(libc.info.gz) Process Completion Status

Info Catalog (libc.info.gz) Process Completion (libc.info.gz) Processes (libc.info.gz) BSD Wait Functions
 
 26.7 Process Completion Status
 ==============================
 
 If the exit status value ( Program Termination) of the child
 process is zero, then the status value reported by 'waitpid' or 'wait'
 is also zero.  You can test for other kinds of information encoded in
 the returned status value using the following macros.  These macros are
 defined in the header file 'sys/wait.h'.
 
  -- Macro: int WIFEXITED (int STATUS)
      Preliminary: | MT-Safe | AS-Safe | AC-Safe |  POSIX Safety
      Concepts.
 
      This macro returns a nonzero value if the child process terminated
      normally with 'exit' or '_exit'.
 
  -- Macro: int WEXITSTATUS (int STATUS)
      Preliminary: | MT-Safe | AS-Safe | AC-Safe |  POSIX Safety
      Concepts.
 
      If 'WIFEXITED' is true of STATUS, this macro returns the low-order
      8 bits of the exit status value from the child process.   Exit
      Status.
 
  -- Macro: int WIFSIGNALED (int STATUS)
      Preliminary: | MT-Safe | AS-Safe | AC-Safe |  POSIX Safety
      Concepts.
 
      This macro returns a nonzero value if the child process terminated
      because it received a signal that was not handled.   Signal
      Handling.
 
  -- Macro: int WTERMSIG (int STATUS)
      Preliminary: | MT-Safe | AS-Safe | AC-Safe |  POSIX Safety
      Concepts.
 
      If 'WIFSIGNALED' is true of STATUS, this macro returns the signal
      number of the signal that terminated the child process.
 
  -- Macro: int WCOREDUMP (int STATUS)
      Preliminary: | MT-Safe | AS-Safe | AC-Safe |  POSIX Safety
      Concepts.
 
      This macro returns a nonzero value if the child process terminated
      and produced a core dump.
 
  -- Macro: int WIFSTOPPED (int STATUS)
      Preliminary: | MT-Safe | AS-Safe | AC-Safe |  POSIX Safety
      Concepts.
 
      This macro returns a nonzero value if the child process is stopped.
 
  -- Macro: int WSTOPSIG (int STATUS)
      Preliminary: | MT-Safe | AS-Safe | AC-Safe |  POSIX Safety
      Concepts.
 
      If 'WIFSTOPPED' is true of STATUS, this macro returns the signal
      number of the signal that caused the child process to stop.
 
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