1 #ifndef _IPXE_POSIX_IO_H
2 #define _IPXE_POSIX_IO_H
3
4 /** @file
5 *
6 * POSIX-like I/O
7 *
8 */
9
10 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
11
12 #include <stdint.h>
13 #include <ipxe/uaccess.h>
14
15 /** Minimum file descriptor that will ever be allocated */
16 #define POSIX_FD_MIN ( 1 )
17
18 /** Maximum file descriptor that will ever be allocated */
19 #define POSIX_FD_MAX ( 31 )
20
21 /** File descriptor set as used for select() */
22 typedef uint32_t fd_set;
23
24 extern int open ( const char *uri_string );
25 extern ssize_t read_user ( int fd, userptr_t buffer,
26 off_t offset, size_t len );
27 extern int select ( fd_set *readfds, int wait );
28 extern ssize_t fsize ( int fd );
29 extern int close ( int fd );
30
31 /**
32 * Zero a file descriptor set
33 *
34 * @v set File descriptor set
35 */
36 static inline __attribute__ (( always_inline )) void
FD_ZERO(fd_set * set)37 FD_ZERO ( fd_set *set ) {
38 *set = 0;
39 }
40
41 /**
42 * Set a bit within a file descriptor set
43 *
44 * @v fd File descriptor
45 * @v set File descriptor set
46 */
47 static inline __attribute__ (( always_inline )) void
FD_SET(int fd,fd_set * set)48 FD_SET ( int fd, fd_set *set ) {
49 *set |= ( 1 << fd );
50 }
51
52 /**
53 * Clear a bit within a file descriptor set
54 *
55 * @v fd File descriptor
56 * @v set File descriptor set
57 */
58 static inline __attribute__ (( always_inline )) void
FD_CLR(int fd,fd_set * set)59 FD_CLR ( int fd, fd_set *set ) {
60 *set &= ~( 1 << fd );
61 }
62
63 /**
64 * Test a bit within a file descriptor set
65 *
66 * @v fd File descriptor
67 * @v set File descriptor set
68 * @ret is_set Corresponding bit is set
69 */
70 static inline __attribute__ (( always_inline )) int
FD_ISSET(int fd,fd_set * set)71 FD_ISSET ( int fd, fd_set *set ) {
72 return ( *set & ( 1 << fd ) );
73 }
74
75 /**
76 * Read data from file
77 *
78 * @v fd File descriptor
79 * @v buf Data buffer
80 * @v len Maximum length to read
81 * @ret len Actual length read, or negative error number
82 */
read(int fd,void * buf,size_t len)83 static inline ssize_t read ( int fd, void *buf, size_t len ) {
84 return read_user ( fd, virt_to_user ( buf ), 0, len );
85 }
86
87 #endif /* _IPXE_POSIX_IO_H */
88