From: jik at kamens dot brookline dot ma dot us Operating system: Linux PHP version: 5.1.1 PHP Bug Type: IMAP related Bug description: php-imap doesn't trap USR2 when mailbox is locked
Description: ------------ The imap c-client has code in it to send a "kiss of death" SIGUSR2 to another process that has a mailbox locked, to cause that process to give up the lock if it no longer needs it. Anything which uses c-client is supposed to define a singla handler for SIGUSR2 to catch the signal and at minimum ignore it if the client doesn't want to relinquish the lock. If it doesn't do this, then the SIGUSR2 causes the process to die, and then the other process, which sent the signal, claims the lock. It appears that PHP's imap support doesn't define a SIGUSR2 handler, which means that if (a) imap_open is used to open a local file and (b) another process on the same machine happens to use c-client to open the same file at around the same time, the first process will die silently because of the SIGUSR2. To fix this, imap_open needs to define a SIGUSR2 handler to catch and ignore the signal while it's got the mailbox locked. Reproduce code: --------------- Put this script in a file and run it with one argument, the name of a non-empty local mailbox, twice at the same time, e.g. (from bash) "php /tmp/imap_open.php /var/mail/jik & php /tmp/imap_open.php /var/mail/jik". It may not fail every time, but at least some of the times you do this, okne of the two php processes will print an error and exit because of the USR2 signal. -- Edit bug report at http://bugs.php.net/?id=35894&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=35894&r=trysnapshot44 Try a CVS snapshot (PHP 5.1): http://bugs.php.net/fix.php?id=35894&r=trysnapshot51 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=35894&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=35894&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=35894&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=35894&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=35894&r=needscript Try newer version: http://bugs.php.net/fix.php?id=35894&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=35894&r=support Expected behavior: http://bugs.php.net/fix.php?id=35894&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=35894&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=35894&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=35894&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=35894&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=35894&r=dst IIS Stability: http://bugs.php.net/fix.php?id=35894&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=35894&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=35894&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=35894&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=35894&r=mysqlcfg
