Hi ,
I use busybox version 1.16.1.
I have two processes that have to be running all the time, but with some
differences in behavior.
process 1: This process must be up and running all the time, but need
not be re-run every now and then. All I need is to ensure this process
exits, its automatically re-run.
process 2: this process has a life span of about 20 seconds. So, I need
to make sure every 20 sec, this is run. This process exits
automatically.
In the second case, I use "watch -t -n 25 process2" and that serves my
purpose.
But how do I achieve the process 1 functionality?
BTW, I made a small change in watch.c when -t option is used.
orig code:
if (!(opt & 0x2)) { // no -t
const unsigned time_len = sizeof("1234-67-90 23:56:89");
time_t t;
// STDERR_FILENO is procps3 compat:
// "watch ls 2>/dev/null" does not detect tty size
get_terminal_width_height(STDERR_FILENO, &new_width, NULL);
if (new_width != width) {
width = new_width;
free(header);
header = xasprintf("Every %us: %-*s", period,
(int)width, cmd);
}
time(&t);
if (time_len < width)
strftime(header + width - time_len, time_len,
"%Y-%m-%d %H:%M:%S", localtime(&t));
// compat: empty line between header and cmd output
printf("%s\n\n", header);
}
fflush_all();
my change:
move the fflush_all() into the if condition like this:
if (!(opt & 0x2)) { // no -t
const unsigned time_len = sizeof("1234-67-90 23:56:89");
time_t t;
fflush_all();
....
.....
}
The user specifies the -t option only if he wants to do the "watch"
silently. if the screen refreshes every often, does not look nice.
Comments welcome.
Murali
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