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pexec.c
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pexec.c
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#include <stdio.h>
double load(void)
{
char buf[180];
FILE *f;
char *ind;
char *x, *y, *z, *q;
double d;
bzero(buf, sizeof(buf));
f = popen("uptime", "r");
fgets(buf, sizeof(buf), f);
pclose(f);
ind = rindex(buf, ':');
// load average: 9.73, 9.97, 9.51
ind++;
ind++;
x = ind;
y = index(x, ',');
*y = 0;
y++;
y++;
z = index(y, ',');
*z = 0;
z++;
z++;
q = index(z, '\n');
*q = 0;
// printf("X %s Y %s Z %s\n", x, y, z);
d = atof(x);
return d;
}
int main(int argc, char *argv[]) {
int numproc;
char *p;
int i;
FILE* cmd;
int cmds;
char buf[280];
char **cmdvec;
FILE **procs;
numproc = 4;
p = getenv("NUMPROC");
if (p)
numproc = atoi(p);
cmds = 0;
cmd = fopen(argv[1], "r");
while (!feof(cmd)) {
bzero(buf, sizeof(buf));
fgets(buf, sizeof(buf), cmd);
if (strlen(buf) == 0)
break;
cmds++;
}
rewind(cmd);
i = 0;
cmdvec = calloc(cmds, sizeof(char*));
while (!feof(cmd)) {
bzero(buf, sizeof(buf));
fgets(buf, sizeof(buf), cmd);
if (strlen(buf) == 0)
break;
if (buf[0] == '#') {
i++;
continue;
}
cmdvec[i++] = strdup(buf);
}
double l;
int j;
procs = calloc(cmds, sizeof(FILE*));
for (i = 0; i < cmds; i++) {
if (cmdvec[i])
procs[i] = popen(cmdvec[i], "r");
for (j = 0; j < 10; j++) {
l = load();
if (l > numproc) {
sleep(5);
} else {
break;
}
}
}
for (i = 0; i < cmds; i++) {
if (!procs[i])
continue;
while (!feof(procs[i])) {
bzero(buf, sizeof(buf));
fgets(buf, sizeof(buf), procs[i]);
if (strlen(buf) == 0)
break;
printf("%d %s", i, buf);
}
}
for (i = 0; i < cmds; i++) {
if (!procs[i])
continue;
pclose(procs[i]);
}
}