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digitalmars.D.bugs - [Issue 6709] New: execvp eats two bytes of its first argument.

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=6709

           Summary: execvp eats two bytes of its first argument.
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody puremagic.com
        ReportedBy: rivercheng gmail.com


--- Comment #0 from Cheng Wei <rivercheng gmail.com> 2011-09-21 19:44:36 PDT ---
#import std.process
void main() {
    execvp("ip", "route");
}

result:
Object "ute" is unknown, try "ip help".

That is the first two bytes are lost

Adding two spaces works:
#import std.process
void main() {
    execvp("ip", "  route");
}

Version 2.055, linux, 32bit

Thanks.

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next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=6709


hsteoh quickfur.ath.cx changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hsteoh quickfur.ath.cx


--- Comment #1 from hsteoh quickfur.ath.cx 2012-02-24 19:41:34 PST ---
You're calling execvp with the wrong arguments. You need to call it like this:

execvp("ip", ["ip", "route"]);

because argv[0] is supposed to be the name of the program, and argv[1]... are
the program arguments.

As for the actual bug (first two characters get eaten), it's not a Phobos bug,
it's a bug in /bin/ip. To prove this, try this (from your home directory):

ln -s /bin/ip ./route
./route

You'll get the same error message, because argv in this case = ["ip"]. It
appears that /bin/ip is doing something strange when argv[0] is not equal to
"ip", but there's not much Phobos can do about it.

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prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=6709


hsteoh quickfur.ath.cx changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID


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