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-rw-r--r--lib/spawn.c84
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;
+}
+