From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i586; en-US; rv:1.2.1) Gecko/20030225

Description of problem:
sigprocmask is setting the signal mask even though an invalid how is sent to the
kernel. Most programs do not use invalid how parameters, but setting the mask is
unexpected. I read through the glibc code and it looks like a straight pass
through to the kernel.

Version-Release number of selected component (if applicable):
kernel-2.4.20-13.9

How reproducible:
Always

Steps to Reproduce:
1. Compile and run the following program:

#include <stdio.h>
#include <signal.h>
 
int main(void)
{
        sigset_t actl, oactl;
        sigemptyset(&actl);
        sigemptyset(&oactl);
 
        sigaddset(&actl, SIGABRT);
        sigprocmask(SIG_SETMASK, &actl, NULL); // init mask to just SIGABRT
                                                                                
        sigaddset(&actl, SIGALRM);
        if (sigprocmask(20000, &actl, NULL) != -1) {
                perror("sigprocmask() did not fail even though invalid how
parameter was passed to it.\n");
                return 1;
        }
                                                                                
        sigprocmask(SIG_SETMASK, NULL, &oactl); // read mask
        if (sigismember(&oactl, SIGALRM) == 1) {
                printf("FAIL: SIGALRM was set even though how is bad. \n");
                return 1;
        }
 
        return 0;
}


Actual Results:  FAIL: SIGALRM was set even though how is bad.

Expected Results:  No printout from program