Re: "close" failing

You probably do want to check the success of the close when you are doing a piped open like that. The likelihood is that the $ENV{PATH} is different for the web server process: you should either specify the full path to the program you are running or ensure that the location of the program is in $ENV{PATH} before opening the pipe. The reason you aren't seeing any error message is because the output of die is going to STDERR and mostly this goes into the error log rather than to the browser.

/J\

Comment on Re: "close" failing Select or Download Code

Replies are listed 'Best First'.
Re^2: "close" failing by jdhedden (Deacon) on May 31, 2006 at 12:37 UTC
I don't think that `$ENV{PATH}` has anything to do with the failure of the `close` statement. It would affect the success of `open`, but not `close`. Or am I missing something? Remember: There's always one more bug.	[reply] [d/l] [select]
Re^3: "close" failing by duff (Parson) on May 31, 2006 at 14:55 UTC
The return value of a piped `open` tells you if the fork succeeded or not, the return value of `close` tells you about the execution status of the program in the pipe. So, if `$ENV{PATH}` is set such that perl can't find the program to be piped to/from, `close` will return a false value (perl was able to successfully fork, but not execute the piped command). duff	[reply] [d/l] [select]
Re^4: "close" failing by jdhedden (Deacon) on May 31, 2006 at 15:26 UTC
I tried this, and it doesn't work as you described: If Perl can't find the program to be piped to, the `open` command fails. Remember: There's always one more bug.	[reply] [d/l]
Re^4: "close" failing by vek (Prior) on May 31, 2006 at 17:21 UTC
I'm not entirely sure that's correct. For my test code, if the program cannot be found, `open` will not succeed. `#!/usr/bin/perl -w use strict; open(BAD, "/no-such-path/not_here.sh \|") \|\| die "Died with: $!\n"; close(BAD);` [download] Does in fact `die` on `open` with `Died with: No such file or directory`. -- vek --	[reply] [d/l] [select]
Re^3: "close" failing by munishdev (Initiate) on May 31, 2006 at 14:06 UTC
thanks a lot for the replies. You are right here. Because the print statements worked fine after the open call. (in "do processing" section). So, it cannot be that open has failed.	[reply]


Perl-Sensitive Sunglasses
	PerlMonks