[comp.bugs.4bsd] Interrupting signals not reset on exec

dpk@brl-sem.ARPA (Doug Kingston <dpk>) (11/12/86)

Index:	sys/sys/kern_exec.c 4.3BSD FIX

Description:
	In 4.3BSD, the ability to interrupt systemcalls is controlled
	on a per-signal basis through the user structure entry u.u_sigintr.
	Unfortunately, the bit is never reset.
	
Repeat-By:
	Run one of Doug Gwyn's system V shells compiled for 4.3BSD
	and watch the behavior of signals on editors or other other
	programs that have reads which should not be interrupted by signals.

Fix:
	In kern_exec.c, apply the following diff.  This will reset
	the sigintr behavior when it resets all the other signal
	parameters for the new process image.

*** /tmp/,RCSt1009882	Wed Nov 12 15:38:33 1986
--- kern_exec.c	Wed Oct 29 22:42:08 1986
***************
*** 343,348 ****
--- 343,349 ----
  	u.u_onstack = 0;
  	u.u_sigsp = 0;
  	u.u_sigonstack = 0;
+ 	u.u_sigintr = 0;
  
  	for (nc = u.u_lastfile; nc >= 0; --nc) {
  		if (u.u_pofile[nc] & UF_EXCLOSE) {