From: Dmitry V. Levin <ldv@altlinux.org>
Date: Mon, 25 Jan 2016 22:20:40 +0000 (+0000)
Subject: tests: add inode_of_sockfd function to libtests
X-Git-Tag: v4.12~612
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=e364920b67540cb98b56626f3a5de85bd3fd85b9;p=strace

tests: add inode_of_sockfd function to libtests

* tests/tests.h (inode_of_sockfd): New prototype.
* tests/inode_of_sockfd.c: New file.
* tests/Makefile.am (libtests_a_SOURCES): Add it.
---

diff --git a/tests/Makefile.am b/tests/Makefile.am
index e31be34e..7aa80093 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -44,6 +44,7 @@ libtests_a_SOURCES = \
 	error_msg.c \
 	get_page_size.c \
 	hexdump_strdup.c \
+	inode_of_sockfd.c \
 	tail_alloc.c \
 	tests.h \
 	tprintf.c \
diff --git a/tests/inode_of_sockfd.c b/tests/inode_of_sockfd.c
new file mode 100644
index 00000000..b227f306
--- /dev/null
+++ b/tests/inode_of_sockfd.c
@@ -0,0 +1,59 @@
+/*
+ * This file is part of strace test suite.
+ *
+ * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "tests.h"
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/param.h>
+
+unsigned long
+inode_of_sockfd(const int fd)
+{
+	assert(fd >= 0);
+
+	char linkpath[sizeof("/proc/self/fd/%u") + sizeof(int) * 3];
+	assert(snprintf(linkpath, sizeof(linkpath), "/proc/self/fd/%u", fd)
+	       < (int) sizeof(linkpath));
+
+	char path[PATH_MAX + 1];
+	const ssize_t path_len = readlink(linkpath, path, sizeof(path) - 1);
+	if (path_len < 0)
+		perror_msg_and_fail("readlink: %s", linkpath);
+	path[path_len] = '\0';
+
+	static const char prefix[] = "socket:[";
+	const size_t prefix_len = sizeof(prefix) - 1;
+	assert(strncmp(path, prefix, prefix_len) == 0
+	       && path[path_len - 1] == ']');
+
+	return strtoul(path + prefix_len, NULL, 10);
+}
diff --git a/tests/tests.h b/tests/tests.h
index 513aa10c..37db2ebf 100644
--- a/tests/tests.h
+++ b/tests/tests.h
@@ -69,6 +69,9 @@ void tprintf(const char *, ...)
 /* Make a hexdump copy of C string */
 const char *hexdump_strdup(const char *);
 
+/* Return inode number of socket descriptor. */
+unsigned long inode_of_sockfd(int);
+
 # define ARRAY_SIZE(arg) ((unsigned int) (sizeof(arg) / sizeof((arg)[0])))
 # define LENGTH_OF(arg) ((unsigned int) sizeof(arg) - 1)