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Improve deltaify.com program

Browse source 
This program deserves its own project page on http://justine.lol since
it's so good at troubleshooting latency, e.g. `make |& deltaify.com`
This commit is contained in:
Justine Tunney 2021-08-17 00:06:45 -07:00
parent bc464a8898
commit 3d0347e26e
2 changed files with 13 additions and 106 deletions
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19
tool/build/deltaify.c
View file

@ -39,16 +39,16 @@ static void RelaySig(int sig, struct siginfo *si, struct ucontext *uc) {
int main(int argc, char *argv[]) {
FILE *f;
char *s;
bool ok;
char *s, *p;
int64_t micros;
long double t1, t2;
int ws, pipefds[2];
setvbuf(stdout, malloc(BUFSIZ), _IOLBF, BUFSIZ);
setvbuf(stderr, malloc(BUFSIZ), _IOLBF, BUFSIZ);
t1 = nowl();
if (argc < 2) {
f = stdin;
t1 = nowl();
} else {
sigset_t block, mask;
struct sigaction saignore = {.sa_handler = SIG_IGN};
@ -77,18 +77,25 @@ int main(int argc, char *argv[]) {
execvp(argv[1], argv + 1);
_exit(127);
}
t1 = nowl();
close(pipefds[1]);
sigprocmask(SIG_SETMASK, &mask, NULL);
CHECK((f = fdopen(pipefds[0], "r")));
CHECK_NE(-1, setvbuf(f, malloc(4096), _IOLBF, 4096));
}
for (;;) {
if (!(s = xgetline(f))) break;
if ((p = xgetline(f))) {
t2 = nowl();
micros = (t2 - t1) * 1e6;
t1 = t2;
printf("%16ld %s", micros, s);
free(s);
printf("%16ld\n", micros);
do {
s = xgetline(f);
t2 = nowl();
micros = (t2 - t1) * 1e6;
t1 = t2;
printf("%16ld %s", micros, p);
free(p);
} while ((p = s));
}
ok = !ferror(f);
if (argc < 2) return ok ? 0 : 1;