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#include <unistd.h>
#include <stdio.h>
#include <signal.h>
#include <stdlib.h>
#include <AK/AKString.h>
static unsigned parse_uint(const String& str, bool& ok)
{
if (str.is_empty()) {
ok = false;
return 0;
}
unsigned value = 0;
for (int i = 0; i < str.length(); ++i) {
if (str[i] < '0' || str[i] > '9') {
ok = false;
return 0;
}
value = value * 10;
value += (unsigned)(str[i] - '0');
}
ok = true;
return value;
}
static void print_usage_and_exit()
{
printf("usage: kill [-signal] <PID>\n");
exit(1);
}
int main(int argc, char** argv)
{
if (argc != 2 && argc != 3)
print_usage_and_exit();
bool ok;
unsigned signum = SIGTERM;
int pid_argi = 1;
if (argc == 3) {
pid_argi = 2;
if (argv[1][0] != '-')
print_usage_and_exit();
signum = parse_uint(&argv[1][1], ok);
if (!ok) {
printf("'%s' is not a valid signal number\n", &argv[1][1]);
return 2;
}
}
unsigned pid = parse_uint(argv[pid_argi], ok);
if (!ok) {
printf("'%s' is not a valid PID\n", argv[pid_argi]);
return 3;
}
int rc = kill((pid_t)pid, signum);
if (rc < 0)
perror("kill");
return 0;
}
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