347d06dec4
The function os_free() returns nothing. Its return type should be "void" rather than "void *". Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
249 lines
6.3 KiB
C
249 lines
6.3 KiB
C
/*
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* Operating System Interface
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*
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* This provides access to useful OS routines for the sandbox architecture.
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* They are kept in a separate file so we can include system headers.
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*
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* Copyright (c) 2011 The Chromium OS Authors.
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef __OS_H__
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#define __OS_H__
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#include <linux/types.h>
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struct sandbox_state;
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/**
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* Access to the OS read() system call
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*
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* \param fd File descriptor as returned by os_open()
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* \param buf Buffer to place data
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* \param count Number of bytes to read
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* \return number of bytes read, or -1 on error
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*/
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ssize_t os_read(int fd, void *buf, size_t count);
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/**
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* Access to the OS read() system call with non-blocking access
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*
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* \param fd File descriptor as returned by os_open()
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* \param buf Buffer to place data
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* \param count Number of bytes to read
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* \return number of bytes read, or -1 on error
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*/
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ssize_t os_read_no_block(int fd, void *buf, size_t count);
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/**
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* Access to the OS write() system call
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*
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* \param fd File descriptor as returned by os_open()
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* \param buf Buffer containing data to write
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* \param count Number of bytes to write
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* \return number of bytes written, or -1 on error
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*/
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ssize_t os_write(int fd, const void *buf, size_t count);
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/**
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* Access to the OS lseek() system call
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*
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* \param fd File descriptor as returned by os_open()
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* \param offset File offset (based on whence)
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* \param whence Position offset is relative to (see below)
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* \return new file offset
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*/
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off_t os_lseek(int fd, off_t offset, int whence);
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/* Defines for "whence" in os_lseek() */
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#define OS_SEEK_SET 0
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#define OS_SEEK_CUR 1
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#define OS_SEEK_END 2
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/**
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* Access to the OS open() system call
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*
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* \param pathname Pathname of file to open
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* \param flags Flags, like O_RDONLY, O_RDWR
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* \return file descriptor, or -1 on error
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*/
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int os_open(const char *pathname, int flags);
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#define OS_O_RDONLY 0
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#define OS_O_WRONLY 1
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#define OS_O_RDWR 2
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#define OS_O_MASK 3 /* Mask for read/write flags */
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#define OS_O_CREAT 0100
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/**
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* Access to the OS close() system call
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*
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* \param fd File descriptor to close
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* \return 0 on success, -1 on error
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*/
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int os_close(int fd);
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/**
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* Access to the OS exit() system call
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*
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* This exits with the supplied return code, which should be 0 to indicate
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* success.
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*
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* @param exit_code exit code for U-Boot
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*/
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void os_exit(int exit_code) __attribute__((noreturn));
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/**
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* Put tty into raw mode to mimic serial console better
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*/
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void os_tty_raw(int fd);
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/**
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* Acquires some memory from the underlying os.
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*
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* \param length Number of bytes to be allocated
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* \return Pointer to length bytes or NULL on error
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*/
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void *os_malloc(size_t length);
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/**
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* Free memory previous allocated with os_malloc()/os_realloc()
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*
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* This returns the memory to the OS.
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*
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* \param ptr Pointer to memory block to free
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*/
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void os_free(void *ptr);
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/**
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* Reallocate previously-allocated memory to increase/decrease space
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*
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* This works in a similar way to the C library realloc() function. If
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* length is 0, then ptr is freed. Otherwise the space used by ptr is
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* expanded or reduced depending on whether length is larger or smaller
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* than before.
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*
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* If ptr is NULL, then this is similar to calling os_malloc().
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*
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* This function may need to move the memory block to make room for any
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* extra space, in which case the new pointer is returned.
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*
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* \param ptr Pointer to memory block to reallocate
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* \param length New length for memory block
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* \return pointer to new memory block, or NULL on failure or if length
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* is 0.
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*/
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void *os_realloc(void *ptr, size_t length);
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/**
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* Access to the usleep function of the os
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*
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* \param usec Time to sleep in micro seconds
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*/
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void os_usleep(unsigned long usec);
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/**
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* Gets a monotonic increasing number of nano seconds from the OS
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*
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* \return A monotonic increasing time scaled in nano seconds
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*/
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uint64_t os_get_nsec(void);
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/**
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* Parse arguments and update sandbox state.
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*
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* @param state Sandbox state to update
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* @param argc Argument count
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* @param argv Argument vector
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* @return 0 if ok, and program should continue;
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* 1 if ok, but program should stop;
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* -1 on error: program should terminate.
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*/
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int os_parse_args(struct sandbox_state *state, int argc, char *argv[]);
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/*
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* Types of directory entry that we support. See also os_dirent_typename in
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* the C file.
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*/
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enum os_dirent_t {
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OS_FILET_REG, /* Regular file */
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OS_FILET_LNK, /* Symbolic link */
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OS_FILET_DIR, /* Directory */
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OS_FILET_UNKNOWN, /* Something else */
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OS_FILET_COUNT,
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};
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/** A directory entry node, containing information about a single dirent */
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struct os_dirent_node {
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struct os_dirent_node *next; /* Pointer to next node, or NULL */
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ulong size; /* Size of file in bytes */
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enum os_dirent_t type; /* Type of entry */
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char name[0]; /* Name of entry */
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};
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/**
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* Get a directionry listing
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*
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* This allocates and returns a linked list containing the directory listing.
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*
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* @param dirname Directory to examine
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* @param headp Returns pointer to head of linked list, or NULL if none
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* @return 0 if ok, -ve on error
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*/
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int os_dirent_ls(const char *dirname, struct os_dirent_node **headp);
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/**
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* Get the name of a directory entry type
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*
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* @param type Type to cehck
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* @return string containing the name of that type, or "???" if none/invalid
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*/
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const char *os_dirent_get_typename(enum os_dirent_t type);
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/**
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* Get the size of a file
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*
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* @param fname Filename to check
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* @return size of file, or -1 if an error ocurred
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*/
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ssize_t os_get_filesize(const char *fname);
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/**
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* Write a character to the controlling OS terminal
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*
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* This bypasses the U-Boot console support and writes directly to the OS
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* stdout file descriptor.
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*
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* @param ch Character to write
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*/
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void os_putc(int ch);
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/**
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* Write a string to the controlling OS terminal
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*
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* This bypasses the U-Boot console support and writes directly to the OS
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* stdout file descriptor.
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*
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* @param str String to write (note that \n is not appended)
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*/
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void os_puts(const char *str);
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/**
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* Write the sandbox RAM buffer to a existing file
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*
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* @param fname Filename to write memory to (simple binary format)
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* @return 0 if OK, -ve on error
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*/
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int os_write_ram_buf(const char *fname);
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/**
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* Read the sandbox RAM buffer from an existing file
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*
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* @param fname Filename containing memory (simple binary format)
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* @return 0 if OK, -ve on error
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*/
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int os_read_ram_buf(const char *fname);
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#endif
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