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authornormal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2018-06-05 20:46:56 (GMT)
committernormal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2018-06-05 20:46:56 (GMT)
commit894628ac02f087a715513d260a1dc70b1e38414f (patch)
tree27e6ec90d16a88dbcfb2c421c72b4ec7337e35e4 /io.c
parente1e61c5b60c4d4806e9565ea480394be0c0b1425 (diff)
io.c: fix compilation when IOV_MAX is not defined
GNU/Hurd has writev(2) but does not define IOV_MAX [ruby-core:87417] [Bug #14827] Reported-by: Paul Sonnenschein git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63576 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'io.c')
-rw-r--r--io.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/io.c b/io.c
index 4c01726..1d7626c 100644
--- a/io.c
+++ b/io.c
@@ -1626,6 +1626,16 @@ io_fwritev(int argc, VALUE *argv, rb_io_t *fptr)
return n;
}
+
+static int
+iovcnt_ok(int iovcnt)
+{
+#ifdef IOV_MAX
+ return iovcnt < IOV_MAX;
+#else /* GNU/Hurd has writev, but no IOV_MAX */
+ return 1;
+#endif
+}
#endif /* HAVE_WRITEV */
static VALUE
@@ -1649,7 +1659,7 @@ io_writev(int argc, VALUE *argv, VALUE io)
for (i = 0; i < argc; i += cnt) {
#ifdef HAVE_WRITEV
- if ((fptr->mode & (FMODE_SYNC|FMODE_TTY)) && ((cnt = argc - i) < IOV_MAX)) {
+ if ((fptr->mode & (FMODE_SYNC|FMODE_TTY)) && iovcnt_ok(cnt = argc - i)) {
n = io_fwritev(cnt, &argv[i], fptr);
}
else