mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-01 03:53:33 +00:00
393ca4be40
redbean will now cleanup child processes properly. New accounting information is available too, such as page faults and memory usage. The way it works is Cosmopolitan Libc samples the process collection on entry into read() and poll() to see if SIGCHLD needs to be raised. This change also fixes an issue with chibicc /tmp cleanup. There was also a regression in MODE=dbg because STL needed ASAN runtime support.
85 lines
4.1 KiB
C
85 lines
4.1 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/assert.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/strace.internal.h"
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#include "libc/errno.h"
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#include "libc/rand/lcg.internal.h"
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#include "libc/rand/rand.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/temp.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/errfuns.h"
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#define RESEED 1024
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#define ATTEMPTS 10
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#define WILDCARD "XXXXXX"
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int mkostempsmi(char *tpl, int slen, unsigned flags, uint64_t *rando, int mode,
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int openit(const char *file, int flags, ...)) {
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size_t len = strlen(tpl);
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size_t wildlen = strlen(WILDCARD);
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if (len < wildlen || slen > len - wildlen) return einval();
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char *ss = tpl + len - wildlen - slen;
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assert(memcmp(ss, WILDCARD, wildlen) == 0);
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flags = (flags & ~(flags & O_ACCMODE)) | O_RDWR | O_CREAT | O_EXCL;
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unsigned attempts = ATTEMPTS;
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do {
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char *p = ss;
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uint32_t num = KnuthLinearCongruentialGenerator(rando) >> 32;
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for (unsigned i = 0; i < wildlen; ++i) {
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p[i] = "0123456789abcdefghijklmnopqrstuvwxyz"[num & 31];
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num >>= 5;
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}
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int fd;
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if ((fd = openit(tpl, flags, 0600)) != -1) return fd;
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} while (--attempts && errno == EEXIST);
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memcpy(ss, WILDCARD, wildlen);
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return -1;
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}
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static uint64_t g_mkostemps_rand;
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static uint64_t g_mkostemps_reseed;
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/**
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* Opens unique temporary file.
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*
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* The substring XXXXXX is replaced with a pseudorandom number that's
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* seeded automatically and grants 30 bits of randomness to each value.
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* Retries are made in the unlikely event of collisions.
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*
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* @param template is a pathname relative to current directory by default,
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* that needs to have "XXXXXX" at the end of the string
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* @param suffixlen may be nonzero to permit characters after the XXXXXX
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* @param flags can have O_APPEND, O_CLOEXEC, etc.
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* @param mode is conventionally 0600, for owner-only non-exec access
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* @return exclusive open file descriptor for generated pathname,
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* or -1 w/ errno
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* @see kTmpPath
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*/
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dontdiscard int mkostempsm(char *template, int suffixlen, unsigned flags,
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int mode) {
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int fd;
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if (g_mkostemps_reseed++ % RESEED == 0) g_mkostemps_rand = rand64();
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fd = mkostempsmi(template, suffixlen, flags, &g_mkostemps_rand, mode, open);
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STRACE("mkostempsm([%#s], %'d, %#x, %#o) → %d% m", template, suffixlen, flags,
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mode, fd);
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return fd;
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}
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