summaryrefslogtreecommitdiffstats
path: root/lib/util/pread.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:37:38 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:37:38 +0000
commitae581a19fbe896a797450b9d9573fb66f2735227 (patch)
tree56c40be8518a29c9351364d13a9676aa83932dc0 /lib/util/pread.c
parentInitial commit. (diff)
downloadsudo-ae581a19fbe896a797450b9d9573fb66f2735227.tar.xz
sudo-ae581a19fbe896a797450b9d9573fb66f2735227.zip
Adding upstream version 1.9.13p3.upstream/1.9.13p3upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--lib/util/pread.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/lib/util/pread.c b/lib/util/pread.c
new file mode 100644
index 0000000..9328c54
--- /dev/null
+++ b/lib/util/pread.c
@@ -0,0 +1,48 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2020 Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#include <errno.h>
+#include <unistd.h>
+
+#include "sudo_compat.h"
+
+#if !defined(HAVE_PREAD) && !defined(HAVE_PREAD64)
+ssize_t
+sudo_pread(int fd, void *buf, size_t nbytes, off_t offset)
+{
+ ssize_t nread;
+ off_t old_offset;
+
+ old_offset = lseek(fd, (off_t)0, SEEK_CUR);
+ if (old_offset == -1 || lseek(fd, offset, SEEK_SET) == -1)
+ return -1;
+
+ nread = read(fd, buf, nbytes);
+ if (lseek(fd, old_offset, SEEK_SET) == -1)
+ return -1;
+
+ return nread;
+}
+#endif /* !HAVE_PREAD && !HAVE_PREAD64 */