#include "fdop.h"
#include "libc.h"
-static void dummy_0()
-{
-}
-weak_alias(dummy_0, __acquire_ptc);
-weak_alias(dummy_0, __release_ptc);
-
struct args {
int p[2];
sigset_t oldmask;
args.envp = envp;
pthread_sigmask(SIG_BLOCK, SIGALL_SET, &args.oldmask);
- /* This lock prevents setuid/setgid operations while the parent
- * is sharing memory with the child. Situations where processes
- * with different permissions share VM are fundamentally unsafe. */
- __acquire_ptc();
pid = __clone(child, stack+sizeof stack, CLONE_VM|SIGCHLD, &args);
close(args.p[1]);
ec = -pid;
}
- /* At this point, the child has either exited or successfully
- * performed exec, so the lock may be released. */
- __release_ptc();
close(args.p[0]);
if (!ec) *res = pid;