time_utils.c File Reference

#include <string.h>
#include <stdlib.h>
#include <sys/time.h>
#include <assert.h>
#include <unistd.h>
#include <time.h>
#include <glib.h>
#include <curl/curl.h>
#include <curl/types.h>
#include <curl/easy.h>
#include "log.h"
#include "time_utils.h"

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Data Structures
struct	tzhead
struct	MemoryStruct
Defines
#define	MINUTES(x)   60*x
#define	HOURS(x)   60*60*x
#define	DATE_STRING_LENGTH   64
#define	TZ_FILES_DIR   "/usr/share/zoneinfo/Etc/"
#define	DEFAULT_TIMEZONE_OFFSET   0
#define	DEFAULT_TIMEZONE_NAME   "GMT+00:00"
#define	DST_FLAG   "DST"
Functions
static void *	myrealloc (void *ptr, size_t size)
static size_t	writer (void *ptr, size_t size, size_t nmemb, void *data)
time_t	get_server_time ()
gchar *	get_timezone ()
gboolean	set_timezone (const char *tzname, gboolean is_dst)
gint	get_timezone_index (const char *tzname, gboolean *dst)
void	set_time_utc (time_t utc_time)
gboolean	set_time_from_server (void)

---

Define Documentation

#define DATE_STRING_LENGTH   64

Definition at line 42 of file time_utils.c.

#define DEFAULT_TIMEZONE_NAME   "GMT+00:00"

Definition at line 47 of file time_utils.c.

Referenced by get_timezone_index().

#define DEFAULT_TIMEZONE_OFFSET   0

Definition at line 46 of file time_utils.c.

#define DST_FLAG   "DST"

Definition at line 48 of file time_utils.c.

Referenced by get_timezone_index(), and set_timezone().

#define HOURS

(

x

)

60*60*x

Definition at line 40 of file time_utils.c.

#define MINUTES

(

x

)

60*x

Copyright (C) 2009 iRex Technologies B.V. All rights reserved.

Definition at line 39 of file time_utils.c.

#define TZ_FILES_DIR   "/usr/share/zoneinfo/Etc/"

Definition at line 44 of file time_utils.c.

Referenced by set_timezone().

---

Function Documentation

time_t get_server_time

(

)

Definition at line 94 of file time_utils.c.

References LOGPRINTF, MemoryStruct::memory, MemoryStruct::size, and writer().

Referenced by set_time_from_server().

{
    LOGPRINTF("entry");

    MemoryStruct chunk;
    chunk.memory = NULL;
    chunk.size = 0;

    curl_global_init(CURL_GLOBAL_ALL);
    CURL *curl_handle = curl_easy_init();

    curl_easy_setopt(curl_handle, CURLOPT_URL, "http://time.irexnet.com/epoch");
    curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, writer);
    curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, (void *)&chunk);
    curl_easy_setopt(curl_handle, CURLOPT_USERAGENT, "libcurl-agent/1.0");

    curl_easy_setopt(curl_handle, CURLOPT_LOW_SPEED_LIMIT, 1);
    curl_easy_setopt(curl_handle, CURLOPT_LOW_SPEED_TIME, 30);
    curl_easy_setopt(curl_handle, CURLOPT_CONNECTTIMEOUT, 30);

    curl_easy_perform(curl_handle);
    curl_easy_cleanup(curl_handle);

    time_t now = 0;
    if (chunk.memory != NULL) now = atoi(chunk.memory);

    if (chunk.memory) free(chunk.memory);
    curl_global_cleanup();

    return now;
}

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gchar* get_timezone

(

void

)

Definition at line 128 of file time_utils.c.

References ERRORPRINTF, LOGPRINTF, and TZ_FILE.

Referenced by init_widgets().

{
    LOGPRINTF("entry");

    char actual_tzfile[256];
    memset(actual_tzfile, 0, sizeof(actual_tzfile));
    
    // get timezone reference
    if (readlink(TZ_FILE, actual_tzfile, sizeof(actual_tzfile)) == -1)
    {
        ERRORPRINTF("Can't dereference symlink %s, errno [%d][%s]", TZ_FILE, errno, strerror(errno));
        return NULL;
    }
    
    // check if it exists
    if (!g_file_test(actual_tzfile, G_FILE_TEST_IS_REGULAR))
    {
        ERRORPRINTF("Can't find symlink target %s", actual_tzfile);
        return NULL;
    }
    
    return g_path_get_basename(actual_tzfile);
}

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gint get_timezone_index	(	const char *	tzname,
		gboolean *	dst
	)

Definition at line 178 of file time_utils.c.

References DEFAULT_TIMEZONE_NAME, DST_FLAG, LOGPRINTF, timezones, TOTAL_TIMEZONES, and WARNPRINTF.

Referenced by init_widgets().

{
    LOGPRINTF("entry");

    gboolean is_dst;
    gint tzindex = -1;
    
    if (tzname == NULL)
    {
        tzname = DEFAULT_TIMEZONE_NAME;
        WARNPRINTF("No timezone given, use default [%s]", tzname);
    }
    
    int tzlength = strlen(tzname);
    is_dst = g_str_has_suffix(tzname, DST_FLAG);
    if (is_dst)
    {
        // ignore DST suffix
        tzlength -= strlen(DST_FLAG);
    }
    
    int i;
    for (i=0; i<TOTAL_TIMEZONES; i++) 
    {
        if (strncmp(tzname, timezones[i].tzname, tzlength) == 0)
        {
            tzindex = i;
            break;
        }
    }

    if (tzindex == -1)
    {
        WARNPRINTF("Can't find zoneinfo for [%s]", tzname);
        tzindex = 12; // default to GMT
        is_dst = FALSE;
    }
    
    if (dst)
    {
        *dst = is_dst;
    }
    
    return tzindex;
}

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static void* myrealloc	(	void *	ptr,
		size_t	size
	)			[static]

Definition at line 71 of file time_utils.c.

Referenced by writer().

{
    if (ptr) return realloc(ptr, size);
    else return malloc(size);
}

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gboolean set_time_from_server

(

void

)

Definition at line 238 of file time_utils.c.

References ERRORPRINTF, get_server_time(), LOGPRINTF, and set_time_utc().

{
    LOGPRINTF("entry");
    
    time_t utc_time = get_server_time();
    if (utc_time == 0) {
        ERRORPRINTF("Failed to get server time");
        return FALSE;
    }
    
    set_time_utc(utc_time);
    return TRUE;
}

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void set_time_utc

(

time_t

utc_time

)

Definition at line 225 of file time_utils.c.

References LOGPRINTF.

Referenced by set_time_from_server().

{
    LOGPRINTF("entry");
    
    struct timeval tp;
    gettimeofday(&tp, NULL);
    tp.tv_sec = utc_time;
    settimeofday(&tp, NULL);

    system("/sbin/hwclock -w -u");
}

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gboolean set_timezone	(	const char *	tzname,
		gboolean	is_dst
	)

Definition at line 153 of file time_utils.c.

References DST_FLAG, ERRORPRINTF, LOGPRINTF, TZ_FILE, and TZ_FILES_DIR.

Referenced by datetime_base_save_datetime().

{
    LOGPRINTF("entry");

    char actual_tzfile[256];

    snprintf(actual_tzfile, 256, "%s%s%s", TZ_FILES_DIR, tzname, is_dst ? DST_FLAG : "");
    LOGPRINTF("symlink %s to %s", actual_tzfile, TZ_FILE);
    if (g_file_test(TZ_FILE, G_FILE_TEST_EXISTS) && (unlink(TZ_FILE) != 0))
    {
        ERRORPRINTF("Can't remove %s", TZ_FILE);
        return FALSE;
    }

    if (symlink(actual_tzfile, TZ_FILE) != 0)
    {
        ERRORPRINTF("Can't create symlink from %s to %s", actual_tzfile, TZ_FILE);
        return FALSE;
    }

    return TRUE;    
}

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static size_t writer	(	void *	ptr,
		size_t	size,
		size_t	nmemb,
		void *	data
	)			[static]

Definition at line 78 of file time_utils.c.

References MemoryStruct::memory, myrealloc(), and MemoryStruct::size.

Referenced by get_server_time().

{
    size_t realsize = size * nmemb;
    MemoryStruct *mem = (MemoryStruct *)data;

    mem->memory = (char*)myrealloc(mem->memory, mem->size + realsize + 1);
    if (mem->memory) 
    {
        memcpy(&(mem->memory[mem->size]), ptr, realsize);
        mem->size += realsize;
        mem->memory[mem->size] = 0;
    }
    return realsize;
}

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