Comments matter the most. Jan
--- /usr/include/sys/siginfo.h Tue Aug 13 07:52:26 2013 +++ ./siginfo.h Tue Apr 14 17:07:06 2015 @@ -135,7 +135,7 @@ typedef struct { int si_errno; /* error from errno.h */ union { int _pad[SI_PAD]; /* for future growth */ - struct { /* kill(), SIGCLD, siqqueue() */ + struct { /* kill(),SIGCHLD,sigqueue() */ pid_t _pid; /* process ID */ union { struct {