arch/um/os-Linux/util.c

   1 /*
   2  * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <unistd.h>
   9 #include <limits.h>
  10 #include <setjmp.h>
  11 #include <sys/mman.h>
  12 #include <sys/stat.h>
  13 #include <sys/utsname.h>
  14 #include <sys/param.h>
  15 #include <sys/time.h>
  16 #include "asm/types.h"
  17 #include <ctype.h>
  18 #include <signal.h>
  19 #include <wait.h>
  20 #include <errno.h>
  21 #include <stdarg.h>
  22 #include <sched.h>
  23 #include <termios.h>
  24 #include <string.h>
  25 #include "user_util.h"
  26 #include "kern_util.h"
  27 #include "user.h"
  28 #include "mem_user.h"
  29 #include "init.h"
  30 #include "ptrace_user.h"
  31 #include "uml-config.h"
  32 #include "os.h"
  33 #include "longjmp.h"
  34
  35 void stack_protections(unsigned long address)
  36 {
  37         int prot = PROT_READ | PROT_WRITE | PROT_EXEC;
  38
  39         if(mprotect((void *) address, page_size(), prot) < 0)
  40                 panic("protecting stack failed, errno = %d", errno);
  41 }
  42
  43 void task_protections(unsigned long address)
  44 {
  45         unsigned long guard = address + page_size();
  46         unsigned long stack = guard + page_size();
  47         int prot = 0, pages;
  48
  49 #ifdef notdef
  50         if(mprotect((void *) stack, page_size(), prot) < 0)
  51                 panic("protecting guard page failed, errno = %d", errno);
  52 #endif
  53         pages = (1 << UML_CONFIG_KERNEL_STACK_ORDER) - 2;
  54         prot = PROT_READ | PROT_WRITE | PROT_EXEC;
  55         if(mprotect((void *) stack, pages * page_size(), prot) < 0)
  56                 panic("protecting stack failed, errno = %d", errno);
  57 }
  58
  59 int raw(int fd)
  60 {
  61         struct termios tt;
  62         int err;
  63
  64         CATCH_EINTR(err = tcgetattr(fd, &tt));
  65         if(err < 0)
  66                 return -errno;
  67
  68         cfmakeraw(&tt);
  69
  70         CATCH_EINTR(err = tcsetattr(fd, TCSADRAIN, &tt));
  71         if(err < 0)
  72                 return -errno;
  73
  74         /* XXX tcsetattr could have applied only some changes
  75          * (and cfmakeraw() is a set of changes) */
  76         return(0);
  77 }
  78
  79 void setup_machinename(char *machine_out)
  80 {
  81         struct utsname host;
  82
  83         uname(&host);
  84 #if defined(UML_CONFIG_UML_X86) && !defined(UML_CONFIG_64BIT)
  85         if (!strcmp(host.machine, "x86_64")) {
  86                 strcpy(machine_out, "i686");
  87                 return;
  88         }
  89 #endif
  90         strcpy(machine_out, host.machine);
  91 }
  92
  93 char host_info[(_UTSNAME_LENGTH + 1) * 4 + _UTSNAME_NODENAME_LENGTH + 1];
  94
  95 void setup_hostinfo(void)
  96 {
  97         struct utsname host;
  98
  99         uname(&host);
 100         sprintf(host_info, "%s %s %s %s %s", host.sysname, host.nodename,
 101                 host.release, host.version, host.machine);
 102 }
 103
 104 int setjmp_wrapper(void (*proc)(void *, void *), ...)
 105 {
 106         va_list args;
 107         jmp_buf buf;
 108         int n;
 109
 110         n = sigsetjmp(buf, 1);
 111         if(n == 0){
 112                 va_start(args, proc);
 113                 (*proc)(&buf, &args);
 114         }
 115         va_end(args);
 116         return(n);
 117 }