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Use re-entrant locks on stdio

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This commit is contained in:
Justine Tunney 2022-05-22 08:13:13 -07:00
parent 4e9662cbc7
commit 1f229e4efc
78 changed files with 427 additions and 179 deletions
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41
libc/log/vflogf.c
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@ -41,24 +41,25 @@
#define kNontrivialSize (8 * 1000 * 1000)
static struct timespec vflogf_ts;
_Alignas(64) static int vflogf_lock;
/**
* Takes corrective action if logging is on the fritz.
*/
void vflogf_onfail(FILE *f) {
static void vflogf_onfail(FILE *f) {
errno_t err;
int64_t size;
if (IsTiny()) return;
err = ferror(f);
if (fileno(f) != -1 && (err == ENOSPC || err == EDQUOT || err == EFBIG) &&
((size = getfiledescriptorsize(fileno(f))) == -1 ||
err = ferror_unlocked(f);
if (fileno_unlocked(f) != -1 &&
(err == ENOSPC || err == EDQUOT || err == EFBIG) &&
((size = getfiledescriptorsize(fileno_unlocked(f))) == -1 ||
size > kNontrivialSize)) {
ftruncate(fileno(f), 0);
fseek(f, SEEK_SET, 0);
ftruncate(fileno_unlocked(f), 0);
fseeko_unlocked(f, SEEK_SET, 0);
f->beg = f->end = 0;
clearerr(f);
(fprintf)(f, "performed emergency log truncation: %s\n", strerror(err));
clearerr_unlocked(f);
(fprintf_unlocked)(f, "performed emergency log truncation: %s\n",
strerror(err));
}
}
@ -88,8 +89,8 @@ void(vflogf)(unsigned level, const char *file, int line, FILE *f,
int64_t secs, nsec, dots;
if (!f) f = __log_file;
if (!f) return;
_spinlock(&vflogf_lock);
__atomic_fetch_sub(&__strace, 1, __ATOMIC_RELAXED);
flockfile(f);
--__strace;
t2 = nowl();
secs = t2;
@ -105,16 +106,17 @@ void(vflogf)(unsigned level, const char *file, int line, FILE *f,
bufmode = f->bufmode;
if (bufmode == _IOLBF) f->bufmode = _IOFBF;
if ((fprintf)(f, "%r%c%s%06ld:%s:%d:%.*s:%d] ", "FEWIVDNT"[level & 7], buf32,
rem1000000int64(div1000int64(dots)), file, line,
strchrnul(prog, '.') - prog, prog, getpid()) <= 0) {
if ((fprintf_unlocked)(f, "%r%c%s%06ld:%s:%d:%.*s:%d] ",
"FEWIVDNT"[level & 7], buf32,
rem1000000int64(div1000int64(dots)), file, line,
strchrnul(prog, '.') - prog, prog, getpid()) <= 0) {
vflogf_onfail(f);
}
(vfprintf)(f, fmt, va);
fprintf(f, "\n");
(vfprintf_unlocked)(f, fmt, va);
fputc_unlocked('\n', f);
if (bufmode == _IOLBF) {
f->bufmode = _IOLBF;
fflush(f);
fflush_unlocked(f);
}
if (level == kLogFatal) {
@ -122,11 +124,10 @@ void(vflogf)(unsigned level, const char *file, int line, FILE *f,
strcpy(buf32, "unknown");
gethostname(buf32, sizeof(buf32));
(dprintf)(STDERR_FILENO, "fatality %s pid %d\n", buf32, getpid());
_spunlock(&vflogf_lock);
__die();
unreachable;
}
__atomic_fetch_add(&__strace, 1, __ATOMIC_RELAXED);
_spunlock(&vflogf_lock);
++__strace;
funlockfile(f);
}