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Make read_user() non-blocking, and add select() call.

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This commit is contained in:
Michael Brown
2007-08-04 01:22:52 +01:00
parent 218651e125
commit 07f84566d5
3 changed files with 151 additions and 50 deletions
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54
src/include/gpxe/posix_io.h
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@@ -10,12 +10,66 @@
#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
*