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/arch/um/kernel/user_util.c

https://bitbucket.org/evzijst/gittest
C | 173 lines | 136 code | 21 blank | 16 comment | 28 complexity | 54f1d95a58985ec54fef5258bb23508a MD5 | raw file
  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 "helper.h"
 31#include "ptrace_user.h"
 32#include "uml-config.h"
 33
 34void stop(void)
 35{
 36	while(1) sleep(1000000);
 37}
 38
 39void stack_protections(unsigned long address)
 40{
 41	int prot = PROT_READ | PROT_WRITE | PROT_EXEC;
 42
 43        if(mprotect((void *) address, page_size(), prot) < 0)
 44		panic("protecting stack failed, errno = %d", errno);
 45}
 46
 47void task_protections(unsigned long address)
 48{
 49	unsigned long guard = address + page_size();
 50	unsigned long stack = guard + page_size();
 51	int prot = 0, pages;
 52
 53#ifdef notdef
 54	if(mprotect((void *) stack, page_size(), prot) < 0)
 55		panic("protecting guard page failed, errno = %d", errno);
 56#endif
 57	pages = (1 << UML_CONFIG_KERNEL_STACK_ORDER) - 2;
 58	prot = PROT_READ | PROT_WRITE | PROT_EXEC;
 59	if(mprotect((void *) stack, pages * page_size(), prot) < 0)
 60		panic("protecting stack failed, errno = %d", errno);
 61}
 62
 63int wait_for_stop(int pid, int sig, int cont_type, void *relay)
 64{
 65	sigset_t *relay_signals = relay;
 66	int status, ret;
 67
 68	while(1){
 69		CATCH_EINTR(ret = waitpid(pid, &status, WUNTRACED));
 70		if((ret < 0) ||
 71		   !WIFSTOPPED(status) || (WSTOPSIG(status) != sig)){
 72			if(ret < 0){
 73				printk("wait failed, errno = %d\n",
 74				       errno);
 75			}
 76			else if(WIFEXITED(status)) 
 77				printk("process %d exited with status %d\n",
 78				       pid, WEXITSTATUS(status));
 79			else if(WIFSIGNALED(status))
 80				printk("process %d exited with signal %d\n",
 81				       pid, WTERMSIG(status));
 82			else if((WSTOPSIG(status) == SIGVTALRM) ||
 83				(WSTOPSIG(status) == SIGALRM) ||
 84				(WSTOPSIG(status) == SIGIO) ||
 85				(WSTOPSIG(status) == SIGPROF) ||
 86				(WSTOPSIG(status) == SIGCHLD) ||
 87				(WSTOPSIG(status) == SIGWINCH) ||
 88				(WSTOPSIG(status) == SIGINT)){
 89				ptrace(cont_type, pid, 0, WSTOPSIG(status));
 90				continue;
 91			}
 92			else if((relay_signals != NULL) &&
 93				sigismember(relay_signals, WSTOPSIG(status))){
 94				ptrace(cont_type, pid, 0, WSTOPSIG(status));
 95				continue;
 96			}
 97			else printk("process %d stopped with signal %d\n",
 98				    pid, WSTOPSIG(status));
 99			panic("wait_for_stop failed to wait for %d to stop "
100			      "with %d\n", pid, sig);
101		}
102		return(status);
103	}
104}
105
106int raw(int fd)
107{
108	struct termios tt;
109	int err;
110
111	CATCH_EINTR(err = tcgetattr(fd, &tt));
112	if (err < 0) {
113			printk("tcgetattr failed, errno = %d\n", errno);
114		return(-errno);
115	}
116
117	cfmakeraw(&tt);
118
119 	CATCH_EINTR(err = tcsetattr(fd, TCSADRAIN, &tt));
120	if (err < 0) {
121			printk("tcsetattr failed, errno = %d\n", errno);
122		return(-errno);
123	}
124
125	/* XXX tcsetattr could have applied only some changes
126	 * (and cfmakeraw() is a set of changes) */
127	return(0);
128}
129
130void setup_machinename(char *machine_out)
131{
132	struct utsname host;
133
134	uname(&host);
135	strcpy(machine_out, host.machine);
136}
137
138char host_info[(_UTSNAME_LENGTH + 1) * 4 + _UTSNAME_NODENAME_LENGTH + 1];
139
140void setup_hostinfo(void)
141{
142	struct utsname host;
143
144	uname(&host);
145	sprintf(host_info, "%s %s %s %s %s", host.sysname, host.nodename,
146		host.release, host.version, host.machine);
147}
148
149int setjmp_wrapper(void (*proc)(void *, void *), ...)
150{
151        va_list args;
152	sigjmp_buf buf;
153	int n;
154
155	n = sigsetjmp(buf, 1);
156	if(n == 0){
157		va_start(args, proc);
158		(*proc)(&buf, &args);
159	}
160	va_end(args);
161	return(n);
162}
163
164/*
165 * Overrides for Emacs so that we follow Linus's tabbing style.
166 * Emacs will notice this stuff at the end of the file and automatically
167 * adjust the settings for this buffer only.  This must remain at the end
168 * of the file.
169 * ---------------------------------------------------------------------------
170 * Local variables:
171 * c-file-style: "linux"
172 * End:
173 */