diff options
Diffstat (limited to 'arch/um/os-Linux/umid.c')
-rw-r--r-- | arch/um/os-Linux/umid.c | 136 |
1 files changed, 74 insertions, 62 deletions
diff --git a/arch/um/os-Linux/umid.c b/arch/um/os-Linux/umid.c index e36541e..106fa86 100644 --- a/arch/um/os-Linux/umid.c +++ b/arch/um/os-Linux/umid.c @@ -1,14 +1,19 @@ +/* + * 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" @@ -27,13 +32,13 @@ static int __init make_uml_dir(void) 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)); @@ -52,7 +57,7 @@ static int __init make_uml_dir(void) } 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; @@ -69,8 +74,8 @@ err: /* * 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). + * 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) { @@ -115,7 +120,8 @@ out: 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 @@ -133,44 +139,45 @@ static inline int is_umdir_used(char *dir) 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; } @@ -194,8 +201,8 @@ static int umdir_take_if_dead(char *dir) ret = remove_files_and_dir(dir); if (ret) { - printk("is_umdir_used - remove_files_and_dir 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; } @@ -206,27 +213,28 @@ static void __init create_pid_file(void) 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)); @@ -242,18 +250,18 @@ 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; } @@ -262,11 +270,12 @@ int __init make_umid(void) 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; } @@ -274,9 +283,9 @@ int __init make_umid(void) 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) @@ -284,9 +293,10 @@ int __init make_umid(void) 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; } @@ -301,14 +311,15 @@ int __init make_umid(void) 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(); @@ -322,12 +333,12 @@ int __init umid_file_name(char *name, char *buf, int len) 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; } @@ -341,21 +352,22 @@ char *get_umid(void) 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; @@ -376,7 +388,7 @@ static void remove_umid_dir(void) sprintf(dir, "%s%s", uml_dir, umid); err = remove_files_and_dir(dir); - if(err) + if (err) printf("remove_umid_dir - remove_files_and_dir failed with " "err = %d\n", err); } |