Re: PR/53998 CVS commit: src/sys/kern

[Christos Zoulas <christos%zoulas.com@localhost>]

The following reply was made to PR kern/53998; it has been noted by GNATS.

From: Christos Zoulas <christos%zoulas.com@localhost>
To: "gnats-bugs%netbsd.org@localhost" <gnats-bugs%NetBSD.org@localhost>
Cc: kern-bug-people%netbsd.org@localhost,
 gnats-admin%netbsd.org@localhost,
 netbsd-bugs%netbsd.org@localhost,
 joel.bertrand%systella.fr@localhost
Subject: Re: PR/53998 CVS commit: src/sys/kern
Date: Sat, 23 Feb 2019 09:43:40 -0500

 The original program was incorrect; here's a fixed version that works as =
 expected.
 
 christos
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <semaphore.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 
 static void
 sem_create(sem_t **semaphore)
 {
         char    name[15];
 
         sprintf(name, "/TEST-%d", getpid());
         printf("> %s\n", name);
         fflush(NULL);
 
         if ((*semaphore =3D sem_open(name, O_RDWR | O_CREAT | O_EXCL,
                         S_IRUSR | S_IWUSR, 0)) =3D=3D SEM_FAILED)
         {
                 perror("sem_open()");
                 fflush(NULL);
         }
 
         return;
 }
 
 static void
 sem_delete(sem_t **semaphore)
 {
         char    name[15];
 
         sprintf(name, "/TEST-%d", getpid());
         printf("< %s\n", name);
         fflush(NULL);
 
         if (sem_close(*semaphore) !=3D 0)
         {
                 perror("sem_close");
                 fflush(NULL);
         }
 
         printf("After sem_close()\n");
         sem_unlink(name);
 
         return;
 }
 
 int
 main()
 {
         int             pid;
         sem_t   *semaphore;
 
         sem_create(&semaphore);
 
         pid =3D fork();
 
         if (pid > 0)
         {
                 printf("Parent process\n");
                 sem_delete(&semaphore);
                 printf("End of parent process\n");
                 fflush(NULL);
                 _exit(EXIT_SUCCESS);
         }
 
         sleep(1);
 
         setsid();
         pid =3D fork();
 
         if (pid > 0)
         {
                 printf("End of second process\n");
                 fflush(NULL);
                 _exit(EXIT_SUCCESS);
         }
 
         printf("Daemonized process\n");
         fflush(NULL);
         sem_create(&semaphore);
         printf("Closing semaphore\n");
         fflush(NULL);
         sem_delete(&semaphore);
         printf("End\n");
         fflush(NULL);
 
         sleep(1);
 
         exit(EXIT_SUCCESS);
 }