From 5d7ea6cf9d666e9a9260bda3d1029680fcf1d2ec Mon Sep 17 00:00:00 2001
From: Christopher Allen Wing <wingc@engin.umich.edu>
Date: Sun, 24 Apr 2005 15:27:52 +0000
Subject: [PATCH] STABLE14-use-daemon-in-bosserver-and-afsd-20050424

provide daemon() if none exists. call it in bosserver and in afsd for afsdb handler

====================
This delta was composed from multiple commits as part of the CVS->Git migration.
The checkin message with each commit was inconsistent.
The following are the additional commit messages.
====================

add the file, too


(cherry picked from commit 21610a43f7bd4a0f1df1c1184308c04b26d77785)
---
 acinclude.m4                  |  1 +
 src/afsd/afsd.c               |  8 +++++
 src/bozo/bosserver.c          |  8 +++--
 src/util/Makefile.in          |  6 +++-
 src/util/afsutil_prototypes.h |  5 ++++
 src/util/daemon.c             | 56 +++++++++++++++++++++++++++++++++++
 6 files changed, 81 insertions(+), 3 deletions(-)
 create mode 100644 src/util/daemon.c

diff --git a/acinclude.m4 b/acinclude.m4
index 66de01836..84484bcea 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -1008,6 +1008,7 @@ AC_CHECK_TYPE(ssize_t, int)
 AC_SIZEOF_TYPE(long)
 
 AC_CHECK_FUNCS(timegm)
+AC_CHECK_FUNCS(daemon)
 
 dnl Directory PATH handling
 if test "x$enable_transarc_paths" = "xyes"  ; then 
diff --git a/src/afsd/afsd.c b/src/afsd/afsd.c
index 44d4f212d..13e91f042 100644
--- a/src/afsd/afsd.c
+++ b/src/afsd/afsd.c
@@ -1761,6 +1761,14 @@ mainproc(as, arock)
 	    printf("%s: Forking AFSDB lookup handler.\n", rn);
 	code = fork();
 	if (code == 0) {
+	    /* Since the AFSDB lookup handler runs as a user process, 
+	     * need to drop the controlling TTY, etc.
+	     */
+	    if (daemon(0, 0) == -1) {
+		printf("Error starting AFSDB lookup handler: %s\n",
+			strerror(errno));
+		exit(1);
+	    }
 	    AfsdbLookupHandler();
 	    exit(1);
 	}
diff --git a/src/bozo/bosserver.c b/src/bozo/bosserver.c
index c5bbf8b11..15f3343c6 100644
--- a/src/bozo/bosserver.c
+++ b/src/bozo/bosserver.c
@@ -580,6 +580,7 @@ tweak_config()
 }
 #endif
 
+#if 0
 /*
  * This routine causes the calling process to go into the background and
  * to lose its controlling tty.
@@ -701,6 +702,7 @@ background(void)
     }
 }
 #endif /* ! AFS_NT40_ENV */
+#endif
 
 /* start a process and monitor it */
 
@@ -857,11 +859,13 @@ main(int argc, char **argv, char **envp)
     fflush(stdout);
 #endif
 
-    /* go into the background and remove our controlling tty */
+    /* go into the background and remove our controlling tty, close open 
+       file desriptors
+     */
 
 #ifndef AFS_NT40_ENV
     if (!nofork)
-	background();
+	daemon(0, 0);
 #endif /* ! AFS_NT40_ENV */
 
     if ((!DoSyslog)
diff --git a/src/util/Makefile.in b/src/util/Makefile.in
index 58ca05e0a..d4f3a58b7 100644
--- a/src/util/Makefile.in
+++ b/src/util/Makefile.in
@@ -13,7 +13,8 @@ HELPER_SPLINT=@HELPER_SPLINT@
 objects = assert.o base64.o casestrcpy.o ktime.o volparse.o hostparse.o \
 	 hputil.o kreltime.o isathing.o get_krbrlm.o uuid.o serverLog.o \
 	 dirpath.o fileutil.o netutils.o flipbase64.o \
-	 afs_atomlist.o afs_lhash.o snprintf.o strlcat.o strlcpy.o ${REGEX_OBJ}
+	 afs_atomlist.o afs_lhash.o snprintf.o strlcat.o strlcpy.o \
+	 daemon.o ${REGEX_OBJ}
 
 includes = \
 	${TOP_INCDIR}/afs/dirpath.h \
@@ -130,6 +131,9 @@ strlcat.o: ${srcdir}/strlcat.c ${includes}
 strlcpy.o: ${srcdir}/strlcpy.c ${includes}
 	${CCOBJ} ${CFLAGS} -c ${srcdir}/strlcpy.c
 
+daemon.o: ${srcdir}/daemon.c ${includes}
+	${CCOBJ} ${CFLAGS} -c ${srcdir}/daemon.c
+
 #
 # Install targets
 #
diff --git a/src/util/afsutil_prototypes.h b/src/util/afsutil_prototypes.h
index 76f2cfd8c..89f5b71c0 100644
--- a/src/util/afsutil_prototypes.h
+++ b/src/util/afsutil_prototypes.h
@@ -33,6 +33,11 @@ extern char *lcstring(char *d, char *s, int n);
 extern char *ucstring(char *d, char *s, int n);
 extern char *strcompose(char *buf, size_t len, ...);
 
+/* daemon.c */
+#ifndef HAVE_DAEMON
+int daemon(int nochdir, int noclose);
+#endif
+
 /* dirpath.c */
 extern unsigned int initAFSDirPath(void);
 extern const char *getDirPath(afsdir_id_t string_id);
diff --git a/src/util/daemon.c b/src/util/daemon.c
new file mode 100644
index 000000000..e08845cf8
--- /dev/null
+++ b/src/util/daemon.c
@@ -0,0 +1,56 @@
+#include <afsconfig.h>
+#include <afs/param.h>
+
+#ifndef HAVE_DAEMON
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+
+int daemon(int nochdir, int noclose)
+{
+	int err = -1;
+	pid_t pid;
+
+	pid = fork();
+	if (pid == -1) {
+		goto out;
+	} else if (pid) {
+		exit(0);
+	}
+
+	err = setsid();
+	if (err == -1) {
+		goto out;
+	}
+
+	if (!nochdir) {
+		err = chdir("/");
+		if (err == -1) {
+			goto out;
+		}
+	}
+
+	err = -1;
+	if (!noclose) {
+		if (!freopen("/dev/null", "r", stdin)) {
+			goto out;
+		}
+
+		if (!freopen("/dev/null", "w", stdout)) {
+			goto out;
+		}
+
+		if (!freopen("/dev/null", "w", stderr)) {
+			goto out;
+		}
+	}
+
+	err = 0;
+
+out:
+	return(err);
+}
+#endif
-- 
2.39.5