--- /dev/null
+/*
+ * Check decoding and dumping of read and write syscalls.
+ *
+ * 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 <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+static void
+dump_str(const char *str, const unsigned int len)
+{
+ static const char dots[16] = "................";
+ unsigned int i;
+
+ for (i = 0; i < len; i += 16) {
+ unsigned int n = len - i > 16 ? 16 : len - i;
+ const char *dump = hexdump_memdup(str + i, n);
+
+ tprintf(" | %05x %-49s %-16.*s |\n",
+ i, dump, n, dots);
+
+ free((void *) dump);
+ }
+}
+
+static void
+print_hex(const char *str, const unsigned int len)
+{
+ const unsigned char *ustr = (const unsigned char *) str;
+ unsigned int i;
+
+ for (i = 0; i < len; ++i) {
+ unsigned int c = ustr[i];
+
+ switch (c) {
+ case '\t':
+ tprintf("\\t"); break;
+ case '\n':
+ tprintf("\\n"); break;
+ case '\v':
+ tprintf("\\v"); break;
+ case '\f':
+ tprintf("\\f"); break;
+ case '\r':
+ tprintf("\\r"); break;
+ default:
+ tprintf("\\%o", ustr[i]);
+ }
+ }
+}
+
+static void
+test_dump(const unsigned int len)
+{
+ static char *buf;
+
+ if (buf) {
+ size_t ps1 = get_page_size() - 1;
+ buf = (void *) (((size_t) buf + ps1) & ~ps1) - len;
+ } else {
+ buf = tail_alloc(len);
+ }
+
+ long rc = read(0, buf, len);
+ if (rc != (int) len)
+ perror_msg_and_fail("read: expected %d, returned %ld",
+ len, rc);
+
+ tprintf("%s(%d, \"", "read", 0);
+ print_hex(buf, len);
+ tprintf("\", %d) = %ld\n", len, rc);
+ dump_str(buf, len);
+
+ unsigned int i;
+ for (i = 0; i < len; ++i)
+ buf[i] = i;
+
+ rc = write(1, buf, len);
+ if (rc != (int) len)
+ perror_msg_and_fail("write: expected %d, returned %ld",
+ len, rc);
+
+ tprintf("%s(%d, \"", "write", 1);
+ print_hex(buf, len);
+ tprintf("\", %d) = %ld\n", len, rc);
+ dump_str(buf, len);
+
+ if (!len)
+ buf = 0;
+}
+
+int
+main(void)
+{
+ tprintf("%s", "");
+
+ static char tmp[] = "read-write-tmpfile";
+ if (open(tmp, O_CREAT|O_RDONLY|O_TRUNC, 0600) != 0)
+ perror_msg_and_fail("creat: %s", tmp);
+ if (open(tmp, O_WRONLY) != 1)
+ perror_msg_and_fail("open: %s", tmp);
+
+ static const char w_c[] = "0123456789abcde";
+ const unsigned int w_len = LENGTH_OF(w_c);
+ const char *w_d = hexdump_strdup(w_c);
+ const void *w = tail_memdup(w_c, w_len);
+
+ static const char r0_c[] = "01234567";
+ const char *r0_d = hexdump_strdup(r0_c);
+ const unsigned int r0_len = (w_len + 1) / 2;
+ void *r0 = tail_alloc(r0_len);
+
+ static const char r1_c[] = "89abcde";
+ const char *r1_d = hexdump_strdup(r1_c);
+ const unsigned int r1_len = w_len - r0_len;
+ void *r1 = tail_alloc(w_len);
+
+ void *efault = r1 - get_page_size();
+
+ long rc;
+
+ rc = write(1, w, 0);
+ if (rc)
+ perror_msg_and_fail("write: expected 0, returned %ld", rc);
+ tprintf("write(1, \"\", 0) = 0\n");
+
+ rc = write(1, w, w_len + 1);
+ if (rc != -1)
+ perror_msg_and_fail("write: expected -1 EFAULT"
+ ", returned %ld", rc);
+ tprintf("write(1, %p, %u) = -1 EFAULT (%m)\n",
+ w, w_len + 1);
+
+ rc = write(1, w, w_len);
+ if (rc != (int) w_len)
+ perror_msg_and_fail("write: expected %u, returned %ld",
+ w_len, rc);
+ tprintf("write(1, \"%s\", %u) = %ld\n"
+ " | 00000 %-49s %-16s |\n",
+ w_c, w_len, rc, w_d, w_c);
+ close(1);
+
+ rc = read(0, r0, 0);
+ if (rc)
+ perror_msg_and_fail("read: expected 0, returned %ld", rc);
+ tprintf("read(0, \"\", 0) = 0\n");
+
+ rc = read(0, efault, 1);
+ if (rc != -1)
+ perror_msg_and_fail("read: expected -1, returned %ld", rc);
+ tprintf("read(0, %p, 1) = -1 EFAULT (%m)\n", efault);
+
+ rc = read(0, r0, r0_len);
+ if (rc != (int) r0_len)
+ perror_msg_and_fail("read: expected %u, returned %ld",
+ r0_len, rc);
+ tprintf("read(0, \"%s\", %u) = %ld\n"
+ " | 00000 %-49s %-16s |\n",
+ r0_c, r0_len, rc, r0_d, r0_c);
+
+ rc = read(0, r1, w_len);
+ if (rc != (int) r1_len)
+ perror_msg_and_fail("read: expected %u, returned %ld",
+ r1_len, rc);
+ tprintf("read(0, \"%s\", %u) = %ld\n"
+ " | 00000 %-49s %-16s |\n",
+ r1_c, w_len, rc, r1_d, r1_c);
+ close(0);
+
+ if (open("/dev/zero", O_RDONLY))
+ perror_msg_and_fail("open");
+
+ if (open("/dev/null", O_WRONLY) != 1)
+ perror_msg_and_fail("open");
+
+ unsigned int i;
+ for (i = 0; i <= 32; ++i)
+ test_dump(i);
+
+ tprintf("+++ exited with 0 +++\n");
+ return 0;
+}
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