For years I've wanted an execve() system call modification that let me pass a NULL as the first argument to say "re-exec this program please". Because on nommu you've got to exec something to unblock vfork(), and daemons (or things like busybox and toybox) want to re-exec themselves. I just hit this again trying to implement a nommu-friendly strace(): the one on github doesn't SIGSTOP the child before the execve() of the process to trace because vfork(), and just races and misses the first few system calls on nommu instead...) The problem with exec /proc/self/exe is A) I haven't necessarily got /proc mounted, B) in a chroot the original binary might not be in scope anymore. But I'm already _running_ this program. If I could fork() I could already get a second copy of the sucker and call main() again myself if necessary, but I can't, so... I'm aware there's a possible "but what if it was suid and it's already dropped privileges" argument, and I'm fine with execve(NULL) not honoring the suid bit if people feel that way. I just wanna unblock vfork() while still running this code. (A way to detect I did this would be great too, but the normal tweaking of argv[] or envp[] to let main know we're a child still works.) Is there a _reason_ the kernel doesn't do this, or has nobody bothered to code it up yet? Rob -- To unsubscribe from this list: send the line "unsubscribe linux-embedded" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
