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* wpa_supplicant/hostapd / Internal implementation of OS specific functions
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* Copyright (c) 2005-2006, Jouni Malinen <j@w1.fi>
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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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* Alternatively, this software may be distributed under the terms of BSD
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* See README and COPYING for more details.
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* This file is an example of operating system specific wrapper functions.
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* This version implements many of the functions internally, so it can be used
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* to fill in missing functions from the target system C libraries.
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* Some of the functions are using standard C library calls in order to keep
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* this file in working condition to allow the functions to be tested on a
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* Linux target. Please note that OS_NO_C_LIB_DEFINES needs to be defined for
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* this file to work correctly. Note that these implementations are only
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* examples and are not optimized for speed.
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#undef OS_REJECT_C_LIB_FUNCTIONS
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void os_sleep(os_time_t sec, os_time_t usec)
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int os_get_time(struct os_time *t)
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res = gettimeofday(&tv, NULL);
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int os_mktime(int year, int month, int day, int hour, int min, int sec,
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if (year < 1970 || month < 1 || month > 12 || day < 1 || day > 31 ||
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hour < 0 || hour > 23 || min < 0 || min > 59 || sec < 0 ||
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os_memset(&tm, 0, sizeof(tm));
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tm.tm_year = year - 1900;
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tm.tm_mon = month - 1;
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*t = (os_time_t) mktime(&tm);
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int os_daemonize(const char *pid_file)
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FILE *f = fopen(pid_file, "w");
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fprintf(f, "%u\n", getpid());
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void os_daemonize_terminate(const char *pid_file)
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int os_get_random(unsigned char *buf, size_t len)
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f = fopen("/dev/urandom", "rb");
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printf("Could not open /dev/urandom.\n");
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rc = fread(buf, 1, len, f);
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return rc != len ? -1 : 0;
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unsigned long os_random(void)
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char * os_rel2abs_path(const char *rel_path)
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char *buf = NULL, *cwd, *ret;
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size_t len = 128, cwd_len, rel_len, ret_len;
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if (rel_path[0] == '/')
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return os_strdup(rel_path);
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buf = os_malloc(len);
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cwd = getcwd(buf, len);
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if (errno != ERANGE) {
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cwd_len = strlen(cwd);
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rel_len = strlen(rel_path);
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ret_len = cwd_len + 1 + rel_len + 1;
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ret = os_malloc(ret_len);
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os_memcpy(ret, cwd, cwd_len);
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os_memcpy(ret + cwd_len + 1, rel_path, rel_len);
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ret[ret_len - 1] = '\0';
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int os_program_init(void)
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void os_program_deinit(void)
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int os_setenv(const char *name, const char *value, int overwrite)
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return setenv(name, value, overwrite);
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int os_unsetenv(const char *name)
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#if defined(__FreeBSD__) || defined(__NetBSD__)
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return unsetenv(name);
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char * os_readfile(const char *name, size_t *len)
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f = fopen(name, "rb");
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fseek(f, 0, SEEK_END);
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fseek(f, 0, SEEK_SET);
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buf = os_malloc(*len);
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fread(buf, 1, *len, f);
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void * os_zalloc(size_t size)
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void *n = os_malloc(size);
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os_memset(n, 0, size);
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void * os_malloc(size_t size)
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void * os_realloc(void *ptr, size_t size)
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return realloc(ptr, size);
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void os_free(void *ptr)
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void * os_memcpy(void *dest, const void *src, size_t n)
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void * os_memmove(void *dest, const void *src, size_t n)
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os_memcpy(dest, src, n);
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/* overlapping areas */
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char *d = (char *) dest + n;
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const char *s = (const char *) src + n;
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void * os_memset(void *s, int c, size_t n)
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int os_memcmp(const void *s1, const void *s2, size_t n)
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const unsigned char *p1 = s1, *p2 = s2;
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char * os_strdup(const char *s)
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res = os_malloc(len + 1);
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os_memcpy(res, s, len + 1);
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size_t os_strlen(const char *s)
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int os_strcasecmp(const char *s1, const char *s2)
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* Ignoring case is not required for main functionality, so just use
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* the case sensitive version of the function.
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return os_strcmp(s1, s2);
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int os_strncasecmp(const char *s1, const char *s2, size_t n)
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* Ignoring case is not required for main functionality, so just use
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* the case sensitive version of the function.
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return os_strncmp(s1, s2, n);
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char * os_strchr(const char *s, int c)
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char * os_strrchr(const char *s, int c)
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int os_strcmp(const char *s1, const char *s2)
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int os_strncmp(const char *s1, const char *s2, size_t n)
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char * os_strncpy(char *dest, const char *src, size_t n)
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char * os_strstr(const char *haystack, const char *needle)
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size_t len = os_strlen(needle);
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if (os_strncmp(haystack, needle, len) == 0)
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return (char *) haystack;
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int os_snprintf(char *str, size_t size, const char *format, ...)
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/* See http://www.ijs.si/software/snprintf/ for portable
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* implementation of snprintf.
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va_start(ap, format);
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ret = vsnprintf(str, size, format, ap);
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str[size - 1] = '\0';