Bug->Doc #79017 [Opn->Ver]: Can delete files in use by other processes

Edit report at https://bugs.php.net/bug.php?id=79017&edit=1 ID: 79017 Updated by: cmb@php.net Reported by: asmanmmsj at gmail dot com -Summary: file_exists() return false on file flock() +Summary: Can delete files in use by other processes -Status: Open +Status: Verified -Type: Bug +Type: Documentation Problem Package: *Directory/Filesystem functions Operating System: windows -PHP Version: 7.4.1 +PHP Version: 7.3.0 Block user comment: N Private report: N New Comment: The behavior changed due to commit 17d621e[1], as of which all files are opened with the FILE_SHARE_DELETE flag set. This is closer to POSIX semantics than before[2], but due to some platform differences it is not identical. file_exists() returning false for the second process is actually correct; although the file is still there because the first process has an open handle to it, the file is no longer supposed to be accessible by the second process (even opening for reading would fail). The difference to POSIX behavior is that the second process can't even open the file for writing, but locking would neither work on POSIX. From the PHP side, I see this as documentation issue (while the migration guide hints at the behavioral change, it has to be clarified in the manual proper). With regard to the test script, I think it is generally an error to delete lock files which may have a lock on them; instead use a separate lock file, if necessary. [1] <http://git.php.net/?p=php-src.git;a=commit;h=17d621e7d3bc0a97d1ddddeb3e7fbdea25548637> [2] <https://www.php.net/manual/en/migration73.windows-support.php#migration73.windows-support.core.file-descriptors> Previous Comments: ------------------------------------------------------------------------ [2019-12-22 05:40:26] asmanmmsj at gmail dot com Description: ------------ hi file_exists() return false on locked file with flock()!! its ok on php 7.2 but after that its have problem... just run this test file 2 time in second time its not detect file exist because its locked with flock() Test script: --------------- <?php error_reporting(0); echo unlink("test.txt"); echo "<=unlink\r\n"; echo "\r\n>"; echo $exist = file_exists("test.txt");<<=== bug is here echo "<=exist\r\n"; if ($exist) { echo "!!!"; echo "\r\n"; sleep(1111); //exit(); } echo "\r\n>"; echo $file = fopen("test.txt","w+"); echo "<=fopn\r\n"; // exclusive lock echo "\r\n>"; echo $lockkk = flock($file,LOCK_EX); echo "<=lock\r\n"; if ($lockkk) { echo ">"; echo fwrite($file,"Add some text to the file."); echo "<=fwrite\r\n"; echo ">"; echo fflush($file); echo "<=fflush\r\n"; sleep(1000); // release lock flock($file,LOCK_UN); } else { echo "Error locking file!"; } echo "end:"; echo fclose($file); sleep(100); ?> Expected result: ---------------- fisrt run (and lock text.txt) sleep... result : ><=unlink ><=exist >Resource id #5<=fopn >1<=lock >26<=fwrite >1<=fflush second run (file already lock..) >1<=unlink ><=exist ><=fopn ><=lock Error locking file!end: OK result in php 7.2 : ><=unlink >1<=exist !!! Actual result: -------------- - ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=79017&edit=1