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-rw-r--r--src/start-stop-daemon/pipes.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/src/start-stop-daemon/pipes.c b/src/start-stop-daemon/pipes.c
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--- /dev/null
+++ b/src/start-stop-daemon/pipes.c
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+/*
+ * pipes.c
+ * Helper to handle spawning processes and connecting them to pipes.
+ */
+
+/*
+ * Copyright (c) 2018 The OpenRC Authors.
+ * See the Authors file at the top-level directory of this distribution and
+ * https://github.com/OpenRC/openrc/blob/HEAD/AUTHORS
+ *
+ * This file is part of OpenRC. It is subject to the license terms in
+ * the LICENSE file found in the top-level directory of this
+ * distribution and at https://github.com/OpenRC/openrc/blob/HEAD/LICENSE
+ * This file may not be copied, modified, propagated, or distributed
+ * except according to the terms contained in the LICENSE file.
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+
+#include "pipes.h"
+
+static const int pipe_read_end = 0;
+static const int pipe_write_end = 1;
+
+/*
+ * Starts a command with stdin redirected from a pipe
+ * Returns the write end of the pipe or -1
+ */
+int rc_pipe_command(char *cmd)
+{
+ int pfd[2];
+ pid_t pid;
+
+ if (pipe(pfd) < 0)
+ return -1;
+
+ pid = fork();
+ if (pid > 0) {
+ /* parent */
+ close(pfd[pipe_read_end]);
+ return pfd[pipe_write_end];
+ } else if (pid == 0) {
+ /* child */
+ close(pfd[pipe_write_end]);
+ if (pfd[pipe_read_end] != STDIN_FILENO) {
+ if (dup2(pfd[pipe_read_end], STDIN_FILENO) < 0)
+ exit(1);
+ close(pfd[pipe_read_end]);
+ }
+ execl("/bin/sh", "sh", "-c", cmd, NULL);
+ exit(1);
+ }
+ return -1;
+}