rc = sys_sigprocmask(how, opt_set, opt_out_oldset ? &old : 0);
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}
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if (rc != -1 && opt_out_oldset) {
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*opt_out_oldset = old;
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}
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STRACE("sigprocmask(%s, %s, [%s]) → %d% m", DescribeHow(howbuf, how),
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DescribeSigset(buf[0], sizeof(buf[0]), 0, opt_set),
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DescribeSigset(buf[1], sizeof(buf[1]), rc, opt_out_oldset), rc);
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return rc;
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}
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