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Add pidfile option 

Signed-off-by: Serj Kalichev <serj.kalichev@gmail.com>
Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
This commit is contained in:
Serj Kalichev 2012-03-26 21:30:34 +04:00 committed by Neil Horman
parent 34b9442727
commit af97025ecb
2 changed files with 32 additions and 2 deletions
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6
irqbalance.1
View File

@ -73,6 +73,12 @@ Add the specified irq list to the set of banned irqs. irqbalance will not affect
the affinity of any irqs on the banned list, allowing them to be specified
manually. This option is addative and can be specified multiple times
.TP
.B --pid=<file>
Have irqbalance write its process id to the specified file. By default no
pidfile is written. The written pidfile is automatically unlinked when
irqbalance exits.
.SH "ENVIRONMENT VARIABLES"
.TP
.B IRQBALANCE_ONESHOT

28
irqbalance.c
View File

@ -28,6 +28,9 @@
#include <unistd.h>
#include <signal.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifdef HAVE_GETOPT_LONG
#include <getopt.h>
#endif
@ -47,6 +50,7 @@ extern cpumask_t banned_cpus;
enum hp_e hint_policy = HINT_POLICY_SUBSET;
unsigned long power_thresh = ULONG_MAX;
unsigned long long cycle_count = 0;
char *pidfile = NULL;
void sleep_approx(int seconds)
{
@ -70,6 +74,7 @@ struct option lopts[] = {
{"hintpolicy", 1, NULL, 'h'},
{"powerthresh", 1, NULL, 'p'},
{"banirq", 1 , NULL, 'i'},
{"pid", 1, NULL, 's'},
{0, 0, 0, 0}
};
@ -86,7 +91,7 @@ static void parse_command_line(int argc, char **argv)
unsigned long val;
while ((opt = getopt_long(argc, argv,
"odfh:i:p:",
"odfh:i:p:s:",
lopts, &longind)) != -1) {
switch(opt) {
@ -134,6 +139,9 @@ static void parse_command_line(int argc, char **argv)
case 'o':
one_shot_mode=1;
break;
case 's':
pidfile = optarg;
break;
}
}
}
@ -239,9 +247,20 @@ int main(int argc, char** argv)
if (cache_domain_count==1)
one_shot_mode = 1;
if (!foreground_mode)
if (!foreground_mode) {
int pidfd = -1;
if (daemon(0,0))
exit(EXIT_FAILURE);
/* Write pidfile */
if (pidfile && (pidfd = open(pidfile,
O_WRONLY | O_CREAT | O_EXCL | O_TRUNC,
S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) >= 0) {
char str[16];
snprintf(str, sizeof(str), "%u\n", getpid());
write(pidfd, str, strlen(str));
close(pidfd);
}
}
openlog(argv[0], 0, LOG_DAEMON);
@ -303,5 +322,10 @@ int main(int argc, char** argv)
}
free_object_tree();
/* Remove pidfile */
if (!foreground_mode && pidfile)
unlink(pidfile);
return EXIT_SUCCESS;
}