The GNU C Library - Process Completion Status

Process Completion Status

If the exit status value (see 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)

This macro returns a nonzero value if the child process terminated normally with exit or _exit .

Macro int WEXITSTATUS (int status)

If WIFEXITED is true of status, this macro returns the low-order 8 bits of the exit status value from the child process. See Exit Status.

Macro int WIFSIGNALED (int status)

This macro returns a nonzero value if the child process terminated because it received a signal that was not handled. See Signal Handling.

Macro int WTERMSIG (int status)

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)

This macro returns a nonzero value if the child process terminated and produced a core dump.

Macro int WIFSTOPPED (int status)

This macro returns a nonzero value if the child process is stopped.

Macro int WSTOPSIG (int status)

If WIFSTOPPED is true of status, this macro returns the signal number of the signal that caused the child process to stop.