procexec/print_wait_status.c

+/* print_wait_status.c
+
+   Dissect and print the process termination status returned by wait()
+   and related calls.
+*/
 #define _GNU_SOURCE     /* Get strsignal() declaration from <string.h> */
 #include <string.h>
 #include <sys/wait.h>
 #include "print_wait_status.h"  /* Declaration of printWaitStatus() */
 #include "tlpi_hdr.h"
 
 /* NOTE: The following function employs printf(), which is not
    async-signal-safe (see Section 21.1.2). As such, this function is
    also not async-signal-safe (i.e., beware of calling it from a
    SIGCHLD handler). */
 
 void                    /* Examine a wait() status using the W* macros */
 printWaitStatus(const char *msg, int status)
 {
     if (msg != NULL)
         printf("%s", msg);
 
     if (WIFEXITED(status)) {
         printf("child exited, status=%d\n", WEXITSTATUS(status));
 
     } else if (WIFSIGNALED(status)) {
         printf("child killed by signal %d (%s)",
                 WTERMSIG(status), strsignal(WTERMSIG(status)));
 #ifdef WCOREDUMP        /* Not in SUSv3, may be absent on some systems */
         if (WCOREDUMP(status))
             printf(" (core dumped)");
 #endif
         printf("\n");
 
     } else if (WIFSTOPPED(status)) {
         printf("child stopped by signal %d (%s)\n",
                 WSTOPSIG(status), strsignal(WSTOPSIG(status)));
 
 #ifdef WIFCONTINUED     /* SUSv3 has this, but older Linux versions and
                            some other UNIX implementations don't */
     } else if (WIFCONTINUED(status)) {
         printf("child continued\n");
 #endif
 
     } else {            /* Should never happen */
         printf("what happened to this child? (status=%x)\n",
                 (unsigned int) status);
     }
 }