On 04/19/2011 02:16 PM, Andy Koppe wrote:
> int main(int argc, char *argv[])
> {
> if (argc > 1 && !fork()) {
> execl("/proc/self/exe", argv[0], (char *)0);
> puts(strerror(errno));
> }
> return 0;
> }
>
> $ cc test.c
>
> $ ./a bla
> Bad file descriptor
>
> With 1.7.9, it prints nothing, which is the expected behaviour.
> Looking at POSIX, EBADF is not a valid errno for exec().EBADF is not listed for execl(), but _is_ listed for fexecve(), and when you consider that /proc/self is a special file system that opens file descriptors rather than files, it makes (a bit) of sense. At any rate, POSIX states that other errors than those documented (such as EBADF for execl()) may be returned if the condition for those errors matches other use of that errno value and does not skip over any existing mandated errors. It also means that maybe cygwin should behave as if O_EXEC rather than O_RDONLY were used when populating "/proc/self/exe", seeing as how execl() on that file basically boils down to an fexecve() call. -- Eric Blake ebl...@redhat.com +1-801-349-2682 Libvirt virtualization library http://libvirt.org
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