mirror of
https://github.com/espressif/esp-idf.git
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300 lines
8.5 KiB
C
300 lines
8.5 KiB
C
/*
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* OS specific functions
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* Copyright (c) 2005-2009, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#ifndef OS_H
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#define OS_H
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#include "esp_types.h"
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "esp_err.h"
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// #include "esp32/rom/ets_sys.h"
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typedef time_t os_time_t;
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/**
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* os_sleep - Sleep (sec, usec)
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* @sec: Number of seconds to sleep
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* @usec: Number of microseconds to sleep
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*/
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void os_sleep(os_time_t sec, os_time_t usec);
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struct os_time {
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os_time_t sec;
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suseconds_t usec;
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};
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/**
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* os_get_time - Get current time (sec, usec)
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* @t: Pointer to buffer for the time
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* Returns: 0 on success, -1 on failure
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*/
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int os_get_time(struct os_time *t);
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/* Helper macros for handling struct os_time */
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#define os_time_before(a, b) \
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((a)->sec < (b)->sec || \
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((a)->sec == (b)->sec && (a)->usec < (b)->usec))
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#define os_time_sub(a, b, res) do { \
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(res)->sec = (a)->sec - (b)->sec; \
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(res)->usec = (a)->usec - (b)->usec; \
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if ((res)->usec < 0) { \
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(res)->sec--; \
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(res)->usec += 1000000; \
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} \
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} while (0)
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/**
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* os_mktime - Convert broken-down time into seconds since 1970-01-01
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* @year: Four digit year
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* @month: Month (1 .. 12)
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* @day: Day of month (1 .. 31)
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* @hour: Hour (0 .. 23)
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* @min: Minute (0 .. 59)
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* @sec: Second (0 .. 60)
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* @t: Buffer for returning calendar time representation (seconds since
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* 1970-01-01 00:00:00)
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* Returns: 0 on success, -1 on failure
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*
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* Note: The result is in seconds from Epoch, i.e., in UTC, not in local time
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* which is used by POSIX mktime().
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*/
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int os_mktime(int year, int month, int day, int hour, int min, int sec,
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os_time_t *t);
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/**
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* os_daemonize - Run in the background (detach from the controlling terminal)
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* @pid_file: File name to write the process ID to or %NULL to skip this
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* Returns: 0 on success, -1 on failure
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*/
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int os_daemonize(const char *pid_file);
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/**
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* os_daemonize_terminate - Stop running in the background (remove pid file)
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* @pid_file: File name to write the process ID to or %NULL to skip this
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*/
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void os_daemonize_terminate(const char *pid_file);
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/**
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* os_get_random - Get cryptographically strong pseudo random data
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* @buf: Buffer for pseudo random data
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* @len: Length of the buffer
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* Returns: 0 on success, -1 on failure
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*/
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int os_get_random(unsigned char *buf, size_t len);
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/**
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* os_random - Get pseudo random value (not necessarily very strong)
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* Returns: Pseudo random value
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*/
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unsigned long os_random(void);
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/**
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* os_rel2abs_path - Get an absolute path for a file
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* @rel_path: Relative path to a file
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* Returns: Absolute path for the file or %NULL on failure
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*
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* This function tries to convert a relative path of a file to an absolute path
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* in order for the file to be found even if current working directory has
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* changed. The returned value is allocated and caller is responsible for
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* freeing it. It is acceptable to just return the same path in an allocated
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* buffer, e.g., return strdup(rel_path). This function is only used to find
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* configuration files when os_daemonize() may have changed the current working
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* directory and relative path would be pointing to a different location.
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*/
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char * os_rel2abs_path(const char *rel_path);
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/**
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* os_program_init - Program initialization (called at start)
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* Returns: 0 on success, -1 on failure
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*
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* This function is called when a programs starts. If there are any OS specific
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* processing that is needed, it can be placed here. It is also acceptable to
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* just return 0 if not special processing is needed.
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*/
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int os_program_init(void);
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/**
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* os_program_deinit - Program deinitialization (called just before exit)
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*
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* This function is called just before a program exists. If there are any OS
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* specific processing, e.g., freeing resourced allocated in os_program_init(),
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* it should be done here. It is also acceptable for this function to do
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* nothing.
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*/
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void os_program_deinit(void);
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/**
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* os_setenv - Set environment variable
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* @name: Name of the variable
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* @value: Value to set to the variable
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* @overwrite: Whether existing variable should be overwritten
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* Returns: 0 on success, -1 on error
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*
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* This function is only used for wpa_cli action scripts. OS wrapper does not
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* need to implement this if such functionality is not needed.
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*/
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int os_setenv(const char *name, const char *value, int overwrite);
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/**
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* os_unsetenv - Delete environent variable
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* @name: Name of the variable
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* Returns: 0 on success, -1 on error
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*
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* This function is only used for wpa_cli action scripts. OS wrapper does not
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* need to implement this if such functionality is not needed.
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*/
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int os_unsetenv(const char *name);
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/**
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* os_readfile - Read a file to an allocated memory buffer
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* @name: Name of the file to read
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* @len: For returning the length of the allocated buffer
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* Returns: Pointer to the allocated buffer or %NULL on failure
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*
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* This function allocates memory and reads the given file to this buffer. Both
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* binary and text files can be read with this function. The caller is
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* responsible for freeing the returned buffer with os_free().
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*/
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char * os_readfile(const char *name, size_t *len);
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/*
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* The following functions are wrapper for standard ANSI C or POSIX functions.
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* By default, they are just defined to use the standard function name and no
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* os_*.c implementation is needed for them. This avoids extra function calls
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* by allowing the C pre-processor take care of the function name mapping.
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*
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* If the target system uses a C library that does not provide these functions,
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* build_config.h can be used to define the wrappers to use a different
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* function name. This can be done on function-by-function basis since the
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* defines here are only used if build_config.h does not define the os_* name.
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* If needed, os_*.c file can be used to implement the functions that are not
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* included in the C library on the target system. Alternatively,
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* OS_NO_C_LIB_DEFINES can be defined to skip all defines here in which case
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* these functions need to be implemented in os_*.c file for the target system.
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*/
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#ifndef os_malloc
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#define os_malloc(s) malloc((s))
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#endif
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#ifndef os_realloc
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#define os_realloc(p, s) realloc((p), (s))
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#endif
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#ifndef os_zalloc
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#define os_zalloc(s) calloc(1, (s))
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#endif
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#ifndef os_free
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#define os_free(p) free((p))
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#endif
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#ifndef os_bzero
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#define os_bzero(s, n) bzero(s, n)
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#endif
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#ifndef os_strdup
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#ifdef _MSC_VER
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#define os_strdup(s) _strdup(s)
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#else
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#define os_strdup(s) strdup(s)
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#endif
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#endif
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char * ets_strdup(const char *s);
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#ifndef os_memcpy
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#define os_memcpy(d, s, n) memcpy((d), (s), (n))
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#endif
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#ifndef os_memmove
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#define os_memmove(d, s, n) memmove((d), (s), (n))
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#endif
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#ifndef os_memset
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#define os_memset(s, c, n) memset(s, c, n)
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#endif
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#ifndef os_memcmp
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#define os_memcmp(s1, s2, n) memcmp((s1), (s2), (n))
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#endif
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#ifndef os_memcmp_const
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#define os_memcmp_const(s1, s2, n) memcmp((s1), (s2), (n))
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#endif
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#ifndef os_strlen
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#define os_strlen(s) strlen(s)
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#endif
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#ifndef os_strcasecmp
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#ifdef _MSC_VER
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#define os_strcasecmp(s1, s2) _stricmp((s1), (s2))
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#else
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#define os_strcasecmp(s1, s2) strcasecmp((s1), (s2))
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#endif
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#endif
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#ifndef os_strncasecmp
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#ifdef _MSC_VER
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#define os_strncasecmp(s1, s2, n) _strnicmp((s1), (s2), (n))
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#else
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#define os_strncasecmp(s1, s2, n) strncasecmp((s1), (s2), (n))
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#endif
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#endif
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#ifndef os_strchr
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#define os_strchr(s, c) strchr((s), (c))
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#endif
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#ifndef os_strcmp
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#define os_strcmp(s1, s2) strcmp((s1), (s2))
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#endif
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#ifndef os_strncmp
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#define os_strncmp(s1, s2, n) strncmp((s1), (s2), (n))
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#endif
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#ifndef os_strncpy
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#define os_strncpy(d, s, n) strncpy((d), (s), (n))
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#endif
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#ifndef os_strrchr
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#define os_strrchr(s, c) strrchr((s), (c))
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#endif
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#ifndef os_strstr
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#define os_strstr(h, n) strstr((h), (n))
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#endif
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#ifndef os_snprintf
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#ifdef _MSC_VER
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#define os_snprintf _snprintf
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#else
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#define os_snprintf snprintf
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#endif
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#endif
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static inline int os_snprintf_error(size_t size, int res)
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{
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return res < 0 || (unsigned int) res >= size;
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}
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/**
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* os_strlcpy - Copy a string with size bound and NUL-termination
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* @dest: Destination
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* @src: Source
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* @siz: Size of the target buffer
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* Returns: Total length of the target string (length of src) (not including
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* NUL-termination)
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*
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* This function matches in behavior with the strlcpy(3) function in OpenBSD.
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*/
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size_t os_strlcpy(char *dest, const char *src, size_t siz);
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#endif /* OS_H */
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