1 /*
2 * Wrapper functions for accessing the file_struct fd array.
3 */
4
5 #ifndef __LINUX_FILE_H
6 #define __LINUX_FILE_H
7
8 extern void FASTCALL(fput(struct file *));
9 extern struct file * FASTCALL(fget(unsigned int fd));
10
get_close_on_exec(unsigned int fd)11 static inline int get_close_on_exec(unsigned int fd)
12 {
13 struct files_struct *files = current->files;
14 int res;
15 read_lock(&files->file_lock);
16 res = FD_ISSET(fd, files->close_on_exec);
17 read_unlock(&files->file_lock);
18 return res;
19 }
20
set_close_on_exec(unsigned int fd,int flag)21 static inline void set_close_on_exec(unsigned int fd, int flag)
22 {
23 struct files_struct *files = current->files;
24 write_lock(&files->file_lock);
25 if (flag)
26 FD_SET(fd, files->close_on_exec);
27 else
28 FD_CLR(fd, files->close_on_exec);
29 write_unlock(&files->file_lock);
30 }
31
fcheck_files(struct files_struct * files,unsigned int fd)32 static inline struct file * fcheck_files(struct files_struct *files, unsigned int fd)
33 {
34 struct file * file = NULL;
35
36 if (fd < files->max_fds)
37 file = files->fd[fd];
38 return file;
39 }
40
41 /*
42 * Check whether the specified fd has an open file.
43 */
fcheck(unsigned int fd)44 static inline struct file * fcheck(unsigned int fd)
45 {
46 struct file * file = NULL;
47 struct files_struct *files = current->files;
48
49 if (fd < files->max_fds)
50 file = files->fd[fd];
51 return file;
52 }
53
54 extern void put_filp(struct file *);
55
56 extern int get_unused_fd(void);
57
__put_unused_fd(struct files_struct * files,unsigned int fd)58 static inline void __put_unused_fd(struct files_struct *files, unsigned int fd)
59 {
60 FD_CLR(fd, files->open_fds);
61 if (fd < files->next_fd)
62 files->next_fd = fd;
63 }
64
put_unused_fd(unsigned int fd)65 static inline void put_unused_fd(unsigned int fd)
66 {
67 struct files_struct *files = current->files;
68
69 write_lock(&files->file_lock);
70 __put_unused_fd(files, fd);
71 write_unlock(&files->file_lock);
72 }
73
74 void fd_install(unsigned int fd, struct file * file);
75 void put_files_struct(struct files_struct *fs);
76
77 #endif /* __LINUX_FILE_H */
78