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Introduce sigtimedwait() and sigwaitinfo()

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This change also invents sigcountset() and strsignal_r() and improves
the quality of siginfo_t handling.
This commit is contained in:
Justine Tunney 2022-10-10 07:36:07 -07:00
parent 7ae556463a
commit 467a332e38
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GPG key ID: BE714B4575D6E328
41 changed files with 887 additions and 345 deletions
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60
libc/intrin/strsignal_r.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/fmt/itoa.h"
#include "libc/fmt/magnumstrs.internal.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/sig.h"
/**
* Returns string describing signal code.
*
* This returns `"0"` for 0 which is the empty value. Symbolic names
* should be available for signals 1 through 32. If the system supports
* real-time signals, they're returned as `SIGRTMIN+%d`. For all other
* 32-bit signed integer, a plain integer representation is returned.
*
* @param sig is signal number which should be in range 1 through 128
* @param buf may be used to store output having at least 15 bytes
* @return pointer to .rodata string, or to `buf` after mutating
* @see sigaction()
* @threadsafe
*/
char *strsignal_r(int sig, char buf[hasatleast 15]) {
int i;
char *p;
const char *s;
if (!sig) return "0";
if ((s = GetMagnumStr(kSignalNames, sig))) return s;
if (SIGRTMIN <= sig && sig <= SIGRTMAX) {
sig -= SIGRTMIN;
buf[0] = 'S';
buf[1] = 'I';
buf[2] = 'G';
buf[3] = 'R';
buf[4] = 'T';
buf[5] = 'M';
buf[6] = 'I';
buf[7] = 'N';
buf[8] = '+';
FormatInt32(buf + 9, sig);
} else {
FormatInt32(buf, sig);
}
return buf;
}