os.h

底层驱动开发

/* 
 * Copyright (C) 2002 Jeff Dike ([e-mail])
 * Licensed under the GPL
 */

#ifndef __OS_H__
#define __OS_H__

#include "uml-config.h"
#include "asm/types.h"
#include "../os/include/file.h"

#define OS_TYPE_FILE 1 
#define OS_TYPE_DIR 2 
#define OS_TYPE_SYMLINK 3 
#define OS_TYPE_CHARDEV 4
#define OS_TYPE_BLOCKDEV 5
#define OS_TYPE_FIFO 6
#define OS_TYPE_SOCK 7

/* os_access() flags */
#define OS_ACC_F_OK    0       /* Test for existence.  */
#define OS_ACC_X_OK    1       /* Test for execute permission.  */
#define OS_ACC_W_OK    2       /* Test for write permission.  */
#define OS_ACC_R_OK    4       /* Test for read permission.  */
#define OS_ACC_RW_OK   (OS_ACC_W_OK | OS_ACC_R_OK) /* Test for RW permission */

/*
 * types taken from stat_file() in hostfs_user.c
 * (if they are wrong here, they are wrong there...).
 */
struct uml_stat {
	int                ust_dev;        /* device */
	unsigned long long ust_ino;        /* inode */
	int                ust_mode;       /* protection */
	int                ust_nlink;      /* number of hard links */
	int                ust_uid;        /* user ID of owner */
	int                ust_gid;        /* group ID of owner */
	unsigned long long ust_size;       /* total size, in bytes */
	int                ust_blksize;    /* blocksize for filesystem I/O */
	unsigned long long ust_blocks;     /* number of blocks allocated */
	unsigned long      ust_atime;      /* time of last access */
	unsigned long      ust_mtime;      /* time of last modification */
	unsigned long      ust_ctime;      /* time of last change */
};

struct openflags {
	unsigned int r : 1;
	unsigned int w : 1;
	unsigned int s : 1;	/* O_SYNC */
	unsigned int c : 1;	/* O_CREAT */
	unsigned int t : 1;	/* O_TRUNC */
	unsigned int a : 1;	/* O_APPEND */
	unsigned int e : 1;	/* O_EXCL */
	unsigned int cl : 1;    /* FD_CLOEXEC */
};

#define OPENFLAGS() ((struct openflags) { .r = 0, .w = 0, .s = 0, .c = 0, \
 					  .t = 0, .a = 0, .e = 0, .cl = 0 })

static inline struct openflags of_read(struct openflags flags)
{
	flags.r = 1; 
	return(flags);
}

static inline struct openflags of_write(struct openflags flags)
{
	flags.w = 1; 
	return(flags); 
}

static inline struct openflags of_rdwr(struct openflags flags)
{
	return(of_read(of_write(flags)));
}

static inline struct openflags of_set_rw(struct openflags flags, int r, int w)
{
	flags.r = r;
	flags.w = w;
	return(flags);
}

static inline struct openflags of_sync(struct openflags flags)
{ 
	flags.s = 1; 
	return(flags); 
}

static inline struct openflags of_create(struct openflags flags)
{ 
	flags.c = 1; 
	return(flags); 
}
 
static inline struct openflags of_trunc(struct openflags flags)
{ 
	flags.t = 1; 
	return(flags); 
}
 
static inline struct openflags of_append(struct openflags flags)
{ 
	flags.a = 1; 
	return(flags); 
}
 
static inline struct openflags of_excl(struct openflags flags)
{ 
	flags.e = 1; 
	return(flags); 
}

static inline struct openflags of_cloexec(struct openflags flags)
{ 
	flags.cl = 1; 
	return(flags); 
}
  
extern int os_stat_file(const char *file_name, struct uml_stat *buf);
extern int os_stat_fd(const int fd, struct uml_stat *buf);
extern int os_access(const char *file, int mode);
extern void os_print_error(int error, const char* str);
extern int os_get_exec_close(int fd, int *close_on_exec);
extern int os_set_exec_close(int fd, int close_on_exec);
extern int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg);
extern int os_window_size(int fd, int *rows, int *cols);
extern int os_new_tty_pgrp(int fd, int pid);
extern int os_get_ifname(int fd, char *namebuf);
extern int os_set_slip(int fd);
extern int os_set_owner(int fd, int pid);
extern int os_sigio_async(int master, int slave);
extern int os_mode_fd(int fd, int mode);

extern int os_seek_file(int fd, __u64 offset);
extern int os_open_file(char *file, struct openflags flags, int mode);
extern int os_read_file(int fd, void *buf, int len);
extern int os_write_file(int fd, const void *buf, int count);
extern int os_file_size(char *file, unsigned long long *size_out);
extern int os_file_modtime(char *file, unsigned long *modtime);
extern int os_pipe(int *fd, int stream, int close_on_exec);
extern int os_set_fd_async(int fd, int owner);
extern int os_clear_fd_async(int fd);
extern int os_set_fd_block(int fd, int blocking);
extern int os_accept_connection(int fd);
extern int os_create_unix_socket(char *file, int len, int close_on_exec);
extern int os_shutdown_socket(int fd, int r, int w);
extern void os_close_file(int fd);
extern int os_rcv_fd(int fd, int *helper_pid_out);
extern int create_unix_socket(char *file, int len, int close_on_exec);
extern int os_connect_socket(char *name);
extern int os_file_type(char *file);
extern int os_file_mode(char *file, struct openflags *mode_out);
extern int os_lock_file(int fd, int excl);

/* start_up.c */
extern void os_early_checks(void);
extern int can_do_skas(void);

/* Make sure they are clear when running in TT mode. Required by
 * SEGV_MAYBE_FIXABLE */
#ifdef UML_CONFIG_MODE_SKAS
#define clear_can_do_skas() do { ptrace_faultinfo = proc_mm = 0; } while (0)
#else
#define clear_can_do_skas() do {} while (0)
#endif

/* mem.c */
extern int create_mem_file(unsigned long len);

/* process.c */
extern unsigned long os_process_pc(int pid);
extern int os_process_parent(int pid);
extern void os_stop_process(int pid);
extern void os_kill_process(int pid, int reap_child);
extern void os_kill_ptraced_process(int pid, int reap_child);
extern void os_usr1_process(int pid);
extern int os_getpid(void);
extern int os_getpgrp(void);
extern void init_new_thread_stack(void *sig_stack, void (*usr1_handler)(int));
extern void init_new_thread_signals(int altstack);
extern int run_kernel_thread(int (*fn)(void *), void *arg, void **jmp_ptr);

extern int os_map_memory(void *virt, int fd, unsigned long long off,
			 unsigned long len, int r, int w, int x);
extern int os_protect_memory(void *addr, unsigned long len, 
			     int r, int w, int x);
extern int os_unmap_memory(void *addr, int len);
extern void os_flush_stdout(void);
extern unsigned long long os_usecs(void);

/* tt.c
 * for tt mode only (will be deleted in future...)
 */
extern int protect_memory(unsigned long addr, unsigned long len,
			  int r, int w, int x, int must_succeed);
extern void forward_pending_sigio(int target);
extern int start_fork_tramp(void *arg, unsigned long temp_stack,
			    int clone_flags, int (*tramp)(void *));

#endif

/*
 * 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:
 */