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Bug #39869 safe_read does not initialize errno
Submitted: 2006-12-18 15:20 UTC Modified: 2006-12-19 09:18 UTC
From: michiel at boland dot org Assigned: dmitry (profile)
Status: Closed Package: CGI/CLI related
PHP Version: 5.2.0 OS: Solaris
Private report: No CVE-ID: None
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From: michiel at boland dot org
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 [2006-12-18 15:20 UTC] michiel at boland dot org 
Description:
------------
When using PHP in FastCGI mode, PHP has a tendency to once
in a while spin in a tight loop, hogging the cpu.

The fix is to initialize errno to 0 before any call to read()
in the safe_read function in sapi/cgi/fastcgi.c

Reproduce code:
---------------
Not applicable

Expected result:
----------------
n.a.

Actual result:
--------------
n.a.

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 [2006-12-18 17:33 UTC] dmitry@php.net 
Could you please provide which "errno" and "ret" values leads php into this loop.
 [2006-12-18 18:10 UTC] michiel at boland dot org 
If errno is already EINTR before entry into safe_read,
then that function will loop forever if the read() call
returns 0
 [2006-12-19 09:18 UTC] dmitry@php.net 
Fixed in CVS HEAD and PHP_5_2.
 
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