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140 lines
3.7 KiB
C
140 lines
3.7 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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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#ifndef __OS_H__
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#define __OS_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 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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* 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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u64 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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#endif
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