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- #ifndef _GPXE_POSIX_IO_H
- #define _GPXE_POSIX_IO_H
-
- /** @file
- *
- * POSIX-like I/O
- *
- */
-
- #include <stdint.h>
- #include <gpxe/uaccess.h>
-
- /** Minimum file descriptor that will ever be allocated */
- #define POSIX_FD_MIN ( 1 )
-
- /** Maximum file descriptor that will ever be allocated */
- #define POSIX_FD_MAX ( 31 )
-
- /** File descriptor set as used for select() */
- typedef uint32_t fd_set;
-
- extern int open ( const char *uri_string );
- extern ssize_t read_user ( int fd, userptr_t buffer,
- off_t offset, size_t len );
- extern int select ( fd_set *readfds, int wait );
- extern ssize_t fsize ( int fd );
- extern int close ( int fd );
-
- /**
- * Zero a file descriptor set
- *
- * @v set File descriptor set
- */
- static inline __attribute__ (( always_inline )) void
- FD_ZERO ( fd_set *set ) {
- *set = 0;
- }
-
- /**
- * Set a bit within a file descriptor set
- *
- * @v fd File descriptor
- * @v set File descriptor set
- */
- static inline __attribute__ (( always_inline )) void
- FD_SET ( int fd, fd_set *set ) {
- *set |= ( 1 << fd );
- }
-
- /**
- * Clear a bit within a file descriptor set
- *
- * @v fd File descriptor
- * @v set File descriptor set
- */
- static inline __attribute__ (( always_inline )) void
- FD_CLR ( int fd, fd_set *set ) {
- *set &= ~( 1 << fd );
- }
-
- /**
- * Test a bit within a file descriptor set
- *
- * @v fd File descriptor
- * @v set File descriptor set
- * @ret is_set Corresponding bit is set
- */
- static inline __attribute__ (( always_inline )) int
- FD_ISSET ( int fd, fd_set *set ) {
- return ( *set & ( 1 << fd ) );
- }
-
- /**
- * Read data from file
- *
- * @v fd File descriptor
- * @v buf Data buffer
- * @v len Maximum length to read
- * @ret len Actual length read, or negative error number
- */
- static inline ssize_t read ( int fd, void *buf, size_t len ) {
- return read_user ( fd, virt_to_user ( buf ), 0, len );
- }
-
- #endif /* _GPXE_POSIX_IO_H */
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