+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
#include <stdio.h>
-#include <unistd.h>
#include <stdlib.h>
-#include <string.h>
+#include <dirent.h>
#include <errno.h>
+#include <fcntl.h>
#include <signal.h>
-#include <dirent.h>
-#include <sys/fcntl.h>
+#include <string.h>
+#include <unistd.h>
#include <sys/stat.h>
-#include <sys/param.h>
#include "init.h"
+#include "kern_constants.h"
#include "os.h"
#include "user.h"
-#include "mode.h"
#define UML_DIR "~/.uml/"
#define UMID_LEN 64
/* Changed by set_umid, which is run early in boot */
-char umid[UMID_LEN] = { 0 };
+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;
char dir[512] = { '\0' };
int len, err;
- if(*uml_dir == '~'){
+ if (*uml_dir == '~') {
char *home = getenv("HOME");
err = -ENOENT;
- if(home == NULL){
- printk("make_uml_dir : no value in environment for "
- "$HOME\n");
+ if (home == NULL) {
+ printk(UM_KERN_ERR "make_uml_dir : no value in "
+ "environment for $HOME\n");
goto err;
}
strlcpy(dir, home, sizeof(dir));
}
strcpy(uml_dir, dir);
- if((mkdir(uml_dir, 0777) < 0) && (errno != EEXIST)){
+ if ((mkdir(uml_dir, 0777) < 0) && (errno != EEXIST)) {
printf("Failed to mkdir '%s': %s\n", uml_dir, strerror(errno));
err = -errno;
goto err_free;
return err;
}
-static int actually_do_remove(char *dir)
+/*
+ * Unlinks the files contained in @dir and then removes @dir.
+ * Doesn't handle directory trees, so it's not like rm -rf, but almost such. We
+ * ignore ENOENT errors for anything (they happen, strangely enough - possibly
+ * due to races between multiple dying UML threads).
+ */
+static int remove_files_and_dir(char *dir)
{
DIR *directory;
struct dirent *ent;
int len;
char file[256];
+ int ret;
directory = opendir(dir);
- if(directory == NULL)
- return -errno;
+ if (directory == NULL) {
+ if (errno != ENOENT)
+ return -errno;
+ else
+ return 0;
+ }
- while((ent = readdir(directory)) != NULL){
- if(!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, ".."))
+ 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))
- return -E2BIG;
+ if (len > sizeof(file)) {
+ ret = -E2BIG;
+ goto out;
+ }
sprintf(file, "%s/%s", dir, ent->d_name);
- if(unlink(file) < 0)
- return -errno;
+ if (unlink(file) < 0 && errno != ENOENT) {
+ ret = -errno;
+ goto out;
+ }
}
- if(rmdir(dir) < 0)
- return -errno;
- return 0;
+ if (rmdir(dir) < 0 && errno != ENOENT) {
+ ret = -errno;
+ goto out;
+ }
+
+ ret = 0;
+out:
+ closedir(directory);
+ return ret;
}
-/* This says that there isn't already a user of the specified directory even if
+/*
+ * This says that there isn't already a user of the specified directory even if
* there are errors during the checking. This is because if these errors
* happen, the directory is unusable by the pre-existing UML, so we might as
* well take it over. This could happen either by
int dead, fd, p, n, err;
n = snprintf(file, sizeof(file), "%s/pid", dir);
- if(n >= sizeof(file)){
- printk("is_umdir_used - pid filename too long\n");
+ if (n >= sizeof(file)) {
+ printk(UM_KERN_ERR "is_umdir_used - pid filename too long\n");
err = -E2BIG;
goto out;
}
dead = 0;
fd = open(file, O_RDONLY);
- if(fd < 0) {
+ if (fd < 0) {
fd = -errno;
- if(fd != -ENOENT){
- printk("is_umdir_used : couldn't open pid file '%s', "
- "err = %d\n", file, -fd);
+ if (fd != -ENOENT) {
+ printk(UM_KERN_ERR "is_umdir_used : couldn't open pid "
+ "file '%s', err = %d\n", file, -fd);
}
goto out;
}
err = 0;
n = read(fd, pid, sizeof(pid));
- if(n < 0){
- printk("is_umdir_used : couldn't read pid file '%s', "
- "err = %d\n", file, errno);
+ if (n < 0) {
+ printk(UM_KERN_ERR "is_umdir_used : couldn't read pid file "
+ "'%s', err = %d\n", file, errno);
goto out_close;
- } else if(n == 0){
- printk("is_umdir_used : couldn't read pid file '%s', "
- "0-byte read\n", file);
+ } else if (n == 0) {
+ printk(UM_KERN_ERR "is_umdir_used : couldn't read pid file "
+ "'%s', 0-byte read\n", file);
goto out_close;
}
p = strtoul(pid, &end, 0);
- if(end == pid){
- printk("is_umdir_used : couldn't parse pid file '%s', "
- "errno = %d\n", file, errno);
+ if (end == pid) {
+ printk(UM_KERN_ERR "is_umdir_used : couldn't parse pid file "
+ "'%s', errno = %d\n", file, errno);
goto out_close;
}
- if((kill(p, 0) == 0) || (errno != ESRCH)){
- printk("umid \"%s\" is already in use by pid %d\n", umid, p);
+ if ((kill(p, 0) == 0) || (errno != ESRCH)) {
+ printk(UM_KERN_ERR "umid \"%s\" is already in use by pid %d\n",
+ umid, p);
return 1;
}
if (is_umdir_used(dir))
return -EEXIST;
- ret = actually_do_remove(dir);
+ ret = remove_files_and_dir(dir);
if (ret) {
- printk("is_umdir_used - actually_do_remove failed with "
- "err = %d\n", ret);
+ printk(UM_KERN_ERR "is_umdir_used - remove_files_and_dir "
+ "failed with err = %d\n", ret);
}
return ret;
}
char pid[sizeof("nnnnn\0")];
int fd, n;
- if(umid_file_name("pid", file, sizeof(file)))
+ if (umid_file_name("pid", file, sizeof(file)))
return;
fd = open(file, O_RDWR | O_CREAT | O_EXCL, 0644);
- if(fd < 0){
- printk("Open of machine pid file \"%s\" failed: %s\n",
- file, strerror(errno));
+ if (fd < 0) {
+ printk(UM_KERN_ERR "Open of machine pid file \"%s\" failed: "
+ "%s\n", file, strerror(errno));
return;
}
snprintf(pid, sizeof(pid), "%d\n", getpid());
n = write(fd, pid, strlen(pid));
- if(n != strlen(pid))
- printk("Write of pid file failed - err = %d\n", errno);
+ if (n != strlen(pid))
+ printk(UM_KERN_ERR "Write of pid file failed - err = %d\n",
+ errno);
close(fd);
}
int __init set_umid(char *name)
{
- if(strlen(name) > UMID_LEN - 1)
+ if (strlen(name) > UMID_LEN - 1)
return -E2BIG;
strlcpy(umid, name, sizeof(umid));
return 0;
}
+/* Changed in make_umid, which is called during early boot */
static int umid_setup = 0;
-int __init make_umid(void)
+static int __init make_umid(void)
{
int fd, err;
char tmp[256];
- if(umid_setup)
+ if (umid_setup)
return 0;
make_uml_dir();
- if(*umid == '\0'){
+ if (*umid == '\0') {
strlcpy(tmp, uml_dir, sizeof(tmp));
strlcat(tmp, "XXXXXX", sizeof(tmp));
fd = mkstemp(tmp);
- if(fd < 0){
- printk("make_umid - mkstemp(%s) failed: %s\n",
- tmp, strerror(errno));
+ if (fd < 0) {
+ printk(UM_KERN_ERR "make_umid - mkstemp(%s) failed: "
+ "%s\n", tmp, strerror(errno));
err = -errno;
goto err;
}
set_umid(&tmp[strlen(uml_dir)]);
- /* There's a nice tiny little race between this unlink and
+ /*
+ * 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.
*/
- if(unlink(tmp)){
+ if (unlink(tmp)) {
err = -errno;
goto err;
}
snprintf(tmp, sizeof(tmp), "%s%s", uml_dir, umid);
err = mkdir(tmp, 0777);
- if(err < 0){
+ if (err < 0) {
err = -errno;
- if(err != -EEXIST)
+ if (err != -EEXIST)
goto err;
if (umdir_take_if_dead(tmp) < 0)
err = mkdir(tmp, 0777);
}
- if(err){
+ if (err) {
err = -errno;
- printk("Failed to create '%s' - err = %d\n", umid, -errno);
+ printk(UM_KERN_ERR "Failed to create '%s' - err = %d\n", umid,
+ errno);
goto err;
}
static int __init make_umid_init(void)
{
- if(!make_umid())
+ if (!make_umid())
return 0;
- /* If initializing with the given umid failed, then try again with
+ /*
+ * If initializing with the given umid failed, then try again with
* a random one.
*/
- printk("Failed to initialize umid \"%s\", trying with a random umid\n",
- umid);
+ printk(UM_KERN_ERR "Failed to initialize umid \"%s\", trying with a "
+ "random umid\n", umid);
*umid = '\0';
make_umid();
int n, err;
err = make_umid();
- if(err)
+ if (err)
return err;
n = snprintf(buf, len, "%s%s/%s", uml_dir, umid, name);
- if(n >= len){
- printk("umid_file_name : buffer too short\n");
+ if (n >= len) {
+ printk(UM_KERN_ERR "umid_file_name : buffer too short\n");
return -E2BIG;
}
static int __init set_uml_dir(char *name, int *add)
{
- if(*name == '\0'){
+ if (*name == '\0') {
printf("uml_dir can't be an empty string\n");
return 0;
}
- if(name[strlen(name) - 1] == '/'){
+ if (name[strlen(name) - 1] == '/') {
uml_dir = name;
return 0;
}
uml_dir = malloc(strlen(name) + 2);
- if(uml_dir == NULL){
+ if (uml_dir == NULL) {
printf("Failed to malloc uml_dir - error = %d\n", errno);
- /* Return 0 here because do_initcalls doesn't look at
+ /*
+ * Return 0 here because do_initcalls doesn't look at
* the return value.
*/
return 0;
char dir[strlen(uml_dir) + UMID_LEN + 1], err;
sprintf(dir, "%s%s", uml_dir, umid);
- err = actually_do_remove(dir);
- if(err)
- printf("remove_umid_dir - actually_do_remove failed with "
+ err = remove_files_and_dir(dir);
+ if (err)
+ printf("remove_umid_dir - remove_files_and_dir failed with "
"err = %d\n", err);
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff