331 строка
7.3 KiB
C
331 строка
7.3 KiB
C
/*
|
|
* Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <dirent.h>
|
|
#include <signal.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/param.h>
|
|
#include "user.h"
|
|
#include "umid.h"
|
|
#include "init.h"
|
|
#include "os.h"
|
|
#include "user_util.h"
|
|
#include "choose-mode.h"
|
|
|
|
#define UMID_LEN 64
|
|
#define UML_DIR "~/.uml/"
|
|
|
|
/* Changed by set_umid and make_umid, which are run early in boot */
|
|
static char umid[UMID_LEN] = { 0 };
|
|
|
|
/* Changed by set_uml_dir and make_uml_dir, which are run early in boot */
|
|
static char *uml_dir = UML_DIR;
|
|
|
|
/* Changed by set_umid */
|
|
static int umid_is_random = 1;
|
|
static int umid_inited = 0;
|
|
/* Have we created the files? Should we remove them? */
|
|
static int umid_owned = 0;
|
|
|
|
static int make_umid(int (*printer)(const char *fmt, ...));
|
|
|
|
static int __init set_umid(char *name, int is_random,
|
|
int (*printer)(const char *fmt, ...))
|
|
{
|
|
if(umid_inited){
|
|
(*printer)("Unique machine name can't be set twice\n");
|
|
return(-1);
|
|
}
|
|
|
|
if(strlen(name) > UMID_LEN - 1)
|
|
(*printer)("Unique machine name is being truncated to %d "
|
|
"characters\n", UMID_LEN);
|
|
strlcpy(umid, name, sizeof(umid));
|
|
|
|
umid_is_random = is_random;
|
|
umid_inited = 1;
|
|
return 0;
|
|
}
|
|
|
|
static int __init set_umid_arg(char *name, int *add)
|
|
{
|
|
*add = 0;
|
|
return(set_umid(name, 0, printf));
|
|
}
|
|
|
|
__uml_setup("umid=", set_umid_arg,
|
|
"umid=<name>\n"
|
|
" This is used to assign a unique identity to this UML machine and\n"
|
|
" is used for naming the pid file and management console socket.\n\n"
|
|
);
|
|
|
|
int __init umid_file_name(char *name, char *buf, int len)
|
|
{
|
|
int n;
|
|
|
|
if(!umid_inited && make_umid(printk)) return(-1);
|
|
|
|
n = strlen(uml_dir) + strlen(umid) + strlen(name) + 1;
|
|
if(n > len){
|
|
printk("umid_file_name : buffer too short\n");
|
|
return(-1);
|
|
}
|
|
|
|
sprintf(buf, "%s%s/%s", uml_dir, umid, name);
|
|
return(0);
|
|
}
|
|
|
|
extern int tracing_pid;
|
|
|
|
static void __init create_pid_file(void)
|
|
{
|
|
char file[strlen(uml_dir) + UMID_LEN + sizeof("/pid\0")];
|
|
char pid[sizeof("nnnnn\0")];
|
|
int fd, n;
|
|
|
|
if(umid_file_name("pid", file, sizeof(file)))
|
|
return;
|
|
|
|
fd = os_open_file(file, of_create(of_excl(of_rdwr(OPENFLAGS()))),
|
|
0644);
|
|
if(fd < 0){
|
|
printf("Open of machine pid file \"%s\" failed: %s\n",
|
|
file, strerror(-fd));
|
|
return;
|
|
}
|
|
|
|
sprintf(pid, "%d\n", os_getpid());
|
|
n = os_write_file(fd, pid, strlen(pid));
|
|
if(n != strlen(pid))
|
|
printf("Write of pid file failed - err = %d\n", -n);
|
|
os_close_file(fd);
|
|
}
|
|
|
|
static int actually_do_remove(char *dir)
|
|
{
|
|
DIR *directory;
|
|
struct dirent *ent;
|
|
int len;
|
|
char file[256];
|
|
|
|
directory = opendir(dir);
|
|
if(directory == NULL){
|
|
printk("actually_do_remove : couldn't open directory '%s', "
|
|
"errno = %d\n", dir, errno);
|
|
return(1);
|
|
}
|
|
while((ent = readdir(directory)) != NULL){
|
|
if(!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, ".."))
|
|
continue;
|
|
len = strlen(dir) + sizeof("/") + strlen(ent->d_name) + 1;
|
|
if(len > sizeof(file)){
|
|
printk("Not deleting '%s' from '%s' - name too long\n",
|
|
ent->d_name, dir);
|
|
continue;
|
|
}
|
|
sprintf(file, "%s/%s", dir, ent->d_name);
|
|
if(unlink(file) < 0){
|
|
printk("actually_do_remove : couldn't remove '%s' "
|
|
"from '%s', errno = %d\n", ent->d_name, dir,
|
|
errno);
|
|
return(1);
|
|
}
|
|
}
|
|
if(rmdir(dir) < 0){
|
|
printk("actually_do_remove : couldn't rmdir '%s', "
|
|
"errno = %d\n", dir, errno);
|
|
return(1);
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
void remove_umid_dir(void)
|
|
{
|
|
char dir[strlen(uml_dir) + UMID_LEN + 1];
|
|
if (!umid_owned)
|
|
return;
|
|
|
|
sprintf(dir, "%s%s", uml_dir, umid);
|
|
actually_do_remove(dir);
|
|
}
|
|
|
|
char *get_umid(int only_if_set)
|
|
{
|
|
if(only_if_set && umid_is_random)
|
|
return NULL;
|
|
return umid;
|
|
}
|
|
|
|
static int not_dead_yet(char *dir)
|
|
{
|
|
char file[strlen(uml_dir) + UMID_LEN + sizeof("/pid\0")];
|
|
char pid[sizeof("nnnnn\0")], *end;
|
|
int dead, fd, p, n;
|
|
|
|
sprintf(file, "%s/pid", dir);
|
|
dead = 0;
|
|
fd = os_open_file(file, of_read(OPENFLAGS()), 0);
|
|
if(fd < 0){
|
|
if(fd != -ENOENT){
|
|
printk("not_dead_yet : couldn't open pid file '%s', "
|
|
"err = %d\n", file, -fd);
|
|
return(1);
|
|
}
|
|
dead = 1;
|
|
}
|
|
if(fd > 0){
|
|
n = os_read_file(fd, pid, sizeof(pid));
|
|
if(n < 0){
|
|
printk("not_dead_yet : couldn't read pid file '%s', "
|
|
"err = %d\n", file, -n);
|
|
return(1);
|
|
}
|
|
p = strtoul(pid, &end, 0);
|
|
if(end == pid){
|
|
printk("not_dead_yet : couldn't parse pid file '%s', "
|
|
"errno = %d\n", file, errno);
|
|
dead = 1;
|
|
}
|
|
if(((kill(p, 0) < 0) && (errno == ESRCH)) ||
|
|
(p == CHOOSE_MODE(tracing_pid, os_getpid())))
|
|
dead = 1;
|
|
}
|
|
if(!dead)
|
|
return(1);
|
|
return(actually_do_remove(dir));
|
|
}
|
|
|
|
static int __init set_uml_dir(char *name, int *add)
|
|
{
|
|
if((strlen(name) > 0) && (name[strlen(name) - 1] != '/')){
|
|
uml_dir = malloc(strlen(name) + 2);
|
|
if(uml_dir == NULL){
|
|
printf("Failed to malloc uml_dir - error = %d\n",
|
|
errno);
|
|
uml_dir = name;
|
|
/* Return 0 here because do_initcalls doesn't look at
|
|
* the return value.
|
|
*/
|
|
return(0);
|
|
}
|
|
sprintf(uml_dir, "%s/", name);
|
|
}
|
|
else uml_dir = name;
|
|
return(0);
|
|
}
|
|
|
|
static int __init make_uml_dir(void)
|
|
{
|
|
char dir[MAXPATHLEN + 1] = { '\0' };
|
|
int len;
|
|
|
|
if(*uml_dir == '~'){
|
|
char *home = getenv("HOME");
|
|
|
|
if(home == NULL){
|
|
printf("make_uml_dir : no value in environment for "
|
|
"$HOME\n");
|
|
exit(1);
|
|
}
|
|
strlcpy(dir, home, sizeof(dir));
|
|
uml_dir++;
|
|
}
|
|
strlcat(dir, uml_dir, sizeof(dir));
|
|
len = strlen(dir);
|
|
if (len > 0 && dir[len - 1] != '/')
|
|
strlcat(dir, "/", sizeof(dir));
|
|
|
|
uml_dir = malloc(strlen(dir) + 1);
|
|
if (uml_dir == NULL) {
|
|
printf("make_uml_dir : malloc failed, errno = %d\n", errno);
|
|
exit(1);
|
|
}
|
|
strcpy(uml_dir, dir);
|
|
|
|
if((mkdir(uml_dir, 0777) < 0) && (errno != EEXIST)){
|
|
printf("Failed to mkdir %s: %s\n", uml_dir, strerror(errno));
|
|
return(-1);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int __init make_umid(int (*printer)(const char *fmt, ...))
|
|
{
|
|
int fd, err;
|
|
char tmp[strlen(uml_dir) + UMID_LEN + 1];
|
|
|
|
strlcpy(tmp, uml_dir, sizeof(tmp));
|
|
|
|
if(!umid_inited){
|
|
strcat(tmp, "XXXXXX");
|
|
fd = mkstemp(tmp);
|
|
if(fd < 0){
|
|
(*printer)("make_umid - mkstemp(%s) failed: %s\n",
|
|
tmp,strerror(errno));
|
|
return(1);
|
|
}
|
|
|
|
os_close_file(fd);
|
|
/* There's a nice tiny little race between this unlink and
|
|
* the mkdir below. It'd be nice if there were a mkstemp
|
|
* for directories.
|
|
*/
|
|
unlink(tmp);
|
|
set_umid(&tmp[strlen(uml_dir)], 1, printer);
|
|
}
|
|
|
|
sprintf(tmp, "%s%s", uml_dir, umid);
|
|
|
|
err = mkdir(tmp, 0777);
|
|
if(err < 0){
|
|
if(errno == EEXIST){
|
|
if(not_dead_yet(tmp)){
|
|
(*printer)("umid '%s' is in use\n", umid);
|
|
umid_owned = 0;
|
|
return(-1);
|
|
}
|
|
err = mkdir(tmp, 0777);
|
|
}
|
|
}
|
|
if(err < 0){
|
|
(*printer)("Failed to create %s - errno = %d\n", umid, errno);
|
|
return(-1);
|
|
}
|
|
|
|
umid_owned = 1;
|
|
return 0;
|
|
}
|
|
|
|
__uml_setup("uml_dir=", set_uml_dir,
|
|
"uml_dir=<directory>\n"
|
|
" The location to place the pid and umid files.\n\n"
|
|
);
|
|
|
|
static int __init make_umid_setup(void)
|
|
{
|
|
/* one function with the ordering we need ... */
|
|
make_uml_dir();
|
|
make_umid(printf);
|
|
create_pid_file();
|
|
return 0;
|
|
}
|
|
__uml_postsetup(make_umid_setup);
|
|
|
|
/*
|
|
* Overrides for Emacs so that we follow Linus's tabbing style.
|
|
* Emacs will notice this stuff at the end of the file and automatically
|
|
* adjust the settings for this buffer only. This must remain at the end
|
|
* of the file.
|
|
* ---------------------------------------------------------------------------
|
|
* Local variables:
|
|
* c-file-style: "linux"
|
|
* End:
|
|
*/
|