libgloss/arm/linux-syscalls1.c

   1 /** Linux system call interface.
   2  * Written by Shaun Jackman <sjackman@gmail.com>.
   3  * Copyright 2006 Pathway Connectivity
   4  *
   5  * Permission to use, copy, modify, and distribute this software
   6  * is freely granted, provided that this notice is preserved.
   7  */
   8
   9 #include <errno.h>
  10 #include <stdint.h>
  11
  12 extern char _end[];
  13 static void *curbrk = _end;
  14
  15 extern void *_brk(void *addr);
  16
  17 int brk(void *addr)
  18 {
  19         void *newbrk;
  20         if (curbrk == addr)
  21                 return 0;
  22         newbrk = _brk(addr);
  23         curbrk = newbrk;
  24         if (newbrk < addr) {
  25                 errno = ENOMEM;
  26                 return -1;
  27         }
  28         return 0;
  29 }
  30
  31 void *_sbrk(intptr_t incr)
  32 {
  33         void *oldbrk = curbrk;
  34         if (brk(oldbrk + incr) == -1)
  35                 return (void *)-1;
  36         return oldbrk;
  37 }
  38
  39 void *sbrk(intptr_t incr) __attribute__((alias("_sbrk")));
  40
  41 int _set_errno(int n)
  42 {
  43         if (n < 0) {
  44                 errno = -n;
  45                 return -1;
  46         }
  47         return n;
  48 }
  49
  50 #include <sys/wait.h>
  51
  52 struct rusage;
  53
  54 pid_t wait4(pid_t pid, int *status, int options, struct rusage *rusage);
  55
  56 pid_t _wait(int *status)
  57 {
  58         return wait4(-1, status, 0, NULL);
  59 }
  60
  61 pid_t waitpid(pid_t pid, int *status, int options)
  62 {
  63         return wait4(pid, status, options, NULL);
  64 }
  65
  66 extern int _reboot(int magic, int magic2, int flag, void *arg);
  67
  68 int reboot(int flag)
  69 {
  70         return _reboot(0xfee1dead, 0x28121969, flag, NULL);
  71 }