#define sigsetmask(SIG) sys_sigsetmask (SIG)
#define sighold(SIG) ONLY_USED_IN_BSD_4_1
#define sigrelse(SIG) ONLY_USED_IN_BSD_4_1
+#define signal(SIG,ACT) sys_signal(SIG,ACT)
/* Whether this is what all systems want or not, this is what
appears to be assumed in the source, for example data.c:arith_error. */
#ifdef USG5_4
#ifndef sigblock
-#define sigblock(sig) (sigprocmask (SIG_BLOCK, SIGEMPTYMASK & sig, NULL))
+#define sigblock(sig) (sigprocmask (SIG_BLOCK, SIGEMPTYMASK | sig, NULL))
#endif
#define sigunblock(sig) (sigprocmask (SIG_SETMASK, SIGFULLMASK & ~(sig), NULL))