1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
326 lines
7.3 KiB
C
326 lines
7.3 KiB
C
/*
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* Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <dirent.h>
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#include <signal.h>
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#include <sys/stat.h>
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#include <sys/param.h>
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#include "user.h"
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#include "umid.h"
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#include "init.h"
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#include "os.h"
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#include "user_util.h"
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#include "choose-mode.h"
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#define UMID_LEN 64
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#define UML_DIR "~/.uml/"
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/* Changed by set_umid and make_umid, which are run early in boot */
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static char umid[UMID_LEN] = { 0 };
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/* Changed by set_uml_dir and make_uml_dir, which are run early in boot */
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static char *uml_dir = UML_DIR;
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/* Changed by set_umid */
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static int umid_is_random = 1;
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static int umid_inited = 0;
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static int make_umid(int (*printer)(const char *fmt, ...));
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static int __init set_umid(char *name, int is_random,
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int (*printer)(const char *fmt, ...))
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{
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if(umid_inited){
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(*printer)("Unique machine name can't be set twice\n");
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return(-1);
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}
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if(strlen(name) > UMID_LEN - 1)
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(*printer)("Unique machine name is being truncated to %d "
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"characters\n", UMID_LEN);
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strlcpy(umid, name, sizeof(umid));
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umid_is_random = is_random;
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umid_inited = 1;
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return 0;
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}
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static int __init set_umid_arg(char *name, int *add)
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{
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*add = 0;
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return(set_umid(name, 0, printf));
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}
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__uml_setup("umid=", set_umid_arg,
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"umid=<name>\n"
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" This is used to assign a unique identity to this UML machine and\n"
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" is used for naming the pid file and management console socket.\n\n"
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);
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int __init umid_file_name(char *name, char *buf, int len)
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{
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int n;
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if(!umid_inited && make_umid(printk)) return(-1);
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n = strlen(uml_dir) + strlen(umid) + strlen(name) + 1;
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if(n > len){
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printk("umid_file_name : buffer too short\n");
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return(-1);
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}
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sprintf(buf, "%s%s/%s", uml_dir, umid, name);
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return(0);
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}
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extern int tracing_pid;
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static int __init create_pid_file(void)
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{
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char file[strlen(uml_dir) + UMID_LEN + sizeof("/pid\0")];
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char pid[sizeof("nnnnn\0")];
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int fd, n;
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if(umid_file_name("pid", file, sizeof(file))) return 0;
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fd = os_open_file(file, of_create(of_excl(of_rdwr(OPENFLAGS()))),
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0644);
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if(fd < 0){
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printf("Open of machine pid file \"%s\" failed: %s\n",
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file, strerror(-fd));
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return 0;
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}
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sprintf(pid, "%d\n", os_getpid());
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n = os_write_file(fd, pid, strlen(pid));
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if(n != strlen(pid))
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printf("Write of pid file failed - err = %d\n", -n);
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os_close_file(fd);
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return 0;
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}
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static int actually_do_remove(char *dir)
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{
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DIR *directory;
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struct dirent *ent;
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int len;
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char file[256];
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directory = opendir(dir);
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if(directory == NULL){
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printk("actually_do_remove : couldn't open directory '%s', "
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"errno = %d\n", dir, errno);
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return(1);
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}
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while((ent = readdir(directory)) != NULL){
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if(!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, ".."))
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continue;
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len = strlen(dir) + sizeof("/") + strlen(ent->d_name) + 1;
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if(len > sizeof(file)){
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printk("Not deleting '%s' from '%s' - name too long\n",
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ent->d_name, dir);
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continue;
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}
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sprintf(file, "%s/%s", dir, ent->d_name);
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if(unlink(file) < 0){
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printk("actually_do_remove : couldn't remove '%s' "
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"from '%s', errno = %d\n", ent->d_name, dir,
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errno);
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return(1);
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}
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}
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if(rmdir(dir) < 0){
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printk("actually_do_remove : couldn't rmdir '%s', "
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"errno = %d\n", dir, errno);
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return(1);
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}
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return(0);
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}
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void remove_umid_dir(void)
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{
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char dir[strlen(uml_dir) + UMID_LEN + 1];
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if(!umid_inited) return;
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sprintf(dir, "%s%s", uml_dir, umid);
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actually_do_remove(dir);
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}
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char *get_umid(int only_if_set)
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{
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if(only_if_set && umid_is_random) return(NULL);
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return(umid);
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}
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int not_dead_yet(char *dir)
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{
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char file[strlen(uml_dir) + UMID_LEN + sizeof("/pid\0")];
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char pid[sizeof("nnnnn\0")], *end;
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int dead, fd, p, n;
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sprintf(file, "%s/pid", dir);
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dead = 0;
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fd = os_open_file(file, of_read(OPENFLAGS()), 0);
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if(fd < 0){
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if(fd != -ENOENT){
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printk("not_dead_yet : couldn't open pid file '%s', "
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"err = %d\n", file, -fd);
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return(1);
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}
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dead = 1;
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}
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if(fd > 0){
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n = os_read_file(fd, pid, sizeof(pid));
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if(n < 0){
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printk("not_dead_yet : couldn't read pid file '%s', "
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"err = %d\n", file, -n);
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return(1);
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}
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p = strtoul(pid, &end, 0);
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if(end == pid){
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printk("not_dead_yet : couldn't parse pid file '%s', "
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"errno = %d\n", file, errno);
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dead = 1;
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}
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if(((kill(p, 0) < 0) && (errno == ESRCH)) ||
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(p == CHOOSE_MODE(tracing_pid, os_getpid())))
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dead = 1;
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}
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if(!dead) return(1);
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return(actually_do_remove(dir));
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}
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static int __init set_uml_dir(char *name, int *add)
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{
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if((strlen(name) > 0) && (name[strlen(name) - 1] != '/')){
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uml_dir = malloc(strlen(name) + 2);
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if(uml_dir == NULL){
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printf("Failed to malloc uml_dir - error = %d\n",
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errno);
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uml_dir = name;
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/* Return 0 here because do_initcalls doesn't look at
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* the return value.
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*/
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return(0);
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}
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sprintf(uml_dir, "%s/", name);
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}
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else uml_dir = name;
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return(0);
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}
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static int __init make_uml_dir(void)
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{
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char dir[MAXPATHLEN + 1] = { '\0' };
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int len;
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if(*uml_dir == '~'){
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char *home = getenv("HOME");
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if(home == NULL){
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printf("make_uml_dir : no value in environment for "
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"$HOME\n");
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exit(1);
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}
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strlcpy(dir, home, sizeof(dir));
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uml_dir++;
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}
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len = strlen(dir);
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strncat(dir, uml_dir, sizeof(dir) - len);
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len = strlen(dir);
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if((len > 0) && (len < sizeof(dir) - 1) && (dir[len - 1] != '/')){
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dir[len] = '/';
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dir[len + 1] = '\0';
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}
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uml_dir = malloc(strlen(dir) + 1);
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if(uml_dir == NULL){
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printf("make_uml_dir : malloc failed, errno = %d\n", errno);
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exit(1);
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}
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strcpy(uml_dir, dir);
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if((mkdir(uml_dir, 0777) < 0) && (errno != EEXIST)){
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printf("Failed to mkdir %s: %s\n", uml_dir, strerror(errno));
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return(-1);
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}
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return 0;
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}
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static int __init make_umid(int (*printer)(const char *fmt, ...))
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{
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int fd, err;
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char tmp[strlen(uml_dir) + UMID_LEN + 1];
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strlcpy(tmp, uml_dir, sizeof(tmp));
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if(!umid_inited){
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strcat(tmp, "XXXXXX");
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fd = mkstemp(tmp);
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if(fd < 0){
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(*printer)("make_umid - mkstemp(%s) failed: %s\n",
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tmp,strerror(errno));
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return(1);
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}
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os_close_file(fd);
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/* There's a nice tiny little race between this unlink and
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* the mkdir below. It'd be nice if there were a mkstemp
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* for directories.
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*/
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unlink(tmp);
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set_umid(&tmp[strlen(uml_dir)], 1, printer);
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}
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sprintf(tmp, "%s%s", uml_dir, umid);
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err = mkdir(tmp, 0777);
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if(err < 0){
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if(errno == EEXIST){
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if(not_dead_yet(tmp)){
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(*printer)("umid '%s' is in use\n", umid);
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return(-1);
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}
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err = mkdir(tmp, 0777);
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}
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}
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if(err < 0){
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(*printer)("Failed to create %s - errno = %d\n", umid, errno);
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return(-1);
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}
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return(0);
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}
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__uml_setup("uml_dir=", set_uml_dir,
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"uml_dir=<directory>\n"
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" The location to place the pid and umid files.\n\n"
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);
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static int __init make_umid_setup(void)
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{
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/* one function with the ordering we need ... */
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make_uml_dir();
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make_umid(printf);
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return create_pid_file();
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}
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__uml_postsetup(make_umid_setup);
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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