1 files changed, 84 insertions, 0 deletions
diff --git a/lib/spawn.c b/lib/spawn.c
new file mode 100644
index 0000000..d0b5fb2
--- /dev/null
+++ b/lib/spawn.c
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2011       , Jonathan Nieder
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the copyright holders or contributors may not be used to
+ *    endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include "exitcodes.h"
+#include "prototypes.h"
+
+int run_command (const char *cmd, const char *argv[],
+                 /*@null@*/const char *envp[], /*@out@*/int *status)
+{
+	pid_t pid, wpid;
+
+	if (NULL == envp) {
+		envp = (const char **)environ;
+	}
+
+	(void) fflush (stdout);
+	(void) fflush (stderr);
+
+	pid = fork ();
+	if (0 == pid) {
+		(void) execve (cmd, (char * const *) argv,
+		               (char * const *) envp);
+		if (ENOENT == errno) {
+			exit (E_CMD_NOTFOUND);
+		}
+		fprintf (stderr, "%s: cannot execute %s: %s\n",
+		         Prog, cmd, strerror (errno));
+		exit (E_CMD_NOEXEC);
+	} else if ((pid_t)-1 == pid) {
+		fprintf (stderr, "%s: cannot execute %s: %s\n",
+		         Prog, cmd, strerror (errno));
+		return -1;
+	}
+
+	do {
+		wpid = waitpid (pid, status, 0);
+		if ((pid_t)-1 == wpid && errno == ECHILD)
+			break;
+	} while (   ((pid_t)-1 == wpid && errno == EINTR)
+	         || ((pid_t)-1 != wpid && wpid != pid));
+
+	if ((pid_t)-1 == wpid) {
+		fprintf (stderr, "%s: waitpid (status: %d): %s\n",
+		         Prog, *status, strerror (errno));
+		return -1;
+	}
+
+	return 0;
+}
+