incApache_aux.c

/* 
 * incApache_aux.c: funzioni ausiliarie per il web server
 *
 * Programma sviluppato a supporto del laboratorio di
 * Sistemi di Elaborazione e Trasmissione del corso di laurea
 * in Informatica classe L-31 presso l'Universita` degli Studi di
 * Genova per l'anno accademico 2022/2023.
 *
 * Copyright (C) 2012-2014 by Giovanni Chiola <chiolag@acm.org>
 * Copyright (C) 2015-2016 by Giovanni Lagorio <giovanni.lagorio@unige.it>
 * Copyright (C) 2016-2022 by Giovanni Chiola <chiolag@acm.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include "incApache.h"

void fail(const char *const msg)
{
	fprintf(stderr, "%s\n", msg);
	exit(EXIT_FAILURE);
}

void fail_errno(const char *const msg)
{
	perror(msg);
	exit(EXIT_FAILURE);
}

void *my_malloc(size_t size)
{
	void *result = malloc(size);
	if (result == NULL)
		fail("Cannot allocate memory with malloc");
	return result;
}

char *my_strdup(const char *const s)
{
	char *result = strdup(s);
	if (result == NULL)
		fail("Cannot allocate memory for strdup");
	return result;
}

ssize_t send_all(int fd, const char *ptr, size_t n, int flags)
{
	size_t n_left = n;
	while (n_left > 0) {
		ssize_t n_written = send(fd, ptr, n_left, flags);
		if (n_written < 0) {
			if (n_left == n)
				return -1; /* nothing has been sent */
			else
				break; /* we have sent something */
		} else if (n_written == 0) {
			break;
		}
		n_left -= n_written;
		ptr += n_written;
	}
	assert(n - n_left >= 0);
	return n - n_left;
}


static pthread_mutex_t my_timegm_mutex = PTHREAD_MUTEX_INITIALIZER;

time_t my_timegm(struct tm *tm)
{
               time_t ret;
               char *tz;

        /*** Guess what is missing here ... ***/
/*** TO BE DONE 6.0 START ***/
    tz = getenv("TZ");
/*** TO BE DONE 6.0 END ***/

               setenv("TZ", "", 1);
               tzset();
               ret = mktime(tm);
               if (tz) {
                   setenv("TZ", tz, 1);
                   free(tz);
               } else
                   unsetenv("TZ");

        /*** Guess what is missing here ... ***/
/*** TO BE DONE 6.0 START ***/
    
	tzset();

/*** TO BE DONE 6.0 END ***/

               return ret;
}