(sigunblock): Define.

2 files changed, 6 insertions, 0 deletions

diff --git a/src/s/isc4-0.h b/src/s/isc4-0.h
index 53d0c07aea5..ccd6cb0627f 100644
--- a/src/s/isc4-0.h
+++ b/src/s/isc4-0.h
@@ -23,5 +23,8 @@
 #define sigblock(sig)                                   \
      (sigprocmask_set = SIGEMPTYMASK | (sig),           \
       sigprocmask (SIG_BLOCK, &sigprocmask_set, NULL))
+#define sigunblock(sig)                                         \
+     (sigprocmask_set = SIGFULLMASK & ~(sig),                   \
+      sigprocmask (SIG_SETMASK, &sigprocmask_set, NULL))
 #endif
 #endif /* not POSIX_SIGNALS */
diff --git a/src/s/sco5.h b/src/s/sco5.h
index 89168b2068e..863f303f7a7 100644
--- a/src/s/sco5.h
+++ b/src/s/sco5.h
@@ -135,6 +135,9 @@ Boston, MA 02111-1307, USA.  */
 #define sigblock(sig)                                   \
      (sigprocmask_set = SIGEMPTYMASK | (sig),           \
       sigprocmask (SIG_BLOCK, &sigprocmask_set, NULL))
+#define sigunblock(sig)                                         \
+     (sigprocmask_set = SIGFULLMASK & ~(sig),                   \
+      sigprocmask (SIG_SETMASK, &sigprocmask_set, NULL))
 
 #ifndef PENDING_OUTPUT_COUNT
 #define PENDING_OUTPUT_COUNT(FILE) ((FILE)->__ptr - (FILE)->__base)