/*
+ * Operating System Interface
+ *
+ * This provides access to useful OS routines for the sandbox architecture.
+ * They are kept in a separate file so we can include system headers.
+ *
* Copyright (c) 2011 The Chromium OS Authors.
* See file CREDITS for list of people who contributed to this
* project.
* MA 02111-1307 USA
*/
-/*
- * Operating System Interface
- *
- * This provides access to useful OS routines from the sandbox architecture
- */
+#ifndef __OS_H__
+#define __OS_H__
+
+struct sandbox_state;
/**
* Access to the OS read() system call
*/
ssize_t os_write(int fd, const void *buf, size_t count);
+/**
+ * Access to the OS lseek() system call
+ *
+ * \param fd File descriptor as returned by os_open()
+ * \param offset File offset (based on whence)
+ * \param whence Position offset is relative to (see below)
+ * \return new file offset
+ */
+off_t os_lseek(int fd, off_t offset, int whence);
+
+/* Defines for "whence" in os_lseek() */
+#define OS_SEEK_SET 0
+#define OS_SEEK_CUR 1
+#define OS_SEEK_END 2
+
/**
* Access to the OS open() system call
*
*/
int os_open(const char *pathname, int flags);
+#define OS_O_RDONLY 0
+#define OS_O_WRONLY 1
+#define OS_O_RDWR 2
+#define OS_O_MASK 3 /* Mask for read/write flags */
+#define OS_O_CREAT 0100
+
/**
* Access to the OS close() system call
*
*
* @param exit_code exit code for U-Boot
*/
-void os_exit(int exit_code);
+void os_exit(int exit_code) __attribute__((noreturn));
/**
* Put tty into raw mode to mimic serial console better
*/
void os_tty_raw(int fd);
+
+/**
+ * Acquires some memory from the underlying os.
+ *
+ * \param length Number of bytes to be allocated
+ * \return Pointer to length bytes or NULL on error
+ */
+void *os_malloc(size_t length);
+
+/**
+ * Access to the usleep function of the os
+ *
+ * \param usec Time to sleep in micro seconds
+ */
+void os_usleep(unsigned long usec);
+
+/**
+ * Gets a monotonic increasing number of nano seconds from the OS
+ *
+ * \return A monotonic increasing time scaled in nano seconds
+ */
+u64 os_get_nsec(void);
+
+/**
+ * Parse arguments and update sandbox state.
+ *
+ * @param state Sandbox state to update
+ * @param argc Argument count
+ * @param argv Argument vector
+ * @return 0 if ok, and program should continue;
+ * 1 if ok, but program should stop;
+ * -1 on error: program should terminate.
+ */
+int os_parse_args(struct sandbox_state *state, int argc, char *argv[]);
+
+#endif