ioops: Add {read,write}_blob_or_die for reading/writing binary blobs

We need those functions for later key generation simplification.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>

2 files changed, 25 insertions, 0 deletions

diff --git a/ioops.c b/ioops.c
index 6e79317..a5dc94a 100644
--- a/ioops.c
+++ b/ioops.c
@@ -96,3 +96,26 @@ ssize_t write_or_die(int fd, const void *buf, size_t len)
 
 	return ret;
 }
+
+int read_blob_or_die(const char *file, void *blob, size_t count)
+{
+	int fd, ret;
+
+	fd = open_or_die(file, O_RDONLY);
+	ret = read_or_die(fd, blob, len);
+	close(fd);
+
+	return ret;
+}
+
+int write_blob_or_die(const char *file, const void *blob, size_t count)
+{
+	int fd, ret;
+
+	fd = open_or_die_m(file, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
+	ret = write_or_die(fd, blob, len);
+	fdatasync(fd);
+	close(fd);
+
+	return ret;
+}
diff --git a/ioops.h b/ioops.h
index eed3e3d..a344361 100644
--- a/ioops.h
+++ b/ioops.h
@@ -8,5 +8,7 @@ extern int tun_open_or_die(char *name, int type);
 extern void pipe_or_die(int pipefd[2], int flags);
 extern ssize_t read_or_die(int fd, void *buf, size_t count);
 extern ssize_t write_or_die(int fd, const void *buf, size_t count);
+extern int read_blob_or_die(const char *file, void *blob, size_t count);
+extern int write_blob_or_die(const char *file, const void *blob, size_t count);
 
 #endif /* IOOPS_H */