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#include "lib.h"
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
static int
note(int pid, char *msg, char *fmt)
{
int f;
char pname[50];
sprintf(pname, fmt, pid);
f = open(pname, O_WRONLY);
if(f < 0){
errno = ESRCH;
return -1;
}
if(msg != 0 && write(f, msg, strlen(msg)) < 0){
close(f);
errno = EPERM;
return -1;
}
close(f);
return 0;
}
int
kill(pid_t pid, int sig)
{
char *msg;
int sid, r, mpid;
if(sig == 0)
msg = 0;
else {
msg = _sigstring(sig);
if(msg == 0) {
errno = EINVAL;
return -1;
}
}
if(pid < 0) {
sid = getpgrp();
mpid = getpid();
if(setpgid(mpid, -pid) == 0) {
r = note(mpid, msg, "/proc/%d/notepg");
setpgid(mpid, sid);
} else {
r = -1;
}
} else if(pid == 0)
r = note(getpid(), msg, "/proc/%d/notepg");
else
r = note(pid, msg, "/proc/%d/note");
return r;
}
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