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include/os.h
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/* |
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* 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. * |
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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__ #define __OS_H__ |
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#include <linux/types.h> |
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struct rtc_time; |
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struct sandbox_state; |
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/** * Access to the OS read() system call * * \param fd File descriptor as returned by os_open() * \param buf Buffer to place data * \param count Number of bytes to read * \return number of bytes read, or -1 on error */ ssize_t os_read(int fd, void *buf, size_t count); /** |
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* Access to the OS read() system call with non-blocking access * * \param fd File descriptor as returned by os_open() * \param buf Buffer to place data * \param count Number of bytes to read * \return number of bytes read, or -1 on error */ ssize_t os_read_no_block(int fd, void *buf, size_t count); /** |
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* Access to the OS write() system call * * \param fd File descriptor as returned by os_open() * \param buf Buffer containing data to write * \param count Number of bytes to write * \return number of bytes written, or -1 on error */ ssize_t os_write(int fd, const void *buf, size_t count); /** |
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* 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 /** |
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* Access to the OS open() system call * * \param pathname Pathname of file to open |
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* \param flags Flags, like OS_O_RDONLY, OS_O_RDWR |
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* \return file descriptor, or -1 on error */ int os_open(const char *pathname, int flags); |
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#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 |
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/** * Access to the OS close() system call * * \param fd File descriptor to close * \return 0 on success, -1 on error */ int os_close(int fd); /** |
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* Access to the OS unlink() system call * * \param pathname Path of file to delete * \return 0 for success, other for error */ int os_unlink(const char *pathname); /** |
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* Access to the OS exit() system call * * This exits with the supplied return code, which should be 0 to indicate * success. * * @param exit_code exit code for U-Boot */ |
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void os_exit(int exit_code) __attribute__((noreturn)); |
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/** * Put tty into raw mode to mimic serial console better |
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* * @param fd File descriptor of stdin (normally 0) * @param allow_sigs Allow Ctrl-C, Ctrl-Z to generate signals rather than * be handled by U-Boot |
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*/ |
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void os_tty_raw(int fd, bool allow_sigs); |
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/** |
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* Restore the tty to its original mode * * Call this to restore the original terminal mode, after it has been changed * by os_tty_raw(). This is an internal function. */ void os_fd_restore(void); /** |
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* 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); |
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/** |
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* Free memory previous allocated with os_malloc()/os_realloc() * * This returns the memory to the OS. * * \param ptr Pointer to memory block to free */ |
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void os_free(void *ptr); |
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/** * Reallocate previously-allocated memory to increase/decrease space * * This works in a similar way to the C library realloc() function. If * length is 0, then ptr is freed. Otherwise the space used by ptr is * expanded or reduced depending on whether length is larger or smaller * than before. * * If ptr is NULL, then this is similar to calling os_malloc(). * * This function may need to move the memory block to make room for any * extra space, in which case the new pointer is returned. * * \param ptr Pointer to memory block to reallocate * \param length New length for memory block * \return pointer to new memory block, or NULL on failure or if length * is 0. */ void *os_realloc(void *ptr, size_t length); /** |
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* 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 */ |
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uint64_t os_get_nsec(void); |
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/** * 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[]); |
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/* * Types of directory entry that we support. See also os_dirent_typename in * the C file. */ enum os_dirent_t { OS_FILET_REG, /* Regular file */ OS_FILET_LNK, /* Symbolic link */ OS_FILET_DIR, /* Directory */ OS_FILET_UNKNOWN, /* Something else */ OS_FILET_COUNT, }; /** A directory entry node, containing information about a single dirent */ struct os_dirent_node { struct os_dirent_node *next; /* Pointer to next node, or NULL */ ulong size; /* Size of file in bytes */ enum os_dirent_t type; /* Type of entry */ char name[0]; /* Name of entry */ }; /** * Get a directionry listing * * This allocates and returns a linked list containing the directory listing. * * @param dirname Directory to examine * @param headp Returns pointer to head of linked list, or NULL if none * @return 0 if ok, -ve on error */ int os_dirent_ls(const char *dirname, struct os_dirent_node **headp); /** |
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* Free directory list * * This frees a linked list containing a directory listing. * * @param node Pointer to head of linked list */ void os_dirent_free(struct os_dirent_node *node); /** |
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* Get the name of a directory entry type * |
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* @param type Type to check |
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* @return string containing the name of that type, or "???" if none/invalid */ const char *os_dirent_get_typename(enum os_dirent_t type); /** * Get the size of a file * * @param fname Filename to check |
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* @param size size of file is returned if no error * @return 0 on success or -1 if an error ocurred |
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*/ |
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int os_get_filesize(const char *fname, loff_t *size); |
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/** |
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* Write a character to the controlling OS terminal * * This bypasses the U-Boot console support and writes directly to the OS * stdout file descriptor. * * @param ch Character to write */ void os_putc(int ch); /** * Write a string to the controlling OS terminal * * This bypasses the U-Boot console support and writes directly to the OS * stdout file descriptor. * * @param str String to write (note that is not appended) */ void os_puts(const char *str); /** |
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* Write the sandbox RAM buffer to a existing file * * @param fname Filename to write memory to (simple binary format) * @return 0 if OK, -ve on error */ int os_write_ram_buf(const char *fname); /** * Read the sandbox RAM buffer from an existing file * * @param fname Filename containing memory (simple binary format) * @return 0 if OK, -ve on error */ int os_read_ram_buf(const char *fname); |
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/** * Jump to a new executable image * * This uses exec() to run a new executable image, after putting it in a * temporary file. The same arguments and environment are passed to this * new image, with the addition of: * * -j <filename> Specifies the filename the image was written to. The * calling image may want to delete this at some point. * -m <filename> Specifies the file containing the sandbox memory * (ram_buf) from this image, so that the new image can * have access to this. It also means that the original * memory filename passed to U-Boot will be left intact. * * @param dest Buffer containing executable image * @param size Size of buffer */ int os_jump_to_image(const void *dest, int size); |
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/** |
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* os_find_u_boot() - Determine the path to U-Boot proper * * This function is intended to be called from within sandbox SPL. It uses * a few heuristics to find U-Boot proper. Normally it is either in the same * directory, or the directory above (since u-boot-spl is normally in an * spl/ subdirectory when built). * * @fname: Place to put full path to U-Boot * @maxlen: Maximum size of @fname * @return 0 if OK, -NOSPC if the filename is too large, -ENOENT if not found */ int os_find_u_boot(char *fname, int maxlen); /** * os_spl_to_uboot() - Run U-Boot proper * * When called from SPL, this runs U-Boot proper. The filename is obtained by * calling os_find_u_boot(). * * @fname: Full pathname to U-Boot executable * @return 0 if OK, -ve on error */ int os_spl_to_uboot(const char *fname); /** |
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* Read the current system time * * This reads the current Local Time and places it into the provided * structure. * * @param rt Place to put system time */ void os_localtime(struct rtc_time *rt); |
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#endif |