os_unix.c File Reference

wpa_supplicant/hostapd / OS specific functions for UNIX/POSIX systems More...

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

Include dependency graph for os_unix.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.

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Detailed Description

wpa_supplicant/hostapd / OS specific functions for UNIX/POSIX systems

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.

Definition in file os_unix.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 63 of file os_unix.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 82 of file os_unix.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 89 of file os_unix.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 29 of file os_unix.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 40 of file os_unix.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 162 of file os_unix.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 156 of file os_unix.c.

unsigned long os_random (  void   )

Get pseudo random value (not necessarily very strong). Returns: Pseudo random value Definition at line 107 of file os_unix.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 184 of file os_unix.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 113 of file os_unix.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 167 of file os_unix.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 20 of file os_unix.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 173 of file os_unix.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 210 of file os_unix.c.

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