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Doc Bug #16771 posix_mkfifo() not properly documented
Submitted: 2002-04-23 17:47 UTC Modified: 2002-04-23 18:37 UTC
From: sean at caedmon dot net Assigned:
Status: Closed Package: Documentation problem
PHP Version: 4.0CVS-2002-04-23 OS: Linux 2.2.x (Debian)
Private report: No CVE-ID: None
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From: sean at caedmon dot net
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 [2002-04-23 17:47 UTC] sean at caedmon dot net 
posix_mkfifo('./FORK_FIFO', '0666'); // read&write by everyone

yeilds:
p-w---x--T    1 sean     sean            0 Apr 23 17:47 FORK_FIFO

?

it SHOULD yeild:
prw-rw-rw-

The only way for me to get rw, it seems, is with '900', which gives:
prw----r-T    1 sean     sean            0 Apr 23 17:48 FORK_FIFO

(note: I don't even know what T is..)
It's messed up, to say the least.

S

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 [2002-04-23 17:58 UTC] jr-php at quo dot to 
This is a usage error. You need to remove the quotes from around 0666.
 [2002-04-23 18:01 UTC] sean at caedmon dot net 
Partially true (I tried it without the quotes before I updated from cvs today):

posix_mkfifo('./FORK_FIFO', 666);
now gives:
prw-r--r--    1 sean     sean            0 Apr 23 18:00 FORK_FIFO

better, but still not correct.

S
 [2002-04-23 18:17 UTC] mfischer@php.net 
This is a user error. First, only the mode without the quotes INCLUDING the leading zero (because it actually needs to be octal). Second, the actual permission the fifo gets created under also depends on your umask (which is likely to be something like 0022). If you change your umask to 0000 and use 0666 it will work.

I'll reclassify this as a documentation problem because it's not really documented.
 [2002-04-23 18:17 UTC] jr-php at quo dot to 
That's probably because of the process's umask. Try:

posix_mkfifo('./FORK_FIFO', 0666);
chmod('./FORK_FIFO', 0666);
 [2002-04-23 18:37 UTC] mfischer@php.net 
It's now documented too, closing.
 
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