kernel/sys.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47

#include <errno.h>
#include <kernel/con.h>
#include <kernel/sched.h>
#include <signal.h>
#include <stdint.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>

int sys_puts(char *s) {
  printk("[%04x] ", ctask->pid);
  return printk(s);
}

time_t sys_time(void) {
  return ticks / 100;
}

pid_t sys_getpid(void) {
  return ctask->pid;
}

void *sys_getpdir(void) {
  uint32_t pdir;

  __asm__ ("mov %%cr3, %%eax" : "=a" (pdir));

  return (void*) pdir;
}

void *sys_signal(int sig, void (*func)(int)) {
  if(sig < 0 || sig >= NRSIG)
    return NULL;

  /* SIGKILL and SIGSTOP cannot be caught */
  if(sig == SIGKILL || sig == SIGSTOP)
    return NULL;

  printk("Task %x registered new signal handler 0x%08x for signal %01x\n", ctask->pid, (uint32_t) func, sig);
  ctask->sig_handlers[sig] = func;

  return func;
}

int sys_dummy(void) {
  return -ENOSYS;
}