[hackers] [ubase][PATCH] Add setsid(1) from sbase with -c added

From: Mattias Andrée <maandree_AT_kth.se>
Date: Tue, 29 Mar 2016 20:39:37 +0200

Signed-off-by: Mattias Andrée <maandree_AT_kth.se>

---
 Makefile |  2 ++
 setsid.1 | 23 +++++++++++++++++++++++
 setsid.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 74 insertions(+)
 create mode 100644 setsid.1
 create mode 100644 setsid.c
diff --git a/Makefile b/Makefile
index 59616a4..9de7455 100644
--- a/Makefile
+++ b/Makefile
_AT_@ -73,6 +73,7 @@ BIN = \
 	readahead         \
 	respawn           \
 	rmmod             \
+	setsid            \
 	stat              \
 	su                \
 	swaplabel         \
_AT_@ -107,6 +108,7 @@ MAN1 = \
 	pidof.1             \
 	ps.1                \
 	respawn.1           \
+	setsid.1            \
 	stat.1              \
 	su.1                \
 	truncate.1          \
diff --git a/setsid.1 b/setsid.1
new file mode 100644
index 0000000..b343a60
--- /dev/null
+++ b/setsid.1
_AT_@ -0,0 +1,23 @@
+.Dd 2016-03-29
+.Dt SETSID 1
+.Os sbase
+.Sh NAME
+.Nm setsid
+.Nd run a command in a new session
+.Sh SYNOPSIS
+.Nm
+.Op Fl -c
+.Ar cmd
+.Op Ar arg ...
+.Sh DESCRIPTION
+.Nm
+runs
+.Ar cmd
+in a new session.
+.Sh OPTIONS
+.Bl -tag -width Ds
+.It Fl c
+Set the controlling terminal to stdin.
+.El
+.Sh SEE ALSO
+.Xr setsid 2
diff --git a/setsid.c b/setsid.c
new file mode 100644
index 0000000..c76b453
--- /dev/null
+++ b/setsid.c
_AT_@ -0,0 +1,49 @@
+/* See LICENSE file for copyright and license details. */
+#include <sys/ioctl.h>
+
+#include <errno.h>
+#include <unistd.h>
+
+#include "util.h"
+
+static void
+usage(void)
+{
+	eprintf("usage: %s cmd [-c] [arg ...]\n", argv0);
+}
+
+int
+main(int argc, char *argv[])
+{
+	int savederrno;
+	int cflag = 0;
+
+	ARGBEGIN {
+	case 'c':
+		cflag = 1;
+	default:
+		usage();
+	} ARGEND
+
+	if (getpgrp() == getpid()) {
+		switch (fork()) {
+		case -1:
+			eprintf("fork:");
+		case 0:
+			break;
+		default:
+			return 0;
+		}
+	}
+	if (setsid() < 0)
+		eprintf("setsid:");
+
+	if (cflag && ioctl(STDIN_FILENO, TIOCSCTTY, 1))
+		eprintf("TIOCSCTTY:");
+
+	execvp(argv[0], argv);
+	savederrno = errno;
+	weprintf("execvp %s:", argv[0]);
+
+	_exit(126 + (savederrno == ENOENT));
+}
-- 
2.7.4

Received on Tue Mar 29 2016 - 20:39:37 CEST