cygwin programs called from non-cygwin programs mauling \" in args

Yitzchak Scott-Thoennes sthoenna@efn.org
Fri Jan 14 01:10:00 GMT 2005


On Wed, Jan 12, 2005 at 10:42:48PM -0800, Yitzchak Scott-Thoennes wrote:
> Given a simple child process that prints its argument, and a parent
> that execs it passing a\"b\"c, trying combinations of cygwin and non-
> cygwin parent and child shows inconsistency in what's received:
> 
> $ cat child.c
> #include <stdio.h>
> int main(int argc, char **argv)
> {
>   printf("[%s]\n", argv[1]);
>   return 0;
> }
> 
> $ cat parent.c
> #include <unistd.h>
> int main(int argc, char **argv) {
>   char *args[] = { argv[1], "a\\\"b\\\"c", 0};
>   execv( argv[1], args);
>   return 1;
> }
> 
> $ gcc -mno-cygwin -Wall child.c -o nocygchild
> 
> $ gcc -mno-cygwin -Wall parent.c -o nocygparent
> parent.c: In function `main':
> parent.c:4: warning: passing arg 2 of `execv' from incompatible pointer type

Incidentally, that warning is due to mingw having a non-compliant prototype.

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