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canbusload: Follow Bash exit status when signaled

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Bash and many other shells use 128 + signum as the exit status when a
program get signal and exit.  Follow the common behavior so that we
know how the programs are killed.

canbusload.c was using a non-safe function, exit(3), in the signal
handler.  This commit replaces it with the way other programs in
can-utils are using; set running = 0 to exit from the while loop.

Signed-off-by: Yasushi SHOJI <yashi@spacecubics.com>
This commit is contained in:
Yasushi SHOJI
2023-03-20 10:22:41 +09:00
parent 180eceff4d
commit 16a717c81e
1 changed files with 8 additions and 2 deletions
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canbusload.c
+8 -2
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@@ -82,6 +82,8 @@ static struct {
unsigned int recv_bits_dbitrate; unsigned int recv_bits_dbitrate;
} stat[MAXSOCK+1]; } stat[MAXSOCK+1];
static volatile int running = 1;
static volatile sig_atomic_t signal_num;
static int max_devname_len; /* to prevent frazzled device name output */ static int max_devname_len; /* to prevent frazzled device name output */
static int max_bitrate_len; static int max_bitrate_len;
static int currmax; static int currmax;
@@ -124,7 +126,8 @@ void print_usage(char *prg)
void sigterm(int signo) void sigterm(int signo)
{ {
exit(0); running = 0;
signal_num = signo;
} }
void printstats(int signo) void printstats(int signo)
@@ -382,7 +385,7 @@ int main(int argc, char **argv)
if (redraw) if (redraw)
printf("%s", CLR_SCREEN); printf("%s", CLR_SCREEN);
while (1) { while (running) {
FD_ZERO(&rdfs); FD_ZERO(&rdfs);
for (i=0; i<currmax; i++) for (i=0; i<currmax; i++)
@@ -425,5 +428,8 @@ int main(int argc, char **argv)
for (i=0; i<currmax; i++) for (i=0; i<currmax; i++)
close(s[i]); close(s[i]);
if (signal_num)
return 128 + signal_num;
return 0; return 0;
} }