Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / ipxe / src / include / ipxe / posix_io.h

diff --git a/qemu/roms/ipxe/src/include/ipxe/posix_io.h b/qemu/roms/ipxe/src/include/ipxe/posix_io.h
new file mode 100644 (file)
index 0000000..11f3bb5
--- /dev/null
+++ b/qemu/roms/ipxe/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 */