Peter S. Mazinger wrote: >> >>+#ifndef LIBC_SIGACTION >> hidden_weak_alias(__libc_sigaction,__sigaction) >> weak_alias(__libc_sigaction,sigaction) >>+#endif > > > where will LIBC_SIGACTION be defined, what is it's purpose? > It will be defined in 'libpthread/nptl/sysdeps/pthread/sigaction.c'. It is used by NPTL. -Steve