Re^2: system() Creating Different Results than Commandline Operation.

due to major changes to gcov over versions it needs to be opened to see what version is installed. the code makes a call to:

if (system_no_output(3, $gcov_tool, "--help") == -1)
[download]

using your solution to rewrite system_no_output seems to hang waiting for gcov to return. I don't understand why.

Comment on Re^2: system() Creating Different Results than Commandline Operation. Download Code

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Re^3: system() Creating Different Results than Commandline Operation. by ikegami (Patriarch) on Apr 06, 2009 at 18:12 UTC
`-1` is not a valid value for `$?`, so it's a bug to expect `system_no_output` to return `-1`. If you want `-1` when `system` fails and `$?` otherwise, you want: `# Your version $result = system(@_);` [download] `# My version my $pid = open3($chld_in, $chld_out, $chld_err, @_) or return -1;` [download] your solution to rewrite system_no_output seems to hang waiting for gcov to return `system` waits for the child to return, so I did the same.	[reply] [d/l] [select]

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-1 is not a valid value for $?, so it's a bug to expect system_no_output to return -1.

If you want -1 when system fails and $? otherwise, you want:

# Your version
$result = system(@_);
[download]

# My version
my $pid = open3($chld_in, $chld_out, $chld_err, @_)
    or return -1;
[download]

your solution to rewrite system_no_output seems to hang waiting for gcov to return

system waits for the child to return, so I did the same.