os_internal.c File Reference

wpa_supplicant/hostapd / Internal implementation of OS specific functions More...

#include "includes.h"
#include "os.h"

Include dependency graph for os_internal.c:

Go to the source code of this file.

Functions
void	os_sleep (os_time_t sec, os_time_t usec)
	Sleep (sec, usec).
int	os_get_time (struct os_time *t)
	Get current time (sec, usec).
int	os_mktime (int year, int month, int day, int hour, int min, int sec, os_time_t *t)
	Convert broken-down time into seconds since 1970-01-01.
int	os_daemonize (const char *pid_file)
	Run in the background (detach from the controlling terminal).
void	os_daemonize_terminate (const char *pid_file)
	Stop running in the background (remove pid file).
int	os_get_random (unsigned char *buf, size_t len)
	Get cryptographically strong pseudo random data.
unsigned long	os_random (void)
	Get pseudo random value (not necessarily very strong).
char *	os_rel2abs_path (const char *rel_path)
	Get an absolute path for a file.
int	os_program_init (void)
	Program initialization (called at start).
void	os_program_deinit (void)
	Program deinitialization (called just before exit).
int	os_setenv (const char *name, const char *value, int overwrite)
	Set environment variable.
int	os_unsetenv (const char *name)
	Delete environent variable.
char *	os_readfile (const char *name, size_t *len)
	Read a file to an allocated memory buffer.
void *	os_zalloc (size_t size)
	Allocate and zero memory.
void *	os_malloc (size_t size)
void *	os_realloc (void *ptr, size_t size)
void	os_free (void *ptr)
void *	os_memcpy (void *dest, const void *src, size_t n)
void *	os_memmove (void *dest, const void *src, size_t n)
void *	os_memset (void *s, int c, size_t n)
int	os_memcmp (const void *s1, const void *s2, size_t n)
char *	os_strdup (const char *s)
size_t	os_strlen (const char *s)
int	os_strcasecmp (const char *s1, const char *s2)
int	os_strncasecmp (const char *s1, const char *s2, size_t n)
char *	os_strchr (const char *s, int c)
char *	os_strrchr (const char *s, int c)
int	os_strcmp (const char *s1, const char *s2)
int	os_strncmp (const char *s1, const char *s2, size_t n)
char *	os_strncpy (char *dest, const char *src, size_t n)
char *	os_strstr (const char *haystack, const char *needle)
int	os_snprintf (char *str, size_t size, const char *format,...)

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Detailed Description

wpa_supplicant/hostapd / Internal implementation of OS specific functions

Copyright

Copyright (c) 2005-2006, Jouni Malinen <[email protected]>

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation.

Alternatively, this software may be distributed under the terms of BSD license.

See README and COPYING for more details.

This file is an example of operating system specific wrapper functions. This version implements many of the functions internally, so it can be used to fill in missing functions from the target system C libraries.

Some of the functions are using standard C library calls in order to keep this file in working condition to allow the functions to be tested on a Linux target. Please note that OS_NO_C_LIB_DEFINES needs to be defined for this file to work correctly. Note that these implementations are only examples and are not optimized for speed.

Definition in file os_internal.c.

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Function Documentation

int os_daemonize (  const char *  pid_file  )

Run in the background (detach from the controlling terminal). Parameters: pid_file  File name to write the process ID to or NULL to skip this Returns: 0 on success, -1 on failure Definition at line 74 of file os_internal.c.

void os_daemonize_terminate (  const char *  pid_file  )

Stop running in the background (remove pid file). Parameters: pid_file  File name to write the process ID to or NULL to skip this Definition at line 93 of file os_internal.c.

int os_get_random (  unsigned char *  buf, size_t  len )

Get cryptographically strong pseudo random data. Parameters: buf  Buffer for pseudo random data len  Length of the buffer Returns: 0 on success, -1 on failure Definition at line 100 of file os_internal.c.

int os_get_time (  struct os_time *  t  )

Get current time (sec, usec). Parameters: t  Pointer to buffer for the time Returns: 0 on success, -1 on failure Definition at line 40 of file os_internal.c.

int os_mktime (  int  year, int  month, int  day, int  hour, int  min, int  sec, os_time_t *  t )

Convert broken-down time into seconds since 1970-01-01. Parameters: year  Four digit year month  Month (1 .. 12) day  Day of month (1 .. 31) hour  Hour (0 .. 23) min  Minute (0 .. 59) sec  Second (0 .. 60) t  Buffer for returning calendar time representation (seconds since 1970-01-01 00:00:00) Returns: 0 on success, -1 on failure Definition at line 51 of file os_internal.c.

void os_program_deinit (  void   )

Program deinitialization (called just before exit). This function is called just before a program exists. If there are any OS specific processing, e.g., freeing resourced allocated in os_program_init(), it should be done here. It is also acceptable for this function to do nothing. Definition at line 169 of file os_internal.c.

int os_program_init (  void   )

Program initialization (called at start). Returns: 0 on success, -1 on failure This function is called when a programs starts. If there are any OS specific processing that is needed, it can be placed here. It is also acceptable to just return 0 if not special processing is needed. Definition at line 163 of file os_internal.c.

unsigned long os_random (  void   )

Get pseudo random value (not necessarily very strong). Returns: Pseudo random value Definition at line 118 of file os_internal.c.

char* os_readfile (  const char *  name, size_t *  len )

Read a file to an allocated memory buffer. Parameters: name  Name of the file to read len  For returning the length of the allocated buffer Returns: Pointer to the allocated buffer or NULL on failure This function allocates memory and reads the given file to this buffer. Both binary and text files can be read with this function. The caller is responsible for freeing the returned buffer with os_free(). Definition at line 191 of file os_internal.c.

char* os_rel2abs_path (  const char *  rel_path  )

Get an absolute path for a file. Parameters: rel_path  Relative path to a file Returns: Absolute path for the file or NULL on failure This function tries to convert a relative path of a file to an absolute path in order for the file to be found even if current working directory has changed. The returned value is allocated and caller is responsible for freeing it. It is acceptable to just return the same path in an allocated buffer, e.g., return strdup(rel_path). This function is only used to find configuration files when os_daemonize() may have changed the current working directory and relative path would be pointing to a different location. Definition at line 124 of file os_internal.c.

int os_setenv (  const char *  name, const char *  value, int  overwrite )

Set environment variable. Parameters: name  Name of the variable value  Value to set to the variable overwrite  Whether existing variable should be overwritten Returns: 0 on success, -1 on error This function is only used for wpa_cli action scripts. OS wrapper does not need to implement this if such functionality is not needed. Definition at line 174 of file os_internal.c.

void os_sleep (  os_time_t  sec, os_time_t  usec )

Sleep (sec, usec). Parameters: sec  Number of seconds to sleep usec  Number of microseconds to sleep Definition at line 31 of file os_internal.c.

int os_unsetenv (  const char *  name  )

Delete environent variable. Parameters: name  Name of the variable Returns: 0 on success, -1 on error This function is only used for wpa_cli action scripts. OS wrapper does not need to implement this if such functionality is not needed. Definition at line 180 of file os_internal.c.

void* os_zalloc (  size_t  size  )

Allocate and zero memory. Parameters: size  Number of bytes to allocate Returns: Pointer to allocated and zeroed memory or NULL on failure Caller is responsible for freeing the returned buffer with os_free(). Definition at line 217 of file os_internal.c.

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