From ae850b1ac755f471beac4dbfef4654fe3fbaaae9 Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Tue, 9 Jan 2024 22:04:24 +0100 Subject: First commit MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- libpatch_is_devnull.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 libpatch_is_devnull.c (limited to 'libpatch_is_devnull.c') diff --git a/libpatch_is_devnull.c b/libpatch_is_devnull.c new file mode 100644 index 0000000..3a78ea6 --- /dev/null +++ b/libpatch_is_devnull.c @@ -0,0 +1,24 @@ +/* See LICENSE file for copyright and license details. */ +#include "common.h" +#include + + +int +libpatch_is_devnull(int fd) +{ + struct stat fd_st; +#ifndef __linux__ + struct stat null_st; +#endif + if (fstat(fd, &fd_st)) + return -1; + if (!S_ISCHR(fd_st.st_mode)) + return 0; +#ifdef __linux__ + return fd_st.st_rdev == makedev(1, 3); +#else + if (stat("/dev/null", &null_st)) + return -1; + return fd_st.st_rdev == null_st.st_rdev; +#endif +} -- cgit v1.2.3-70-g09d2