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tick.c
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tick.c
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#include <unistd.h>
#include <time.h>
#include <signal.h>
/* A simple program that I use when I want to see how much time a specific program spends on specific tasks.
* USAGE: $0 <prog> <progargs>
* I wrote this to analyze where is the bottleneck in my KDE4 startup.
* The idea is pretty simple: this program shows the current time in a specified interval (currently 1 second).
* The external program <prog> that is being is supposed to output some stuff, so that the ticking is mangled with
* this output.
* TODO: add command line options for specifying a ticking interval and date/time format.
* */
inline void usage()
{
write(1, "Usage: tick command [args]\n", 28);
}
void die(int sig)
{
(void) sig;
_exit(0);
}
int main(int argc, char **argv)
{
char buff[35];
struct tm* timeinfo;
time_t t;
size_t len;
pid_t pid;
signal(SIGCHLD, die);
if(argc<2) {
usage();
return 0;
}
pid = fork();
if(pid==-1)
return 21;
if(pid==0)
{
/* Child */
execvp(argv[1], argv+1);
} else {
/* Parent */
while(1)
{
t=time(NULL);
timeinfo=localtime(&t);
len=strftime(buff, 35, "TICK: %d/%m/%y %H:%M:%S\n", timeinfo);
write(1, buff, len);
usleep(1e6);
}
}
_exit(0);
}