[ruby-dev:23792] Re: [ruby-cvs] ruby/lib/net, ruby/lib, ruby/ext/socket, ruby: * ext/socket/socket.c (sock_sockaddr): Socket#gethostbyname()

なかだです。

At Fri, 25 Jun 2004 08:10:55 +0900,
matz wrote in [ruby-cvs:12084]:
>   1.283       +9   -9    ruby/io.c
>     http://www.ruby-lang.org/cgi-bin/cvsweb.cgi/ruby/io.c?cvsroot=src&r1=1.282&r2=1.283

@@ -2382,5 +2382,5 @@ rb_fopen(fname, mode)
     }
 #ifdef USE_SETVBUF
-    if (setvbuf(file, NULL, _IOFBF, 0) != 0)
+    if (setvbuf(file, NULL, _IOFBF, 0) < 0)
 	rb_warn("setvbuf() can't be honoured for %s", fname);
 #endif
@@ -2425,5 +2425,5 @@ rb_fdopen(fd, mode)
 
 #ifdef USE_SETVBUF
-    if (setvbuf(file, NULL, _IOFBF, 0) != 0)
+    if (setvbuf(file, NULL, _IOFBF, 0) < 0)
 	rb_warn("setvbuf() can't be honoured (fd=%d)", fd);
 #endif
@@ -3279,5 +3279,5 @@ rb_io_reopen(argc, argv, file)
     }
 #ifdef USE_SETVBUF
-    if (setvbuf(fptr->f, NULL, _IOFBF, 0) != 0)
+    if (setvbuf(fptr->f, NULL, _IOFBF, 0) < 0)
 	rb_warn("setvbuf() can't be honoured for %s", RSTRING(fname)->ptr);
 #endif

setvbuf()はエラーのときには0以外を返すとしか規定されていないよ
うです。

http://www.opengroup.org/onlinepubs/007908799/xsh/setvbuf.html
RETURN VALUE
    Upon successful completion, setvbuf() returns 0. Otherwise,
    it returns a non-zero value if an invalid value is given
    for type or if the request cannot be honoured.

-- 
--- 僕の前にBugはない。
--- 僕の後ろにBugはできる。
    中田 伸悦