arch/um/kernel/user_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 <sys/mman.h>
  11 #include <sys/stat.h>
  12 #include <sys/ptrace.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 "helper.h"
  31 #include "uml-config.h"
  32
  33 #define COMMAND_LINE_SIZE _POSIX_ARG_MAX
  34
  35 /* Changed in linux_main and setup_arch, which run before SMP is started */
  36 char command_line[COMMAND_LINE_SIZE] = { 0 };
  37
  38 void add_arg(char *cmd_line, char *arg)
  39 {
  40         if (strlen(cmd_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
  41                 printf("add_arg: Too much command line!\n");
  42                 exit(1);
  43         }
  44         if(strlen(cmd_line) > 0) strcat(cmd_line, " ");
  45         strcat(cmd_line, arg);
  46 }
  47
  48 void stop(void)
  49 {
  50         while(1) sleep(1000000);
  51 }
  52
  53 void stack_protections(unsigned long address)
  54 {
  55         int prot = PROT_READ | PROT_WRITE | PROT_EXEC;
  56
  57         if(mprotect((void *) address, page_size(), prot) < 0)
  58                 panic("protecting stack failed, errno = %d", errno);
  59 }
  60
  61 void task_protections(unsigned long address)
  62 {
  63         unsigned long guard = address + page_size();
  64         unsigned long stack = guard + page_size();
  65         int prot = 0, pages;
  66
  67 #ifdef notdef
  68         if(mprotect((void *) stack, page_size(), prot) < 0)
  69                 panic("protecting guard page failed, errno = %d", errno);
  70 #endif
  71         pages = (1 << UML_CONFIG_KERNEL_STACK_ORDER) - 2;
  72         prot = PROT_READ | PROT_WRITE | PROT_EXEC;
  73         if(mprotect((void *) stack, pages * page_size(), prot) < 0)
  74                 panic("protecting stack failed, errno = %d", errno);
  75 }
  76
  77 int wait_for_stop(int pid, int sig, int cont_type, void *relay)
  78 {
  79         sigset_t *relay_signals = relay;
  80         int status, ret;
  81
  82         while(1){
  83                 ret = waitpid(pid, &status, WUNTRACED);
  84                 if((ret < 0) ||
  85                    !WIFSTOPPED(status) || (WSTOPSIG(status) != sig)){
  86                         if(ret < 0){
  87                                 if(errno == EINTR) continue;
  88                                 printk("wait failed, errno = %d\n",
  89                                        errno);
  90                         }
  91                         else if(WIFEXITED(status))
  92                                 printk("process exited with status %d\n",
  93                                        WEXITSTATUS(status));
  94                         else if(WIFSIGNALED(status))
  95                                 printk("process exited with signal %d\n",
  96                                        WTERMSIG(status));
  97                         else if((WSTOPSIG(status) == SIGVTALRM) ||
  98                                 (WSTOPSIG(status) == SIGALRM) ||
  99                                 (WSTOPSIG(status) == SIGIO) ||
 100                                 (WSTOPSIG(status) == SIGPROF) ||
 101                                 (WSTOPSIG(status) == SIGCHLD) ||
 102                                 (WSTOPSIG(status) == SIGWINCH) ||
 103                                 (WSTOPSIG(status) == SIGINT)){
 104                                 ptrace(cont_type, pid, 0, WSTOPSIG(status));
 105                                 continue;
 106                         }
 107                         else if((relay_signals != NULL) &&
 108                                 sigismember(relay_signals, WSTOPSIG(status))){
 109                                 ptrace(cont_type, pid, 0, WSTOPSIG(status));
 110                                 continue;
 111                         }
 112                         else printk("process stopped with signal %d\n",
 113                                     WSTOPSIG(status));
 114                         panic("wait_for_stop failed to wait for %d to stop "
 115                               "with %d\n", pid, sig);
 116                 }
 117                 return(status);
 118         }
 119 }
 120
 121 int raw(int fd, int complain)
 122 {
 123         struct termios tt;
 124         int err;
 125
 126         tcgetattr(fd, &tt);
 127         cfmakeraw(&tt);
 128         err = tcsetattr(fd, TCSANOW, &tt);
 129         if((err < 0) && complain){
 130                 printk("tcsetattr failed, errno = %d\n", errno);
 131                 return(-errno);
 132         }
 133         return(0);
 134 }
 135
 136 void setup_machinename(char *machine_out)
 137 {
 138         struct utsname host;
 139
 140         uname(&host);
 141         strcpy(machine_out, host.machine);
 142 }
 143
 144 char host_info[(_UTSNAME_LENGTH + 1) * 4 + _UTSNAME_NODENAME_LENGTH + 1];
 145
 146 void setup_hostinfo(void)
 147 {
 148         struct utsname host;
 149
 150         uname(&host);
 151         sprintf(host_info, "%s %s %s %s %s", host.sysname, host.nodename,
 152                 host.release, host.version, host.machine);
 153 }
 154
 155 /*
 156  * Overrides for Emacs so that we follow Linus's tabbing style.
 157  * Emacs will notice this stuff at the end of the file and automatically
 158  * adjust the settings for this buffer only.  This must remain at the end
 159  * of the file.
 160  * ---------------------------------------------------------------------------
 161  * Local variables:
 162  * c-file-style: "linux"
 163  * End:
 164  */