3 files changed, 259 insertions, 0 deletions
diff --git a/usr.bin/nohup/Makefile b/usr.bin/nohup/Makefile
new file mode 100644
index 0000000..5ec4057
--- /dev/null
+++ b/usr.bin/nohup/Makefile
@@ -0,0 +1,6 @@
+#	@(#)Makefile	8.1 (Berkeley) 6/6/93
+# $FreeBSD$
+
+PROG=	nohup
+
+.include <bsd.prog.mk>
diff --git a/usr.bin/nohup/nohup.1 b/usr.bin/nohup/nohup.1
new file mode 100644
index 0000000..257c1d1
--- /dev/null
+++ b/usr.bin/nohup/nohup.1
@@ -0,0 +1,120 @@
+.\" Copyright (c) 1989, 1990, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" the Institute of Electrical and Electronics Engineers, Inc.
+.\"
+.\" 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.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+.\"
+.\"	@(#)nohup.1	8.1 (Berkeley) 6/6/93
+.\" $FreeBSD$
+.\"
+.Dd July 19, 2001
+.Dt NOHUP 1
+.Os
+.Sh NAME
+.Nm nohup
+.Nd invoke a utility immune to hangups
+.Sh SYNOPSIS
+.Nm
+.Op Fl Fl
+.Ar utility
+.Op Ar arguments
+.Sh DESCRIPTION
+The
+.Nm
+utility invokes
+.Ar utility
+with its
+.Ar arguments
+and at this time sets the signal
+.Dv SIGHUP
+to be ignored.
+If the standard output is a terminal, the standard output is
+appended to the file
+.Pa nohup.out
+in the current directory.
+If standard error is a terminal, it is directed to the same place
+as the standard output.
+.Pp
+Some shells may provide a builtin
+.Nm
+command which is similar or identical to this utility.
+Consult the
+.Xr builtin 1
+manual page.
+.Sh ENVIRONMENT
+The following variables are utilized by
+.Nm :
+.Bl -tag -width flag
+.It Ev HOME
+If the output file
+.Pa nohup.out
+cannot be created in the current directory, the
+.Nm
+utility uses the directory named by
+.Ev HOME
+to create the file.
+.It Ev PATH
+Used to locate the requested
+.Ar utility
+if the name contains no
+.Ql /
+characters.
+.El
+.Sh EXIT STATUS
+The
+.Nm
+utility exits with one of the following values:
+.Bl -tag -width Ds
+.It 126
+The
+.Ar utility
+was found, but could not be invoked.
+.It 127
+The
+.Ar utility
+could not be found or an error occurred in
+.Nm .
+.El
+.Pp
+Otherwise, the exit status of
+.Nm
+will be that of
+.Ar utility .
+.Sh SEE ALSO
+.Xr builtin 1 ,
+.Xr csh 1 ,
+.Xr signal 3
+.Sh STANDARDS
+The
+.Nm
+utility is expected to be
+.St -p1003.2
+compatible.
+.Sh BUGS
+Two or more instances of
+.Nm
+can append to the same file, which makes for a confusing output.
diff --git a/usr.bin/nohup/nohup.c b/usr.bin/nohup/nohup.c
new file mode 100644
index 0000000..beb1a35
--- /dev/null
+++ b/usr.bin/nohup/nohup.c
@@ -0,0 +1,133 @@
+/*
+ * Copyright (c) 1989, 1993
+ *	The Regents of the University of California.  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.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+ */
+
+#if 0
+#ifndef lint
+static const char copyright[] =
+"@(#) Copyright (c) 1989, 1993\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)nohup.c	8.1 (Berkeley) 6/6/93";
+#endif /* not lint */
+#endif
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/stat.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+static void dofile(void);
+static void usage(void);
+
+#define	FILENAME	"nohup.out"
+/*
+ * POSIX mandates that we exit with:
+ * 126 - If the utility was found, but failed to execute.
+ * 127 - If any other error occurred. 
+ */
+#define	EXIT_NOEXEC	126
+#define	EXIT_NOTFOUND	127
+#define	EXIT_MISC	127
+
+int
+main(int argc, char *argv[])
+{
+	int exit_status;
+
+	while (getopt(argc, argv, "") != -1)
+		usage();
+	argc -= optind;
+	argv += optind;
+	if (argc < 1)
+		usage();
+
+	if (isatty(STDOUT_FILENO))
+		dofile();
+	if (isatty(STDERR_FILENO) && dup2(STDOUT_FILENO, STDERR_FILENO) == -1)
+		/* may have just closed stderr */
+		err(EXIT_MISC, "%s", argv[0]);
+
+	(void)signal(SIGHUP, SIG_IGN);
+
+	execvp(*argv, argv);
+	exit_status = (errno == ENOENT) ? EXIT_NOTFOUND : EXIT_NOEXEC;
+	err(exit_status, "%s", argv[0]);
+}
+
+static void
+dofile(void)
+{
+	int fd;
+	char path[MAXPATHLEN];
+	const char *p;
+
+	/*
+	 * POSIX mandates if the standard output is a terminal, the standard
+	 * output is appended to nohup.out in the working directory.  Failing
+	 * that, it will be appended to nohup.out in the directory obtained
+	 * from the HOME environment variable.  If file creation is required,
+	 * the mode_t is set to S_IRUSR | S_IWUSR.
+	 */
+	p = FILENAME;
+	fd = open(p, O_RDWR | O_CREAT | O_APPEND, S_IRUSR | S_IWUSR);
+	if (fd != -1)
+		goto dupit;
+	if ((p = getenv("HOME")) != NULL && *p != '\0' &&
+	    (size_t)snprintf(path, sizeof(path), "%s/%s", p, FILENAME) <
+	    sizeof(path)) {
+		fd = open(p = path, O_RDWR | O_CREAT | O_APPEND,
+		    S_IRUSR | S_IWUSR);
+		if (fd != -1)
+			goto dupit;
+	}
+	errx(EXIT_MISC, "can't open a nohup.out file");
+
+dupit:
+	if (dup2(fd, STDOUT_FILENO) == -1)
+		err(EXIT_MISC, NULL);
+	(void)fprintf(stderr, "appending output to %s\n", p);
+}
+
+static void
+usage(void)
+{
+	(void)fprintf(stderr, "usage: nohup [--] utility [arguments]\n");
+	exit(EXIT_MISC);
+}