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Re: einval-on-wrong-args patch


Friday, 16 February, 2001 Christopher Faylor wrote:

>>  return  EINVAL  if  signal()  or  lseek()  are  called  with illegal

CF> Either your signal() change is not quite right, or sigaction() is wrong.
CF> sigaction() allows setting the handler for SIGKILL to SIG_DFL.  Is
CF> that incorrect?  If not, then please modify your change (and check it in).
CF> If it is the incorrect behavior, could you fix sigaction, too?

SUSv2 is a bit vague on the subject, but this program

#include <stdio.h>
#include <signal.h>

main ()
  struct sigaction act;
  act.sa_handler = SIG_DFL;
  act.sa_flags = 0;
  act.sa_sigaction = NULL;
  sigemptyset ( &act.sa_mask );
  if ( signal ( SIGKILL, SIG_DFL ) == SIG_ERR ) perror ("signal" );
  if ( sigaction ( SIGKILL, NULL, NULL ) ) perror ( "sigaction1" );
  if ( sigaction ( SIGKILL, &act, NULL ) ) perror ( "sigaction2" );

when run on linux, prints

signal: Invalid argument
sigaction2: Invalid argument

so  perhaps sigaction should be fixed. moreover, SUSv2 says that if we
add SIGKILL or SIGSTOP to sa_mask, this should be silently ignored.

Egor.   ICQ 5165414 FidoNet 2:5020/496.19

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