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-rw-r--r--src/sd-readahead.c76
1 files changed, 76 insertions, 0 deletions
diff --git a/src/sd-readahead.c b/src/sd-readahead.c
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+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ Copyright 2010 Lennart Poettering
+
+ Permission is hereby granted, free of charge, to any person
+ obtaining a copy of this software and associated documentation files
+ (the "Software"), to deal in the Software without restriction,
+ including without limitation the rights to use, copy, modify, merge,
+ publish, distribute, sublicense, and/or sell copies of the Software,
+ and to permit persons to whom the Software is furnished to do so,
+ subject to the following conditions:
+
+ The above copyright notice and this permission notice shall be
+ included in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ SOFTWARE.
+***/
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <unistd.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <string.h>
+
+#include "sd-readahead.h"
+
+static int touch(const char *path) {
+
+#if !defined(DISABLE_SYSTEMD) && defined(__linux__)
+ int fd;
+
+ mkdir("/dev/.systemd", 0755);
+ mkdir("/dev/.systemd/readahead", 0755);
+
+ if ((fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, 0666)) < 0)
+ return -errno;
+
+ for (;;) {
+ if (close(fd) >= 0)
+ break;
+
+ if (errno != -EINTR)
+ return -errno;
+ }
+
+#endif
+ return 0;
+}
+
+int sd_readahead(const char *action) {
+
+ if (!action)
+ return -EINVAL;
+
+ if (strcmp(action, "cancel") == 0)
+ return touch("/dev/.systemd/readahead/cancel");
+ else if (strcmp(action, "done") == 0)
+ return touch("/dev/.systemd/readahead/done");
+ else if (strcmp(action, "noreplay") == 0)
+ return touch("/dev/.systemd/readahead/noreplay");
+
+ return -EINVAL;
+}