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Change how SIGINFO is handled -- set a flag (of sig_atomic_t), and check

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that flag on every iteration of the loop.  This avoids calling fprintf
inside a signal handler, which is always somewhat icky.

Reviewed by:	bde
This commit is contained in:
Sean Eric Fagan 1996-12-07 20:20:41 +00:00
parent c918e9eece
commit 37e5b2c618
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=20195
1 changed files with 34 additions and 15 deletions
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31
sbin/ping/ping.c
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@ -139,9 +139,10 @@ double tmax = 0.0; /* maximum round trip time */
double tsum = 0.0; /* sum of all times, for doing average */
int reset_kerninfo;
sig_atomic_t siginfo_p;
char *pr_addr();
void catcher(), finish(), status();
void catcher(), finish(), status(), check_status();
main(argc, argv)
int argc;
@ -161,6 +162,7 @@ main(argc, argv)
#ifdef IP_OPTIONS
char rspace[3 + 4 * NROUTES + 1]; /* record route space */
#endif
struct sigaction si_sa;
/*
* Do the stuff that we need root priv's for *first*, and
@ -356,6 +358,14 @@ main(argc, argv)
(void)signal(SIGALRM, catcher);
(void)signal(SIGINFO, status);
si_sa.sa_handler = status;
sigemtpyset(&si_sa.sa_mask);
si_sa.sa_flags = 0;
if (sigaction(SIGINFO, &si_sa, 0) == -1) {
perror("sigaction");
exit(1);
}
if (tcgetattr(STDOUT_FILENO, &ts) != -1) {
reset_kerninfo = !(ts.c_lflag & NOKERNINFO);
ts.c_lflag |= NOKERNINFO;
@ -368,7 +378,7 @@ main(argc, argv)
if ((options & F_FLOOD) == 0)
catcher(); /* start things going */
for (;;) {
for (;;check_status()) {
struct sockaddr_in from;
register int cc;
int fromlen;
@ -739,9 +749,16 @@ tvsub(out, in)
*/
void
status()
status() {
siginfo_p = 1;
}
void
check_status()
{
double temp_min = nreceived ? tmin : 0;
if (siginfo_p) {
(void)fprintf(stderr, "%ld/%ld packets received (%ld%%) "
"%.3f min / %.3f avg / %.3f max\n",
nreceived, ntransmitted,
@ -750,10 +767,12 @@ status()
/ ntransmitted)
: 0),
temp_min,
((nreceived + nrepeats) ?
(tsum / (nreceived + nrepeats))
: tsum),
(nreceived + nrepeats) ?
tsum / (nreceived + nrepeats)
: tsum,
tmax);
siginfo_p = 0;
}
}
/*