diff options
Diffstat (limited to 'src/include/ipxe/posix_io.h')
-rw-r--r-- | src/include/ipxe/posix_io.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/src/include/ipxe/posix_io.h b/src/include/ipxe/posix_io.h new file mode 100644 index 000000000..11f3bb5c9 --- /dev/null +++ b/src/include/ipxe/posix_io.h @@ -0,0 +1,87 @@ +#ifndef _IPXE_POSIX_IO_H +#define _IPXE_POSIX_IO_H + +/** @file + * + * POSIX-like I/O + * + */ + +FILE_LICENCE ( GPL2_OR_LATER ); + +#include <stdint.h> +#include <ipxe/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 /* _IPXE_POSIX_IO_H */ |