1 files changed, 121 insertions, 0 deletions
diff --git a/examples/loadables/setpgid.c b/examples/loadables/setpgid.c
new file mode 100644
index 0000000..e56fd51
--- /dev/null
+++ b/examples/loadables/setpgid.c
@@ -0,0 +1,121 @@
+/* setpgid.c: bash loadable wrapper for setpgid system call
+
+   An example of how to wrap a system call with a loadable builtin.
+
+   Originally contributed by Jason Vas Dias <jason.vas.dias@gmail.com>
+   
+   Bash 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 3 of the License, or
+   (at your option) any later version.
+
+   Bash 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 Bash.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <config.h>
+
+#if defined (HAVE_UNISTD_H)
+#  include <unistd.h>
+#endif
+#include <errno.h>
+#include <string.h>
+
+#include "bashtypes.h"
+#include "posixtime.h"
+
+#include <stdio.h>
+
+#include "builtins.h"
+#include "shell.h"
+#include "common.h"
+
+#include "bashgetopt.h"
+
+#if !defined (_POSIX_VERSION)
+#  define setpgid(pid, pgrp)      setpgrp (pid, pgrp)
+#endif
+
+int
+setpgid_builtin (list)
+      WORD_LIST *list;
+{
+  register WORD_LIST *wl;
+  intmax_t pid_arg, pgid_arg;
+  pid_t pid, pgid;
+  char *pidstr, *pgidstr;
+
+  wl = list;
+  pid = pgid = 0;
+
+  if (wl == 0 || wl->next == 0)
+    {
+      builtin_usage ();
+      return (EX_USAGE);
+    }
+
+  pidstr = wl->word ? wl->word->word : 0;
+  pgidstr = wl->next->word ? wl->next->word->word : 0;
+
+  if (pidstr == 0 || pgidstr == 0)
+    {
+      builtin_usage ();
+      return (EX_USAGE);
+    }
+      
+  if (legal_number (pidstr, &pid_arg) == 0)
+    {
+      builtin_error ("%s: pid argument must be numeric", pidstr);
+      return (EXECUTION_FAILURE);
+    }
+  if (pid_arg < 0)
+    {
+      builtin_error("%s: negative pid  values not allowed", pidstr);
+      return (EXECUTION_FAILURE);
+    }
+  pid = pid_arg;
+
+  if (legal_number (pgidstr, &pgid_arg) == 0)
+    {
+      builtin_error ("%s: pgrp argument must be numeric", pgidstr);
+      return (EXECUTION_FAILURE);
+    }
+  if (pgid_arg < 0)
+    {
+      builtin_error ("%s: negative pgrp values not allowed", pgidstr);
+      return (EXECUTION_FAILURE);
+    }
+  pgid = pgid_arg;
+
+  errno = 0;
+  if (setpgid(pid, pgid) < 0)
+    {
+      builtin_error("setpgid failed: %s", strerror (errno));
+      return (EXECUTION_FAILURE);     
+    }
+  return (EXECUTION_SUCCESS);     
+}
+
+const char *setpgid_doc[] = {
+	"invoke the setpgid(2) system call",
+	"",
+	"Arguments:",
+	"   pid : numeric process identifier, >= 0",
+	"   pgrpid: numeric process group identifier, >=0",
+	"See the setpgid(2) manual page.",
+	(const char *)NULL
+};
+
+struct builtin setpgid_struct = {
+	"setpgid",
+	setpgid_builtin,
+	BUILTIN_ENABLED,
+	(char **)setpgid_doc,
+	"setpgid pid pgrpid",
+	0
+};