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Unblock signals using standard utilities

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0

In the past few weeks, I've noticed shells on macos hanging. Digging in, it appears that all new shells I create are blocking a fairly large set of signals. eg:

/* Show the current set of blocked signals */



#include <signal.h>

#include <stdlib.h>

#include <stdio.h>



int

main(int argc, char **argv)

{

        struct sigaction act = {{0}};

        sigset_t old;



        if(sigprocmask(SIG_SETMASK, NULL, &old)) {

                perror("sigprocmask");

                return EXIT_FAILURE;

        }

        printf("mask: %xn", old);



        return 0;

}

$ gcc show-mask.c 

$ ./a.out

mask: 7efe

This behavior is a bit annoying, but now that I know the problem it is easy to fix. But not quite easy enough. trap doesn't seem to do the trick (I'm using bash). What can I add to my .bash* startups to clear the set of blocked signals using standard utilities?

bash signals

share|improve this question

asked 1 hour ago

William PursellWilliam Pursell

2,57111 gold badge1212 silver badges1717 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Was this behavior always this way? What version of macOS are you using?
  
  – Wildcard
  2 mins ago
  

  
  
  
  

add a comment
 | 

0

In the past few weeks, I've noticed shells on macos hanging. Digging in, it appears that all new shells I create are blocking a fairly large set of signals. eg:

/* Show the current set of blocked signals */



#include <signal.h>

#include <stdlib.h>

#include <stdio.h>



int

main(int argc, char **argv)

{

        struct sigaction act = {{0}};

        sigset_t old;



        if(sigprocmask(SIG_SETMASK, NULL, &old)) {

                perror("sigprocmask");

                return EXIT_FAILURE;

        }

        printf("mask: %xn", old);



        return 0;

}

$ gcc show-mask.c 

$ ./a.out

mask: 7efe

This behavior is a bit annoying, but now that I know the problem it is easy to fix. But not quite easy enough. trap doesn't seem to do the trick (I'm using bash). What can I add to my .bash* startups to clear the set of blocked signals using standard utilities?

bash signals

share|improve this question

asked 1 hour ago

William PursellWilliam Pursell

2,57111 gold badge1212 silver badges1717 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Was this behavior always this way? What version of macOS are you using?
  
  – Wildcard
  2 mins ago
  

  
  
  
  

add a comment
 | 

In the past few weeks, I've noticed shells on macos hanging. Digging in, it appears that all new shells I create are blocking a fairly large set of signals. eg:

/* Show the current set of blocked signals */



#include <signal.h>

#include <stdlib.h>

#include <stdio.h>



int

main(int argc, char **argv)

{

        struct sigaction act = {{0}};

        sigset_t old;



        if(sigprocmask(SIG_SETMASK, NULL, &old)) {

                perror("sigprocmask");

                return EXIT_FAILURE;

        }

        printf("mask: %xn", old);



        return 0;

}

$ gcc show-mask.c 

$ ./a.out

mask: 7efe

This behavior is a bit annoying, but now that I know the problem it is easy to fix. But not quite easy enough. trap doesn't seem to do the trick (I'm using bash). What can I add to my .bash* startups to clear the set of blocked signals using standard utilities?

bash signals

share|improve this question

asked 1 hour ago

William PursellWilliam Pursell

2,57111 gold badge1212 silver badges1717 bronze badges

/* Show the current set of blocked signals */



#include <signal.h>

#include <stdlib.h>

#include <stdio.h>



int

main(int argc, char **argv)

{

        struct sigaction act = {{0}};

        sigset_t old;



        if(sigprocmask(SIG_SETMASK, NULL, &old)) {

                perror("sigprocmask");

                return EXIT_FAILURE;

        }

        printf("mask: %xn", old);



        return 0;

}

$ gcc show-mask.c 

$ ./a.out

mask: 7efe

share|improve this question

asked 1 hour ago

William PursellWilliam Pursell

2,57111 gold badge1212 silver badges1717 bronze badges

share|improve this question

asked 1 hour ago

William PursellWilliam Pursell

2,57111 gold badge1212 silver badges1717 bronze badges

asked 1 hour ago

William PursellWilliam Pursell

2,57111 gold badge1212 silver badges1717 bronze badges

asked 1 hour ago

William PursellWilliam Pursell

2,57111 gold badge1212 silver badges1717 bronze badges