This macro returns true if the child process exited normally. In this case, the macro WEXITSTATUS(status) returns the exit status of the child process. (As noted in Section 25.1, only the least significant byte of the child’s exit status is available to the parent.)
WIFSIGNALED(status)
This macro returns true if the child process was killed by a signal. In this case, the macro WTERMSIG(status) returns the number of the signal that caused the process to terminate, and the macro WCOREDUMP(status) returns true if the child process produced a core dump file. The WCOREDUMP() macro is not specified by SUSv3, but is available on most UNIX implementations.
WIFSTOPPED(status)
This macro returns true if the child process was stopped by a signal. In this case, the macro WSTOPSIG(status) returns the number of the signal that stopped the process.
WIFCONTINUED(status)
This macro returns true if the child was resumed by delivery of SIGCONT. This macro is available since Linux 2.6.10.
WIFEXITED(status)
This macro returns true if the child process exited normally. In this case, the macro WEXITSTATUS(status) returns the exit status of the child process. (As noted in Section 25.1, only the least significant byte of the child’s exit status is available to the parent.)
WIFSIGNALED(status)
This macro returns true if the child process was killed by a signal. In this case, the macro WTERMSIG(status) returns the number of the signal that caused the process to terminate, and the macro WCOREDUMP(status) returns true if the child process produced a core dump file. The WCOREDUMP() macro is not specified by SUSv3, but is available on most UNIX implementations.
WIFSTOPPED(status)
This macro returns true if the child process was stopped by a signal. In this case, the macro WSTOPSIG(status) returns the number of the signal that stopped the process.
WIFCONTINUED(status)
This macro returns true if the child was resumed by delivery of SIGCONT. This macro is available since Linux 2.6.10.