Category : OS/2 Files
Archive : EMXTST8F.ZIP
Filename : FORK.C
Output of file : FORK.C contained in archive : EMXTST8F.ZIP
#include
#include
#include
#include
#include
#include
#include
static int v = 1;
static void usage (void)
{
puts ("Usage: fork [-r#] [-z#] [-cnqsvw]");
puts ("Options:");
puts (" -r# Set number of recursion levels");
puts (" -z# Sleep for # seconds before forking");
puts (" -c Display clock() value");
puts (" -n Don't use heap");
puts (" -q Be quiet");
puts (" -s Set SIGCLD handler");
puts (" -v Be verbose");
puts (" -w Wait for children");
exit (1);
}
static void handler (int sig)
{
switch (sig)
{
case SIGCLD:
printf ("SIGCLD\n");
break;
default:
printf ("Signal %d\n", sig);
break;
}
fflush (stdout);
signal (SIGCLD, SIG_ACK);
}
int main (int argc, char *argv[])
{
int c, i, n, p, t, v0, rep, opt_c, opt_n, opt_s, opt_w, opt_z, verb;
char buf[32], *fork_name;
rep = 0; opt_c = 0; opt_n = 0; opt_s = 0; opt_w = 0; opt_z = 0; verb = 1;
while ((c = getopt (argc, argv, "cr:nqsvwz:")) != EOF)
switch (c)
{
case 'c':
opt_c = 1;
break;
case 'n':
opt_n = 1;
break;
case 'q':
verb = 0;
break;
case 'r':
rep = atoi (optarg);
break;
case 's':
opt_s = 1;
break;
case 'v':
verb = 2;
break;
case 'w':
opt_w = 1;
break;
case 'z':
opt_z = atoi (optarg);
break;
default:
usage ();
}
if (optind < argc)
usage ();
if (rep > 6)
{
printf ("*** That's too dangerous ***\n");
return (1);
}
if (opt_s)
signal (SIGCLD, handler);
v0 = v;
if (opt_n)
fork_name = "fork";
else
{
printf ("Here's fork%d (pid=%d, ppid=%d)\n", v0,
getpid (), getppid ());
fork_name = strdup ("fork"); /* test heap */
}
n = 0;
do
{
if (opt_z != 0)
sleep (opt_z);
++v;
i = fork();
if (i < 0)
{
sprintf (buf, "fork%d: fork", v0);
perror (buf);
return (1);
}
else if (i == 0)
{
v0 = v; n = 0;
printf ("Here's forked %s%d (pid=%d, ppid=%d)\n",
fork_name, v0, getpid (), getppid ());
}
else
{
++n;
if (verb >= 1)
printf ("fork%d: forked fork has pid %d\n", v0, i);
}
} while (v <= rep);
if (opt_w && n > 0)
{
if (verb >= 2)
printf ("fork%d: waiting for %d child%s\n",
v0, n, (n == 1 ? "" : "ren"));
while (n > 0)
{
p = wait (&t);
if (p == -1)
{
sprintf (buf, "fork%d: wait", v0);
perror (buf);
return (1);
}
else
{
--n;
if ((t & 0xff) == 0)
printf ("fork%d: process %d terminated normally, rc=%d\n",
v0, p, t >> 8);
else if ((t & 0xff) == 127)
printf ("fork%d: process %d stopped by signal %d\n",
v0, p, t >> 8);
else
printf ("fork%d: process %d terminated by signal %d\n",
v0, p, t & 0xff);
}
}
}
if (opt_c)
printf ("fork%d: clock=%ld\n", v0, (long)clock ());
if (verb >= 2)
printf ("fork%d: end\n", v0);
return (0);
}
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But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: http://www.os2museum.com/wp/mtswslnk/