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* dcrt0.cc (get_cygwin_startup_info): Change zeros to DWORD array.

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Expect first DWORD in child_info struct being set to non-zero if
	wincap.needs_count_in_si_lpres2 is set.  Add comment to explain why.
	* fork.cc (frok::parent): Set ch.zero[0] to a sensible count value
	if wincap.needs_count_in_si_lpres2 is set.
	* spawn.cc (spawn_guts): Ditto.  Add filler bytes after ch on stack
	to accomodate needs_count_in_si_lpres2.
	* wincap.h: Define needs_count_in_si_lpres2 throughout.
	* wincap.cc: Ditto.
This commit is contained in:
Corinna Vinschen
2006-12-05 10:59:21 +00:00
parent 489bb390ce
commit c6674b53d3
6 changed files with 71 additions and 2 deletions
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13
winsup/cygwin/spawn.cc
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@@ -298,7 +298,13 @@ spawn_guts (const char * prog_arg, const char *const *argv,
pthread_cleanup_push (do_cleanup, (void *) &cleanup);
av newargv;
linebuf one_line;
child_info_spawn ch;
/* Allocate slightly bigger for call to CreateProcess to accomodate
needs_count_in_si_lpres2. */
struct {
child_info_spawn ch;
char filler[4];
} _ch;
#define ch _ch.ch
char *envblock = NULL;
path_conv real_path;
@@ -481,6 +487,10 @@ spawn_guts (const char * prog_arg, const char *const *argv,
si.lpReserved2 = (LPBYTE) &ch;
si.cbReserved2 = sizeof (ch);
/* See comment in dcrt0.cc, function get_cygwin_startup_info. */
if (wincap.needs_count_in_si_lpres2 ())
ch.zero[0] = sizeof (ch) / 5;
/* When ruid != euid we create the new process under the current original
account and impersonate in child, this way maintaining the different
effective vs. real ids.
@@ -724,6 +734,7 @@ out:
free (envblock);
pthread_cleanup_pop (1);
return (int) res;
#undef ch
}
extern "C" int