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authornobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2016-01-28 08:32:44 +0000
committernobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2016-01-28 08:32:44 +0000
commit173e287ff9cb9cf70e344fc2bceb535964486254 (patch)
treeda0fc822fc7f8c8500ee612c84574db11ffd2824 /ext/socket/socket.c
parentc308fa680ffabf2d8310ecb8d62b8da8c0b2b9d3 (diff)
socket.c: unlimited size hostname
* ext/socket/socket.c (sock_gethostname): support unlimited size hostname. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53677 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'ext/socket/socket.c')
-rw-r--r--ext/socket/socket.c26
1 files changed, 20 insertions, 6 deletions
diff --git a/ext/socket/socket.c b/ext/socket/socket.c
index dcf2498..542cd02 100644
--- a/ext/socket/socket.c
+++ b/ext/socket/socket.c
@@ -893,13 +893,27 @@ sock_gethostname(VALUE obj)
# define RUBY_MAX_HOST_NAME_LEN 1024
#endif
- char buf[RUBY_MAX_HOST_NAME_LEN+1];
+ long len = RUBY_MAX_HOST_NAME_LEN;
+ VALUE name;
- if (gethostname(buf, (int)sizeof buf - 1) < 0)
- rb_sys_fail("gethostname(3)");
-
- buf[sizeof buf - 1] = '\0';
- return rb_str_new2(buf);
+ name = rb_str_new(0, len);
+ while (gethostname(RSTRING_PTR(name), len) < 0) {
+ int e = errno;
+ switch (e) {
+ case ENAMETOOLONG:
+#ifdef __linux__
+ case EINVAL:
+ /* glibc before version 2.1 uses EINVAL instead of ENAMETOOLONG */
+#endif
+ break;
+ default:
+ rb_syserr_fail(e, "gethostname(3)");
+ }
+ rb_str_modify_expand(name, len);
+ len += len;
+ }
+ rb_str_resize(name, strlen(RSTRING_PTR(name)));
+ return name;
}
#else
#ifdef HAVE_UNAME