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https://github.com/jart/cosmopolitan.git
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80b211e314
This change introduces a `-W /dev/pts/1` flag to redbean. What it does is use the mincore() system call to create a dual-screen terminal display that lets you troubleshoot the virtual address space. This is useful since page faults are an important thing to consider when using a forking web server. Now we have a colorful visualization of which pages are going to fault and which ones are resident in memory. The memory monitor, if enabled, spawns as a thread that just outputs ANSI codes to the second terminal in a loop. In order to make this happen using the new clone() polyfill, stdio is now thread safe. This change also introduces some new demo pages to redbean. It also polishes the demos we already have, to look a bit nicer and more presentable for the upcoming release, with better explanations too.
132 lines
5.1 KiB
C
132 lines
5.1 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/bits/bits.h"
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#include "libc/bits/safemacros.internal.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/calls/struct/stat.h"
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#include "libc/calls/struct/timeval.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/fmt/conv.h"
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#include "libc/fmt/fmt.h"
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#include "libc/intrin/spinlock.h"
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#include "libc/log/internal.h"
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#include "libc/log/log.h"
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#include "libc/math.h"
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#include "libc/nexgen32e/nexgen32e.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/fileno.h"
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#include "libc/time/struct/tm.h"
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#include "libc/time/time.h"
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#define kNontrivialSize (8 * 1000 * 1000)
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static struct timespec vflogf_ts;
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_Alignas(64) static char vflogf_lock;
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/**
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* Takes corrective action if logging is on the fritz.
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*/
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void vflogf_onfail(FILE *f) {
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errno_t err;
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int64_t size;
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if (IsTiny()) return;
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err = ferror(f);
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if (fileno(f) != -1 && (err == ENOSPC || err == EDQUOT || err == EFBIG) &&
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((size = getfiledescriptorsize(fileno(f))) == -1 ||
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size > kNontrivialSize)) {
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ftruncate(fileno(f), 0);
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fseek(f, SEEK_SET, 0);
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f->beg = f->end = 0;
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clearerr(f);
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(fprintf)(f, "performed emergency log truncation: %s\n", strerror(err));
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}
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}
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/**
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* Writes formatted message w/ timestamp to log.
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*
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* Timestamps are hyphenated out when multiple events happen within the
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* same second in the same process. When timestamps are crossed out, it
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* will display microseconsd as a delta elapsed time. This is useful if
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* you do something like:
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*
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* INFOF("connecting to foo");
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* connect(...)
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* INFOF("connected to foo");
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*
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* In that case, the second log entry will always display the amount of
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* time that it took to connect. This is great in forking applications.
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*/
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void(vflogf)(unsigned level, const char *file, int line, FILE *f,
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const char *fmt, va_list va) {
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int bufmode;
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struct tm tm;
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long double t2;
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const char *prog;
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bool issamesecond;
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char buf32[32];
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int64_t secs, nsec, dots;
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if (!f) f = __log_file;
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if (!f) return;
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_spinlock(&vflogf_lock);
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__atomic_fetch_sub(&__strace, 1, __ATOMIC_RELAXED);
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t2 = nowl();
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secs = t2;
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nsec = (t2 - secs) * 1e9L;
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issamesecond = secs == vflogf_ts.tv_sec;
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dots = issamesecond ? nsec - vflogf_ts.tv_nsec : nsec;
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vflogf_ts.tv_sec = secs;
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vflogf_ts.tv_nsec = nsec;
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localtime_r(&secs, &tm);
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strcpy(iso8601(buf32, &tm), issamesecond ? "+" : ".");
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prog = basename(firstnonnull(program_invocation_name, "unknown"));
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bufmode = f->bufmode;
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if (bufmode == _IOLBF) f->bufmode = _IOFBF;
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if ((fprintf)(f, "%r%c%s%06ld:%s:%d:%.*s:%d] ", "FEWIVDNT"[level & 7], buf32,
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rem1000000int64(div1000int64(dots)), file, line,
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strchrnul(prog, '.') - prog, prog, getpid()) <= 0) {
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vflogf_onfail(f);
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}
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(vfprintf)(f, fmt, va);
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fprintf(f, "\n");
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if (bufmode == _IOLBF) {
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f->bufmode = _IOLBF;
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fflush(f);
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}
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if (level == kLogFatal) {
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__start_fatal(file, line);
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strcpy(buf32, "unknown");
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gethostname(buf32, sizeof(buf32));
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(dprintf)(STDERR_FILENO, "fatality %s pid %d\n", buf32, getpid());
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_spunlock(&vflogf_lock);
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__die();
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unreachable;
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}
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__atomic_fetch_add(&__strace, 1, __ATOMIC_RELAXED);
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_spunlock(&vflogf_lock);
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}
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