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authorRoland McGrath <roland@gnu.org>1999-01-23 13:08:38 +0000
committerRoland McGrath <roland@gnu.org>1999-01-23 13:08:38 +0000
commitc0d9fffd58bd33e757980216d789921f9c0fa5a3 (patch)
treee6e3f6ea266c3fea3bd1428d0c1ca50254ed06f0 /sysdeps/gnu/errlist.awk
parentd26bda6b531ac531352d91c9c3ac7942ac4ffd58 (diff)
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1999-01-23 Roland McGrath <roland@baalperazim.frob.com>
* sysdeps/gnu/errlist.awk: Add comment.
Diffstat (limited to 'sysdeps/gnu/errlist.awk')
-rw-r--r--sysdeps/gnu/errlist.awk14
1 files changed, 11 insertions, 3 deletions
diff --git a/sysdeps/gnu/errlist.awk b/sysdeps/gnu/errlist.awk
index b97f078910..0616b0303d 100644
--- a/sysdeps/gnu/errlist.awk
+++ b/sysdeps/gnu/errlist.awk
@@ -25,9 +25,17 @@
 # @end deftypevr
 
 BEGIN {
-    alias["EWOULDBLOCK"] = "EAGAIN";
-    alias["EDEADLOCK"] = "EDEADLK";
-    alias["ENOTSUP"] = "EOPNOTSUPP";
+
+    # Here we list the E* names that might be duplicate names for the
+    # same integer value on some systems.  This causes the code below
+    # to generate ``#if defined (ALIAS) && ALIAS != ORIGINAL'' in the code,
+    # so the output does not presume that these are in fact aliases.
+    # We list here all the known potential cases on any system,
+    # so that the C source we produce will do the right thing based
+    # on the actual #define'd values it's compiled with.
+    alias["EWOULDBLOCK"]= "EAGAIN";
+    alias["EDEADLOCK"]	= "EDEADLK";
+    alias["ENOTSUP"]	= "EOPNOTSUPP";
 
     print "/* This file is generated from errno.texi by errlist.awk.  */"
     print "";