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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 06:17:24 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 06:17:24 +0000
commit9d8085074991d5c0a42d6fc96a2d1a3ee918aad1 (patch)
treec85bca1e6c11eb872edfc64c524d20f2b7e3307b /examples/loadables/setpgid.c
parentInitial commit. (diff)
downloadbash-9d8085074991d5c0a42d6fc96a2d1a3ee918aad1.tar.xz
bash-9d8085074991d5c0a42d6fc96a2d1a3ee918aad1.zip
Adding upstream version 5.1.upstream/5.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'examples/loadables/setpgid.c')
-rw-r--r--examples/loadables/setpgid.c121
1 files changed, 121 insertions, 0 deletions
diff --git a/examples/loadables/setpgid.c b/examples/loadables/setpgid.c
new file mode 100644
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+/* 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
+};