lib sigblock,sigrelse,sigsetmask,sigprocmask,sigvec

typ sigset_t ast.h signal.h

mem sigvec.sv_mask signal.h

cat{

#ifndef _mem_sigvec_sv_mask

# undef _lib_sigvec

#endif

#ifdef _lib_sigprocmask

# define sh_sigaction(s,action) do { sigset_t ss;\

sigemptyset(&ss);\

sigaddset(&ss,(s));\

sigprocmask(action,&ss,0); \

}while(0)

# define sigrelease(s) sh_sigaction(s,SIG_UNBLOCK)

# define sigblock(s) sh_sigaction(s,SIG_BLOCK)

# define sig_begin() sh_sigaction(0,SIG_SETMASK)

#else

# ifndef _lib_sigblock

# define sigblock(s)

# endif

# ifdef _lib_sigsetmask

# define sigrelease(s) sigsetmask(0)

# define sig_begin() sigsetmask(0)

# else

# ifdef _lib_sigrelse

# define sigrelease sigrelse

# define sig_begin()

# else

# define sig_begin() (0)

# define sigrelease(s) (0)

# endif /* _lib_sigrelse */

# endif /* _lib_sigsetmask */

#endif /* _lib_sigprocmask */

}end

tst output{

#include <signal.h>

int main()

{

#ifdef SIGRTMIN

printf("#undef _SIGRTMIN\n");

printf("#define _SIGRTMIN %d\n", SIGRTMIN);

#endif

#ifdef SIGRTMAX

printf("#undef _SIGRTMAX\n");

printf("#define _SIGRTMAX %d\n", SIGRTMAX);

#endif

return 0;

}

}end