/* +----------------------------------------------------------------------+ | Copyright (c) The PHP Group | +----------------------------------------------------------------------+ | This source file is subject to version 3.01 of the PHP license, | | that is bundled with this package in the file LICENSE, and is | | available through the world-wide-web at the following url: | | http://www.php.net/license/3_01.txt | | If you did not receive a copy of the PHP license and are unable to | | obtain it through the world-wide-web, please send a note to | | license@php.net so we can mail you a copy immediately. | +----------------------------------------------------------------------+ | Author: Stig Sæther Bakken | +----------------------------------------------------------------------+ */ #include "php.h" #include #if HAVE_UNISTD_H #include #endif #include #include #include #ifdef PHP_WIN32 #include "win32/time.h" #else #include #endif #include "php_lcg.h" #ifdef HAVE_GETTIMEOFDAY ZEND_TLS struct timeval prev_tv = { 0, 0 }; /* {{{ Generates a unique ID */ PHP_FUNCTION(uniqid) { char *prefix = ""; zend_bool more_entropy = 0; zend_string *uniqid; int sec, usec; size_t prefix_len = 0; struct timeval tv; ZEND_PARSE_PARAMETERS_START(0, 2) Z_PARAM_OPTIONAL Z_PARAM_STRING(prefix, prefix_len) Z_PARAM_BOOL(more_entropy) ZEND_PARSE_PARAMETERS_END(); /* This implementation needs current microsecond to change, * hence we poll time until it does. This is much faster than * calling usleep(1) which may cause the kernel to schedule * another process, causing a pause of around 10ms. */ do { (void)gettimeofday((struct timeval *) &tv, (struct timezone *) NULL); } while (tv.tv_sec == prev_tv.tv_sec && tv.tv_usec == prev_tv.tv_usec); prev_tv.tv_sec = tv.tv_sec; prev_tv.tv_usec = tv.tv_usec; sec = (int) tv.tv_sec; usec = (int) (tv.tv_usec % 0x100000); /* The max value usec can have is 0xF423F, so we use only five hex * digits for usecs. */ if (more_entropy) { uniqid = strpprintf(0, "%s%08x%05x%.8F", prefix, sec, usec, php_combined_lcg() * 10); } else { uniqid = strpprintf(0, "%s%08x%05x", prefix, sec, usec); } RETURN_STR(uniqid); } #endif /* }}} */