Hi again!
from sys/wait.h:

#define>_WSTATUS(x)<--->(_W_INT(x) & 0177)
#define>_WSTOPPED<----->0177<--><------>/* _WSTATUS if process is stopped */
#define>WIFSTOPPED(x)<->(_WSTATUS(x) == _WSTOPPED)
#define>WSTOPSIG(x)<--->(_W_INT(x) >> 8)
#define>WIFSIGNALED(x)<>(_WSTATUS(x) != _WSTOPPED && _WSTATUS(x) != 0)
#define>WTERMSIG(x)<--->(_WSTATUS(x))
#define>WIFEXITED(x)<-->(_WSTATUS(x) == 0)
#define>WEXITSTATUS(x)<>(_W_INT(x) >> 8)
#define>WIFCONTINUED(x)>(x == 0x13)<--->/* 0x13 == SIGCONT */
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