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8.6.c
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8.6.c
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
void pr_exit(int status);
int main()
{
pid_t pid;
int status;
if( (pid=fork()) < 0)
{
printf("fork error!\n");
return -1;
}
else if (pid == 0) /* child */
{
exit(7);
}
if (wait(&status) != pid)
{
printf("wait error!\n");
return -1;
}
pr_exit(status);
if( (pid=fork()) < 0)
{
printf("fork error!\n");
return -1;
}
else if (pid == 0) /* child */
{
abort();
}
if (wait(&status) != pid)
{
printf("wait error\n");
return -1;
}
pr_exit(status);
if( (pid=fork()) < 0)
{
printf("fork error!\n");
return -1;
}
else if(pid == 0) /* child */
{
status /= 0;
}
if(wait(&status) != pid)
{
printf("wait error\n");
return -1;
}
pr_exit(status);
return 0;
}
void pr_exit(int status)
{
if(WIFEXITED(status))
printf("normal termination, exit status = %d\n", WEXITSTATUS(status));
else if(WIFSIGNALED(status))
printf("abnormal termination, signal number = %d%s\n", WTERMSIG(status),
#ifdef WCOREDUMP
WCOREDUMP(status) ? " (core file generated)" : "");
#else
"");
#endif
else if(WIFSTOPPED(status))
printf("child stopped, signal number = %d\n",
WSTOPSIG(status));
}