Add process handling related files

1 files changed, 123 insertions, 0 deletions

diff --git a/transfer/process.c b/transfer/process.c
new file mode 100644
index 00000000..39145f42
--- /dev/null
+++ b/transfer/process.c
@@ -0,0 +1,123 @@
+/*
+ *
+ *  BlueZ - Bluetooth protocol stack for Linux
+ *
+ *  Copyright (C) 2006-2007  Marcel Holtmann <marcel@holtmann.org>
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/wait.h>
+
+#include <glib.h>
+
+#include "logging.h"
+#include "process.h"
+
+static void child_exit(GPid pid, gint status, gpointer data)
+{
+	debug("Child with PID %d exits with status %d", pid, status);
+
+	debug("Exit status %d", WEXITSTATUS(status));
+}
+
+int create_reader(uid_t uid, const char *pathname,
+					GIOFunc func, gpointer user_data)
+{
+	pid_t pid;
+	unsigned char buf[512];
+	int fd, pfd[2], len, written;
+
+	if (pipe(pfd) < 0) {
+		error("Failed to create new pipe");
+		return -1;
+	}
+
+	pid = fork();
+	if (pid < 0) {
+		error("Failed to fork new process");
+		close(pfd[0]);
+		close(pfd[1]);
+		return -1;
+	}
+
+	if (pid > 0) {
+		GIOChannel *io;
+
+		g_child_watch_add(pid, child_exit, NULL);
+
+		close(pfd[1]);
+
+		io = g_io_channel_unix_new(pfd[0]);
+		g_io_channel_set_close_on_unref(io, TRUE);
+
+		g_io_add_watch(io, G_IO_IN, func, user_data);
+
+		g_io_channel_unref(io);
+
+		return 0;
+	}
+
+	/* Child process */
+
+	close(pfd[0]);
+
+	if (setuid(uid) < 0) {
+		error("Failed to switch to UID %d", uid);
+		close(pfd[1]);
+		exit(EXIT_FAILURE);
+	}
+
+	fd = open(pathname, O_RDONLY);
+	if (fd < 0) {
+		error("Failed to open file %s: %s",
+					pathname, strerror(errno));
+		close(pfd[1]);
+		exit(EXIT_FAILURE);
+	}
+
+	while (1) {
+		len = read(fd, buf, sizeof(buf));
+		if (len <= 0) {
+			debug("Reading failed");
+			break;
+		}
+
+		written = write(pfd[1], buf, len);
+		if (written < len) {
+			debug("Writing failed");
+			break;
+		}
+	}
+
+	debug("Reader finished");
+
+	close(fd);
+
+	close(pfd[1]);
+
+	exit(EXIT_SUCCESS);
+}