[hackers] [st] Call _exit() instead of exit() if exec*() fails || sin

[git]

commit 4418939dd9f3a7b3cfd3071234ed18ae86538f2a
Author: sin <s...@2f30.org>
Date:   Tue Nov 11 18:29:11 2014 +0000

    Call _exit() instead of exit() if exec*() fails
    
    exit() will also unwind the atexit() functions.  This is bad
    because if exec*() fails the process is in an inconsistent state.

diff --git a/st.c b/st.c
index 068fbb3..4499be6 100644
--- a/st.c
+++ b/st.c
@@ -1190,7 +1190,7 @@ execsh(void) {
        signal(SIGALRM, SIG_DFL);
 
        execvp(prog, args);
-       exit(EXIT_FAILURE);
+       _exit(EXIT_FAILURE);
 }
 
 void