7eebe8a9c5
This patch cleans up the umid code: - The only_if_set argument to get_umid is gone. - get_umid returns an empty string rather than NULL if there is no umid. - umid_is_random is gone since its users went away. - Some printfs were turned into printks because the code runs late enough that printk is working. - Error paths were cleaned up. - Some functions now return an error and let the caller print the error message rather than printing it themselves. This eliminates the practice of passing a pointer to printf or printk in, depending on where in the boot process we are. - Major tidying of not_dead_yet - mostly error path cleanup, plus a comment explaining why it doesn't react to errors the way you might expect. - Calls to os_* interfaces that were moved under os are changed back to their native libc forms. - snprintf, strlcpy, and their bounds-checking friends are used more often, replacing by-hand bounds checking in some places. Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
222 lines
7 KiB
C
222 lines
7 KiB
C
/*
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* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#ifndef __OS_H__
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#define __OS_H__
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#include "uml-config.h"
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#include "asm/types.h"
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#include "../os/include/file.h"
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#define OS_TYPE_FILE 1
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#define OS_TYPE_DIR 2
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#define OS_TYPE_SYMLINK 3
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#define OS_TYPE_CHARDEV 4
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#define OS_TYPE_BLOCKDEV 5
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#define OS_TYPE_FIFO 6
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#define OS_TYPE_SOCK 7
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/* os_access() flags */
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#define OS_ACC_F_OK 0 /* Test for existence. */
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#define OS_ACC_X_OK 1 /* Test for execute permission. */
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#define OS_ACC_W_OK 2 /* Test for write permission. */
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#define OS_ACC_R_OK 4 /* Test for read permission. */
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#define OS_ACC_RW_OK (OS_ACC_W_OK | OS_ACC_R_OK) /* Test for RW permission */
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/*
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* types taken from stat_file() in hostfs_user.c
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* (if they are wrong here, they are wrong there...).
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*/
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struct uml_stat {
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int ust_dev; /* device */
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unsigned long long ust_ino; /* inode */
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int ust_mode; /* protection */
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int ust_nlink; /* number of hard links */
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int ust_uid; /* user ID of owner */
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int ust_gid; /* group ID of owner */
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unsigned long long ust_size; /* total size, in bytes */
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int ust_blksize; /* blocksize for filesystem I/O */
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unsigned long long ust_blocks; /* number of blocks allocated */
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unsigned long ust_atime; /* time of last access */
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unsigned long ust_mtime; /* time of last modification */
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unsigned long ust_ctime; /* time of last change */
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};
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struct openflags {
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unsigned int r : 1;
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unsigned int w : 1;
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unsigned int s : 1; /* O_SYNC */
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unsigned int c : 1; /* O_CREAT */
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unsigned int t : 1; /* O_TRUNC */
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unsigned int a : 1; /* O_APPEND */
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unsigned int e : 1; /* O_EXCL */
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unsigned int cl : 1; /* FD_CLOEXEC */
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};
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#define OPENFLAGS() ((struct openflags) { .r = 0, .w = 0, .s = 0, .c = 0, \
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.t = 0, .a = 0, .e = 0, .cl = 0 })
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static inline struct openflags of_read(struct openflags flags)
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{
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flags.r = 1;
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return(flags);
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}
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static inline struct openflags of_write(struct openflags flags)
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{
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flags.w = 1;
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return(flags);
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}
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static inline struct openflags of_rdwr(struct openflags flags)
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{
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return(of_read(of_write(flags)));
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}
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static inline struct openflags of_set_rw(struct openflags flags, int r, int w)
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{
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flags.r = r;
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flags.w = w;
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return(flags);
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}
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static inline struct openflags of_sync(struct openflags flags)
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{
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flags.s = 1;
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return(flags);
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}
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static inline struct openflags of_create(struct openflags flags)
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{
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flags.c = 1;
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return(flags);
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}
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static inline struct openflags of_trunc(struct openflags flags)
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{
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flags.t = 1;
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return(flags);
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}
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static inline struct openflags of_append(struct openflags flags)
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{
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flags.a = 1;
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return(flags);
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}
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static inline struct openflags of_excl(struct openflags flags)
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{
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flags.e = 1;
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return(flags);
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}
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static inline struct openflags of_cloexec(struct openflags flags)
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{
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flags.cl = 1;
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return(flags);
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}
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extern int os_stat_file(const char *file_name, struct uml_stat *buf);
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extern int os_stat_fd(const int fd, struct uml_stat *buf);
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extern int os_access(const char *file, int mode);
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extern void os_print_error(int error, const char* str);
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extern int os_get_exec_close(int fd, int *close_on_exec);
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extern int os_set_exec_close(int fd, int close_on_exec);
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extern int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg);
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extern int os_window_size(int fd, int *rows, int *cols);
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extern int os_new_tty_pgrp(int fd, int pid);
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extern int os_get_ifname(int fd, char *namebuf);
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extern int os_set_slip(int fd);
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extern int os_set_owner(int fd, int pid);
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extern int os_sigio_async(int master, int slave);
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extern int os_mode_fd(int fd, int mode);
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extern int os_seek_file(int fd, __u64 offset);
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extern int os_open_file(char *file, struct openflags flags, int mode);
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extern int os_read_file(int fd, void *buf, int len);
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extern int os_write_file(int fd, const void *buf, int count);
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extern int os_file_size(char *file, unsigned long long *size_out);
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extern int os_file_modtime(char *file, unsigned long *modtime);
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extern int os_pipe(int *fd, int stream, int close_on_exec);
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extern int os_set_fd_async(int fd, int owner);
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extern int os_clear_fd_async(int fd);
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extern int os_set_fd_block(int fd, int blocking);
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extern int os_accept_connection(int fd);
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extern int os_create_unix_socket(char *file, int len, int close_on_exec);
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extern int os_shutdown_socket(int fd, int r, int w);
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extern void os_close_file(int fd);
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extern int os_rcv_fd(int fd, int *helper_pid_out);
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extern int create_unix_socket(char *file, int len, int close_on_exec);
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extern int os_connect_socket(char *name);
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extern int os_file_type(char *file);
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extern int os_file_mode(char *file, struct openflags *mode_out);
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extern int os_lock_file(int fd, int excl);
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/* start_up.c */
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extern void os_early_checks(void);
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extern int can_do_skas(void);
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/* Make sure they are clear when running in TT mode. Required by
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* SEGV_MAYBE_FIXABLE */
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#ifdef UML_CONFIG_MODE_SKAS
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#define clear_can_do_skas() do { ptrace_faultinfo = proc_mm = 0; } while (0)
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#else
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#define clear_can_do_skas() do {} while (0)
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#endif
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/* mem.c */
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extern int create_mem_file(unsigned long long len);
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/* process.c */
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extern unsigned long os_process_pc(int pid);
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extern int os_process_parent(int pid);
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extern void os_stop_process(int pid);
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extern void os_kill_process(int pid, int reap_child);
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extern void os_kill_ptraced_process(int pid, int reap_child);
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extern void os_usr1_process(int pid);
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extern int os_getpid(void);
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extern int os_getpgrp(void);
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extern void init_new_thread_stack(void *sig_stack, void (*usr1_handler)(int));
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extern void init_new_thread_signals(int altstack);
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extern int run_kernel_thread(int (*fn)(void *), void *arg, void **jmp_ptr);
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extern int os_map_memory(void *virt, int fd, unsigned long long off,
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unsigned long len, int r, int w, int x);
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extern int os_protect_memory(void *addr, unsigned long len,
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int r, int w, int x);
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extern int os_unmap_memory(void *addr, int len);
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extern void os_flush_stdout(void);
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extern unsigned long long os_usecs(void);
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/* tt.c
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* for tt mode only (will be deleted in future...)
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*/
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extern int protect_memory(unsigned long addr, unsigned long len,
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int r, int w, int x, int must_succeed);
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extern void forward_pending_sigio(int target);
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extern int start_fork_tramp(void *arg, unsigned long temp_stack,
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int clone_flags, int (*tramp)(void *));
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/* uaccess.c */
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extern unsigned long __do_user_copy(void *to, const void *from, int n,
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void **fault_addr, void **fault_catcher,
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void (*op)(void *to, const void *from,
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int n), int *faulted_out);
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/* helper.c */
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extern int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv,
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unsigned long *stack_out);
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extern int run_helper_thread(int (*proc)(void *), void *arg,
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unsigned int flags, unsigned long *stack_out,
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int stack_order);
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extern int helper_wait(int pid);
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/* umid.c */
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extern int umid_file_name(char *name, char *buf, int len);
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extern int set_umid(char *name);
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extern char *get_umid(void);
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#endif
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