Signed-off-by: Mattias Andrée <[email protected]>
---
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
@@ -73,6 +73,7 @@ BIN = \
readahead \
respawn \
rmmod \
+ setsid \
stat \
su \
swaplabel \
@@ -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
@@ -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
@@ -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
