Import public domain setsid from sysutils/setsid

6 files changed, 703 insertions, 6 deletions

diff --git a/.gitignore b/.gitignore
index 5fa1e524..1fa154df 100644
--- a/.gitignore
+++ b/.gitignore
@@ -31,6 +31,7 @@ libtool
 /rename
 /rexec
 /rm
+/setsid
 /sh
 /timeout
 /timestamp
diff --git a/Makefile.am b/Makefile.am
index 0b6fc5bb..5cb877df 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -160,6 +160,7 @@ pkglibexec_PROGRAMS= \
 		     rename \
 		     rexec \
 		     @USE_RM@ \
+		     setsid \
 		     timeout \
 		     timestamp \
 		     @SH@
@@ -190,6 +191,9 @@ nc_SOURCES=		src/libexec/poudriere/nc/nc.c
 pwait_SOURCES=		src/libexec/poudriere/pwait/pwait.c
 rename_SOURCES=		src/libexec/poudriere/rename/rename.c
 rm_SOURCES=		src/libexec/poudriere/rm/rm.c
+setsid_SOURCES=		src/libexec/poudriere/setsid/setsid.c \
+			set/libexec/poudriere/setsid/c.h
+setsid_CFLAGS=		-DHAVE_ERR_H -DHAVE_NANOSLEEP
 timeout_SOURCES=	src/libexec/poudriere/timeout/timeout.c
 timestamp_SOURCES=	src/libexec/poudriere/timestamp/timestamp.c
 timestamp_LDADD=	-lpthread
diff --git a/Makefile.in b/Makefile.in
index bffaf318..52ca0c82 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -97,8 +97,8 @@ pkglibexec_PROGRAMS = cachec$(EXEEXT) cached$(EXEEXT) clock$(EXEEXT) \
 	cpdup$(EXEEXT) dirempty$(EXEEXT) dirwatch$(EXEEXT) \
 	jexecd$(EXEEXT) locked_mkdir$(EXEEXT) nc$(EXEEXT) \
 	poudriered$(EXEEXT) ptsort$(EXEEXT) pwait$(EXEEXT) \
-	rename$(EXEEXT) rexec$(EXEEXT) @USE_RM@ timeout$(EXEEXT) \
-	timestamp$(EXEEXT) @SH@
+	rename$(EXEEXT) rexec$(EXEEXT) @USE_RM@ setsid$(EXEEXT) \
+	timeout$(EXEEXT) timestamp$(EXEEXT) @SH@
 EXTRA_PROGRAMS = rm$(EXEEXT) sh$(EXEEXT)
 subdir = .
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
@@ -234,6 +234,13 @@ rexec_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
 am_rm_OBJECTS = src/libexec/poudriere/rm/rm.$(OBJEXT)
 rm_OBJECTS = $(am_rm_OBJECTS)
 rm_LDADD = $(LDADD)
+am_setsid_OBJECTS =  \
+	src/libexec/poudriere/setsid/setsid-setsid.$(OBJEXT)
+setsid_OBJECTS = $(am_setsid_OBJECTS)
+setsid_LDADD = $(LDADD)
+setsid_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
+	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(setsid_CFLAGS) $(CFLAGS) \
+	$(AM_LDFLAGS) $(LDFLAGS) -o $@
 am_sh_OBJECTS = external/sh/sh-alias.$(OBJEXT) \
 	external/sh/sh-arith_yacc.$(OBJEXT) \
 	external/sh/sh-arith_yylex.$(OBJEXT) \
@@ -402,6 +409,7 @@ am__depfiles_remade = external/libnv/$(DEPDIR)/libnv_la-msgio.Plo \
 	src/libexec/poudriere/rexec/$(DEPDIR)/rexec-rexec.Po \
 	src/libexec/poudriere/rm/$(DEPDIR)/rm.Po \
 	src/libexec/poudriere/rm/$(DEPDIR)/sh-rm.Po \
+	src/libexec/poudriere/setsid/$(DEPDIR)/setsid-setsid.Po \
 	src/libexec/poudriere/timeout/$(DEPDIR)/timeout.Po \
 	src/libexec/poudriere/timestamp/$(DEPDIR)/timestamp.Po \
 	src/poudriere-sh/$(DEPDIR)/sh-builtins.Po \
@@ -444,16 +452,16 @@ SOURCES = $(libnv_la_SOURCES) $(libptsort_la_SOURCES) \
 	$(dirwatch_SOURCES) $(jexecd_SOURCES) $(locked_mkdir_SOURCES) \
 	$(nc_SOURCES) $(poudriered_SOURCES) $(ptsort_SOURCES) \
 	$(pwait_SOURCES) $(rename_SOURCES) $(rexec_SOURCES) \
-	$(rm_SOURCES) $(sh_SOURCES) $(timeout_SOURCES) \
-	$(timestamp_SOURCES)
+	$(rm_SOURCES) $(setsid_SOURCES) $(sh_SOURCES) \
+	$(timeout_SOURCES) $(timestamp_SOURCES)
 DIST_SOURCES = $(libnv_la_SOURCES) $(libptsort_la_SOURCES) \
 	$(libucl_la_SOURCES) $(cachec_SOURCES) $(cached_SOURCES) \
 	$(clock_SOURCES) $(cpdup_SOURCES) $(dirempty_SOURCES) \
 	$(dirwatch_SOURCES) $(jexecd_SOURCES) $(locked_mkdir_SOURCES) \
 	$(nc_SOURCES) $(poudriered_SOURCES) $(ptsort_SOURCES) \
 	$(pwait_SOURCES) $(rename_SOURCES) $(rexec_SOURCES) \
-	$(rm_SOURCES) $(sh_SOURCES) $(timeout_SOURCES) \
-	$(timestamp_SOURCES)
+	$(rm_SOURCES) $(setsid_SOURCES) $(sh_SOURCES) \
+	$(timeout_SOURCES) $(timestamp_SOURCES)
 RECURSIVE_TARGETS = all-recursive check-recursive cscopelist-recursive \
 	ctags-recursive dvi-recursive html-recursive info-recursive \
 	install-data-recursive install-dvi-recursive \
@@ -847,6 +855,10 @@ nc_SOURCES = src/libexec/poudriere/nc/nc.c
 pwait_SOURCES = src/libexec/poudriere/pwait/pwait.c
 rename_SOURCES = src/libexec/poudriere/rename/rename.c
 rm_SOURCES = src/libexec/poudriere/rm/rm.c
+setsid_SOURCES = src/libexec/poudriere/setsid/setsid.c \
+			set/libexec/poudriere/setsid/c.h
+
+setsid_CFLAGS = -DHAVE_ERR_H -DHAVE_NANOSLEEP
 timeout_SOURCES = src/libexec/poudriere/timeout/timeout.c
 timestamp_SOURCES = src/libexec/poudriere/timestamp/timestamp.c
 timestamp_LDADD = -lpthread
@@ -1372,6 +1384,19 @@ src/libexec/poudriere/rm/rm.$(OBJEXT):  \
 rm$(EXEEXT): $(rm_OBJECTS) $(rm_DEPENDENCIES) $(EXTRA_rm_DEPENDENCIES) 
 	@rm -f rm$(EXEEXT)
 	$(AM_V_CCLD)$(LINK) $(rm_OBJECTS) $(rm_LDADD) $(LIBS)
+src/libexec/poudriere/setsid/$(am__dirstamp):
+	@$(MKDIR_P) src/libexec/poudriere/setsid
+	@: > src/libexec/poudriere/setsid/$(am__dirstamp)
+src/libexec/poudriere/setsid/$(DEPDIR)/$(am__dirstamp):
+	@$(MKDIR_P) src/libexec/poudriere/setsid/$(DEPDIR)
+	@: > src/libexec/poudriere/setsid/$(DEPDIR)/$(am__dirstamp)
+src/libexec/poudriere/setsid/setsid-setsid.$(OBJEXT):  \
+	src/libexec/poudriere/setsid/$(am__dirstamp) \
+	src/libexec/poudriere/setsid/$(DEPDIR)/$(am__dirstamp)
+
+setsid$(EXEEXT): $(setsid_OBJECTS) $(setsid_DEPENDENCIES) $(EXTRA_setsid_DEPENDENCIES) 
+	@rm -f setsid$(EXEEXT)
+	$(AM_V_CCLD)$(setsid_LINK) $(setsid_OBJECTS) $(setsid_LDADD) $(LIBS)
 external/sh/$(am__dirstamp):
 	@$(MKDIR_P) external/sh
 	@: > external/sh/$(am__dirstamp)
@@ -1643,6 +1668,7 @@ mostlyclean-compile:
 	-rm -f src/libexec/poudriere/rename/*.$(OBJEXT)
 	-rm -f src/libexec/poudriere/rexec/*.$(OBJEXT)
 	-rm -f src/libexec/poudriere/rm/*.$(OBJEXT)
+	-rm -f src/libexec/poudriere/setsid/*.$(OBJEXT)
 	-rm -f src/libexec/poudriere/timeout/*.$(OBJEXT)
 	-rm -f src/libexec/poudriere/timestamp/*.$(OBJEXT)
 	-rm -f src/poudriere-sh/*.$(OBJEXT)
@@ -1719,6 +1745,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@src/libexec/poudriere/rexec/$(DEPDIR)/rexec-rexec.Po@am__quote@ # am--include-marker
 @AMDEP_TRUE@@am__include@ @am__quote@src/libexec/poudriere/rm/$(DEPDIR)/rm.Po@am__quote@ # am--include-marker
 @AMDEP_TRUE@@am__include@ @am__quote@src/libexec/poudriere/rm/$(DEPDIR)/sh-rm.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@src/libexec/poudriere/setsid/$(DEPDIR)/setsid-setsid.Po@am__quote@ # am--include-marker
 @AMDEP_TRUE@@am__include@ @am__quote@src/libexec/poudriere/timeout/$(DEPDIR)/timeout.Po@am__quote@ # am--include-marker
 @AMDEP_TRUE@@am__include@ @am__quote@src/libexec/poudriere/timestamp/$(DEPDIR)/timestamp.Po@am__quote@ # am--include-marker
 @AMDEP_TRUE@@am__include@ @am__quote@src/poudriere-sh/$(DEPDIR)/sh-builtins.Po@am__quote@ # am--include-marker
@@ -1998,6 +2025,20 @@ src/libexec/poudriere/rexec/rexec-rexec.obj: src/libexec/poudriere/rexec/rexec.c
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
 @am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(rexec_CFLAGS) $(CFLAGS) -c -o src/libexec/poudriere/rexec/rexec-rexec.obj `if test -f 'src/libexec/poudriere/rexec/rexec.c'; then $(CYGPATH_W) 'src/libexec/poudriere/rexec/rexec.c'; else $(CYGPATH_W) '$(srcdir)/src/libexec/poudriere/rexec/rexec.c'; fi`
 
+src/libexec/poudriere/setsid/setsid-setsid.o: src/libexec/poudriere/setsid/setsid.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(setsid_CFLAGS) $(CFLAGS) -MT src/libexec/poudriere/setsid/setsid-setsid.o -MD -MP -MF src/libexec/poudriere/setsid/$(DEPDIR)/setsid-setsid.Tpo -c -o src/libexec/poudriere/setsid/setsid-setsid.o `test -f 'src/libexec/poudriere/setsid/setsid.c' || echo '$(srcdir)/'`src/libexec/poudriere/setsid/setsid.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) src/libexec/poudriere/setsid/$(DEPDIR)/setsid-setsid.Tpo src/libexec/poudriere/setsid/$(DEPDIR)/setsid-setsid.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='src/libexec/poudriere/setsid/setsid.c' object='src/libexec/poudriere/setsid/setsid-setsid.o' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(setsid_CFLAGS) $(CFLAGS) -c -o src/libexec/poudriere/setsid/setsid-setsid.o `test -f 'src/libexec/poudriere/setsid/setsid.c' || echo '$(srcdir)/'`src/libexec/poudriere/setsid/setsid.c
+
+src/libexec/poudriere/setsid/setsid-setsid.obj: src/libexec/poudriere/setsid/setsid.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(setsid_CFLAGS) $(CFLAGS) -MT src/libexec/poudriere/setsid/setsid-setsid.obj -MD -MP -MF src/libexec/poudriere/setsid/$(DEPDIR)/setsid-setsid.Tpo -c -o src/libexec/poudriere/setsid/setsid-setsid.obj `if test -f 'src/libexec/poudriere/setsid/setsid.c'; then $(CYGPATH_W) 'src/libexec/poudriere/setsid/setsid.c'; else $(CYGPATH_W) '$(srcdir)/src/libexec/poudriere/setsid/setsid.c'; fi`
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) src/libexec/poudriere/setsid/$(DEPDIR)/setsid-setsid.Tpo src/libexec/poudriere/setsid/$(DEPDIR)/setsid-setsid.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='src/libexec/poudriere/setsid/setsid.c' object='src/libexec/poudriere/setsid/setsid-setsid.obj' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(setsid_CFLAGS) $(CFLAGS) -c -o src/libexec/poudriere/setsid/setsid-setsid.obj `if test -f 'src/libexec/poudriere/setsid/setsid.c'; then $(CYGPATH_W) 'src/libexec/poudriere/setsid/setsid.c'; else $(CYGPATH_W) '$(srcdir)/src/libexec/poudriere/setsid/setsid.c'; fi`
+
 external/sh/sh-alias.o: external/sh/alias.c
 @am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(sh_CFLAGS) $(CFLAGS) -MT external/sh/sh-alias.o -MD -MP -MF external/sh/$(DEPDIR)/sh-alias.Tpo -c -o external/sh/sh-alias.o `test -f 'external/sh/alias.c' || echo '$(srcdir)/'`external/sh/alias.c
 @am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) external/sh/$(DEPDIR)/sh-alias.Tpo external/sh/$(DEPDIR)/sh-alias.Po
@@ -3442,6 +3483,8 @@ distclean-generic:
 	-rm -f src/libexec/poudriere/rexec/$(am__dirstamp)
 	-rm -f src/libexec/poudriere/rm/$(DEPDIR)/$(am__dirstamp)
 	-rm -f src/libexec/poudriere/rm/$(am__dirstamp)
+	-rm -f src/libexec/poudriere/setsid/$(DEPDIR)/$(am__dirstamp)
+	-rm -f src/libexec/poudriere/setsid/$(am__dirstamp)
 	-rm -f src/libexec/poudriere/timeout/$(DEPDIR)/$(am__dirstamp)
 	-rm -f src/libexec/poudriere/timeout/$(am__dirstamp)
 	-rm -f src/libexec/poudriere/timestamp/$(DEPDIR)/$(am__dirstamp)
@@ -3529,6 +3572,7 @@ distclean: distclean-recursive
 	-rm -f src/libexec/poudriere/rexec/$(DEPDIR)/rexec-rexec.Po
 	-rm -f src/libexec/poudriere/rm/$(DEPDIR)/rm.Po
 	-rm -f src/libexec/poudriere/rm/$(DEPDIR)/sh-rm.Po
+	-rm -f src/libexec/poudriere/setsid/$(DEPDIR)/setsid-setsid.Po
 	-rm -f src/libexec/poudriere/timeout/$(DEPDIR)/timeout.Po
 	-rm -f src/libexec/poudriere/timestamp/$(DEPDIR)/timestamp.Po
 	-rm -f src/poudriere-sh/$(DEPDIR)/sh-builtins.Po
@@ -3668,6 +3712,7 @@ maintainer-clean: maintainer-clean-recursive
 	-rm -f src/libexec/poudriere/rexec/$(DEPDIR)/rexec-rexec.Po
 	-rm -f src/libexec/poudriere/rm/$(DEPDIR)/rm.Po
 	-rm -f src/libexec/poudriere/rm/$(DEPDIR)/sh-rm.Po
+	-rm -f src/libexec/poudriere/setsid/$(DEPDIR)/setsid-setsid.Po
 	-rm -f src/libexec/poudriere/timeout/$(DEPDIR)/timeout.Po
 	-rm -f src/libexec/poudriere/timestamp/$(DEPDIR)/timestamp.Po
 	-rm -f src/poudriere-sh/$(DEPDIR)/sh-builtins.Po
diff --git a/src/libexec/poudriere/setsid/c.h b/src/libexec/poudriere/setsid/c.h
new file mode 100644
index 00000000..17351e97
--- /dev/null
+++ b/src/libexec/poudriere/setsid/c.h
@@ -0,0 +1,458 @@
+/*
+ * Fundamental C definitions.
+ *
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ */
+#ifndef UTIL_LINUX_C_H
+#define UTIL_LINUX_C_H
+
+#include <limits.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include <assert.h>
+
+#ifdef HAVE_ERR_H
+# include <err.h>
+#endif
+
+#ifdef HAVE_SYS_SYSMACROS_H
+# include <sys/sysmacros.h>     /* for major, minor */
+#endif
+
+#ifndef LOGIN_NAME_MAX
+# define LOGIN_NAME_MAX 256
+#endif
+
+#ifndef NAME_MAX
+# define NAME_MAX PATH_MAX
+#endif
+
+/*
+ * __GNUC_PREREQ is deprecated in favour of __has_attribute() and
+ * __has_feature(). The __has macros are supported by clang and gcc>=5.
+ */
+#ifndef __GNUC_PREREQ
+# if defined __GNUC__ && defined __GNUC_MINOR__
+#  define __GNUC_PREREQ(maj, min) \
+	((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
+# else
+#  define __GNUC_PREREQ(maj, min) 0
+# endif
+#endif
+
+#ifdef __GNUC__
+
+/* &a[0] degrades to a pointer: a different type from an array */
+# define __must_be_array(a) \
+	UL_BUILD_BUG_ON_ZERO(__builtin_types_compatible_p(__typeof__(a), __typeof__(&a[0])))
+
+# define ignore_result(x) __extension__ ({ \
+	__typeof__(x) __dummy __attribute__((__unused__)) = (x); (void) __dummy; \
+})
+
+#else /* !__GNUC__ */
+# define __must_be_array(a)	0
+# define __attribute__(_arg_)
+# define ignore_result(x) ((void) (x))
+#endif /* !__GNUC__ */
+
+
+/* "restrict" keyword fallback */
+#if __STDC__ != 1
+# define restrict __restrict /* use implementation __ format */
+#else
+# ifndef __STDC_VERSION__
+#  define restrict __restrict /* use implementation __ format */
+# else
+#  if __STDC_VERSION__ < 199901L
+#   define restrict __restrict /* use implementation __ format */
+#  endif
+# endif
+#endif
+
+
+/*
+ * It evaluates to 1 if the attribute/feature is supported by the current
+ * compilation target. Fallback for old compilers.
+ */
+#ifndef __has_attribute
+  #define __has_attribute(x) 0
+#endif
+
+#ifndef __has_feature
+  #define __has_feature(x) 0
+#endif
+
+/*
+ * Function attributes
+ */
+#ifndef __ul_alloc_size
+# if (__has_attribute(alloc_size) && __has_attribute(warn_unused_result)) || __GNUC_PREREQ (4, 3)
+#  define __ul_alloc_size(s) __attribute__((alloc_size(s), warn_unused_result))
+# else
+#  define __ul_alloc_size(s)
+# endif
+#endif
+
+#ifndef __ul_calloc_size
+# if (__has_attribute(alloc_size) && __has_attribute(warn_unused_result)) || __GNUC_PREREQ (4, 3)
+#  define __ul_calloc_size(n, s) __attribute__((alloc_size(n, s), warn_unused_result))
+# else
+#  define __ul_calloc_size(n, s)
+# endif
+#endif
+
+#if __has_attribute(returns_nonnull) || __GNUC_PREREQ (4, 9)
+# define __ul_returns_nonnull __attribute__((returns_nonnull))
+#else
+# define __ul_returns_nonnull
+#endif
+
+/*
+ * Force a compilation error if condition is true, but also produce a
+ * result (of value 0 and type size_t), so the expression can be used
+ * e.g. in a structure initializer (or wherever else comma expressions
+ * aren't permitted).
+ */
+#define UL_BUILD_BUG_ON_ZERO(e) __extension__ (sizeof(struct { int:-!!(e); }))
+#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
+
+#ifndef ARRAY_SIZE
+# define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
+#endif
+
+#ifndef PATH_MAX
+# define PATH_MAX 4096
+#endif
+
+#ifndef TRUE
+# define TRUE 1
+#endif
+
+#ifndef FALSE
+# define FALSE 0
+#endif
+
+#ifndef min
+# define min(x, y) __extension__ ({		\
+	__typeof__(x) _min1 = (x);		\
+	__typeof__(y) _min2 = (y);		\
+	(void) (&_min1 == &_min2);		\
+	_min1 < _min2 ? _min1 : _min2; })
+#endif
+
+#ifndef max
+# define max(x, y) __extension__ ({		\
+	__typeof__(x) _max1 = (x);		\
+	__typeof__(y) _max2 = (y);		\
+	(void) (&_max1 == &_max2);		\
+	_max1 > _max2 ? _max1 : _max2; })
+#endif
+
+#ifndef cmp_numbers
+# define cmp_numbers(x, y) __extension__ ({	\
+	__typeof__(x) _a = (x);			\
+	__typeof__(y) _b = (y);			\
+	(void) (&_a == &_b);			\
+	_a == _b ? 0 : _a > _b ? 1 : -1; })
+#endif
+
+#ifndef offsetof
+#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
+#endif
+
+/*
+ * container_of - cast a member of a structure out to the containing structure
+ * @ptr:	the pointer to the member.
+ * @type:	the type of the container struct this is embedded in.
+ * @member:	the name of the member within the struct.
+ */
+#ifndef container_of
+#define container_of(ptr, type, member) __extension__ ({	\
+	const __typeof__( ((type *)0)->member ) *__mptr = (ptr); \
+	(type *)( (char *)__mptr - offsetof(type,member) );})
+#endif
+
+#ifndef HAVE_PROGRAM_INVOCATION_SHORT_NAME
+# ifdef HAVE___PROGNAME
+extern char *__progname;
+#  define program_invocation_short_name __progname
+# else
+#  ifdef HAVE_GETEXECNAME
+#   define program_invocation_short_name \
+		prog_inv_sh_nm_from_file(getexecname(), 0)
+#  else
+#   define program_invocation_short_name \
+		prog_inv_sh_nm_from_file(__FILE__, 1)
+#  endif
+static char prog_inv_sh_nm_buf[256];
+static inline char *
+prog_inv_sh_nm_from_file(char *f, char stripext)
+{
+	char *t;
+
+	if ((t = strrchr(f, '/')) != NULL)
+		t++;
+	else
+		t = f;
+
+	strncpy(prog_inv_sh_nm_buf, t, sizeof(prog_inv_sh_nm_buf) - 1);
+	prog_inv_sh_nm_buf[sizeof(prog_inv_sh_nm_buf) - 1] = '\0';
+
+	if (stripext && (t = strrchr(prog_inv_sh_nm_buf, '.')) != NULL)
+		*t = '\0';
+
+	return prog_inv_sh_nm_buf;
+}
+# endif
+#endif
+
+
+#ifndef HAVE_ERR_H
+static inline void
+errmsg(char doexit, int excode, char adderr, const char *fmt, ...)
+{
+	fprintf(stderr, "%s: ", program_invocation_short_name);
+	if (fmt != NULL) {
+		va_list argp;
+		va_start(argp, fmt);
+		vfprintf(stderr, fmt, argp);
+		va_end(argp);
+		if (adderr)
+			fprintf(stderr, ": ");
+	}
+	if (adderr)
+		fprintf(stderr, "%m");
+	fprintf(stderr, "\n");
+	if (doexit)
+		exit(excode);
+}
+
+#ifndef HAVE_ERR
+# define err(E, FMT...) errmsg(1, E, 1, FMT)
+#endif
+
+#ifndef HAVE_ERRX
+# define errx(E, FMT...) errmsg(1, E, 0, FMT)
+#endif
+
+#ifndef HAVE_WARN
+# define warn(FMT...) errmsg(0, 0, 1, FMT)
+#endif
+
+#ifndef HAVE_WARNX
+# define warnx(FMT...) errmsg(0, 0, 0, FMT)
+#endif
+#endif /* !HAVE_ERR_H */
+
+
+/* Don't use inline function to avoid '#include "nls.h"' in c.h
+ */
+#define errtryhelp(eval) __extension__ ({ \
+	fprintf(stderr, _("Try '%s --help' for more information.\n"), \
+			program_invocation_short_name); \
+	exit(eval); \
+})
+
+/* After failed execvp() */
+#define EX_EXEC_FAILED		126	/* Program located, but not usable. */
+#define EX_EXEC_ENOENT		127	/* Could not find program to exec.  */
+#define errexec(name)	err(errno == ENOENT ? EX_EXEC_ENOENT : EX_EXEC_FAILED, \
+			_("failed to execute %s"), name)
+
+
+static inline __attribute__((const)) int is_power_of_2(unsigned long num)
+{
+	return (num != 0 && ((num & (num - 1)) == 0));
+}
+
+#ifndef HAVE_LOFF_T
+typedef int64_t loff_t;
+#endif
+
+#if !defined(HAVE_DIRFD) && (!defined(HAVE_DECL_DIRFD) || HAVE_DECL_DIRFD == 0) && defined(HAVE_DIR_DD_FD)
+#include <sys/types.h>
+#include <dirent.h>
+static inline int dirfd(DIR *d)
+{
+	return d->dd_fd;
+}
+#endif
+
+/*
+ * Fallback defines for old versions of glibc
+ */
+#include <fcntl.h>
+
+#ifdef O_CLOEXEC
+#define UL_CLOEXECSTR	"e"
+#else
+#define UL_CLOEXECSTR	""
+#endif
+
+#ifndef O_CLOEXEC
+#define O_CLOEXEC 0
+#endif
+
+#ifdef __FreeBSD_kernel__
+#ifndef F_DUPFD_CLOEXEC
+#define F_DUPFD_CLOEXEC	17	/* Like F_DUPFD, but FD_CLOEXEC is set */
+#endif
+#endif
+
+
+#ifndef AI_ADDRCONFIG
+#define AI_ADDRCONFIG 0x0020
+#endif
+
+#ifndef IUTF8
+#define IUTF8 0040000
+#endif
+
+/*
+ * MAXHOSTNAMELEN replacement
+ */
+static inline size_t get_hostname_max(void)
+{
+	long len = sysconf(_SC_HOST_NAME_MAX);
+
+	if (0 < len)
+		return len;
+
+#ifdef MAXHOSTNAMELEN
+	return MAXHOSTNAMELEN;
+#elif HOST_NAME_MAX
+	return HOST_NAME_MAX;
+#endif
+	return 64;
+}
+
+/*
+ * The usleep function was marked obsolete in POSIX.1-2001 and was removed
+ * in POSIX.1-2008.  It was replaced with nanosleep() that provides more
+ * advantages (like no interaction with signals and other timer functions).
+ */
+#include <time.h>
+
+static inline int xusleep(useconds_t usec)
+{
+#ifdef HAVE_NANOSLEEP
+	struct timespec waittime = {
+		.tv_sec   =  usec / 1000000L,
+		.tv_nsec  = (usec % 1000000L) * 1000
+	};
+	return nanosleep(&waittime, NULL);
+#elif defined(HAVE_USLEEP)
+	return usleep(usec);
+#else
+# error	"System with usleep() or nanosleep() required!"
+#endif
+}
+
+/*
+ * Constant strings for usage() functions. For more info see
+ * Documentation/{howto-usage-function.txt,boilerplate.c}
+ */
+#define USAGE_HEADER     _("\nUsage:\n")
+#define USAGE_OPTIONS    _("\nOptions:\n")
+#define USAGE_FUNCTIONS  _("\nFunctions:\n")
+#define USAGE_COMMANDS   _("\nCommands:\n")
+#define USAGE_ARGUMENTS   _("\nArguments:\n")
+#define USAGE_COLUMNS    _("\nAvailable output columns:\n")
+#define USAGE_SEPARATOR    "\n"
+
+#define USAGE_OPTSTR_HELP     _("display this help")
+#define USAGE_OPTSTR_VERSION  _("display version")
+
+#define USAGE_HELP_OPTIONS(marg_dsc) \
+		"%-" #marg_dsc "s%s\n" \
+		"%-" #marg_dsc "s%s\n" \
+		, " -h, --help",    USAGE_OPTSTR_HELP \
+		, " -V, --version", USAGE_OPTSTR_VERSION
+
+#define USAGE_ARG_SEPARATOR    "\n"
+#define USAGE_ARG_SIZE(_name) \
+		_(" %s arguments may be followed by the suffixes for\n" \
+		  "   GiB, TiB, PiB, EiB, ZiB, and YiB (the \"iB\" is optional)\n"), _name
+
+#define USAGE_MAN_TAIL(_man)   _("\nFor more details see %s.\n"), _man
+
+#define UTIL_LINUX_VERSION _("%s from %s\n"), program_invocation_short_name, PACKAGE_STRING
+
+#define print_version(eval) __extension__ ({ \
+		exit(eval); \
+})
+
+/*
+ * seek stuff
+ */
+#ifndef SEEK_DATA
+# define SEEK_DATA	3
+#endif
+#ifndef SEEK_HOLE
+# define SEEK_HOLE	4
+#endif
+
+
+/*
+ * Macros to convert #define'itions to strings, for example
+ * #define XYXXY 42
+ * printf ("%s=%s\n", stringify(XYXXY), stringify_value(XYXXY));
+ */
+#define stringify_value(s) stringify(s)
+#define stringify(s) #s
+
+/* Detect if we're compiled with Address Sanitizer
+ *  - gcc (__SANITIZE_ADDRESS__)
+ *  - clang (__has_feature(address_sanitizer))
+ */
+#if !defined(HAS_FEATURE_ADDRESS_SANITIZER)
+#  ifdef __SANITIZE_ADDRESS__
+#      define HAS_FEATURE_ADDRESS_SANITIZER 1
+#  elif defined(__has_feature)
+#    if __has_feature(address_sanitizer)
+#      define HAS_FEATURE_ADDRESS_SANITIZER 1
+#    endif
+#  endif
+#  if !defined(HAS_FEATURE_ADDRESS_SANITIZER)
+#    define HAS_FEATURE_ADDRESS_SANITIZER 0
+#  endif
+#endif
+
+/*
+ * UL_ASAN_BLACKLIST is a macro to tell AddressSanitizer (a compile-time
+ * instrumentation shipped with Clang and GCC) to not instrument the
+ * annotated function.  Furthermore, it will prevent the compiler from
+ * inlining the function because inlining currently breaks the blacklisting
+ * mechanism of AddressSanitizer.
+ */
+#if __has_feature(address_sanitizer) && __has_attribute(no_sanitize_memory) && __has_attribute(no_sanitize_address)
+# define UL_ASAN_BLACKLIST __attribute__((noinline)) __attribute__((no_sanitize_memory)) __attribute__((no_sanitize_address))
+#else
+# define UL_ASAN_BLACKLIST	/* nothing */
+#endif
+
+/*
+ * Note that sysconf(_SC_GETPW_R_SIZE_MAX) returns *initial* suggested size for
+ * pwd buffer and in some cases it is not large enough. See POSIX and
+ * getpwnam_r man page for more details.
+ */
+#define UL_GETPW_BUFSIZ	(16 * 1024)
+
+/*
+ * Darwin or other BSDs may only have MAP_ANON. To get it on Darwin we must
+ * define _DARWIN_C_SOURCE before including sys/mman.h. We do this in config.h.
+ */
+#if !defined MAP_ANONYMOUS && defined MAP_ANON
+# define MAP_ANONYMOUS  (MAP_ANON)
+#endif
+
+#endif /* UTIL_LINUX_C_H */
diff --git a/src/libexec/poudriere/setsid/setsid.1 b/src/libexec/poudriere/setsid/setsid.1
new file mode 100644
index 00000000..c1553c8e
--- /dev/null
+++ b/src/libexec/poudriere/setsid/setsid.1
@@ -0,0 +1,69 @@
+'\" t
+.\"     Title: setsid
+.\"    Author: [see the "AUTHOR(S)" section]
+.\" Generator: Asciidoctor 2.0.12
+.\"      Date: 2021-06-27
+.\"    Manual: User Commands
+.\"    Source: util-linux 2.37
+.\"  Language: English
+.\"
+.TH "SETSID" "1" "2021-06-27" "util\-linux 2.37" "User Commands"
+.ie \n(.g .ds Aq \(aq
+.el       .ds Aq '
+.ss \n[.ss] 0
+.nh
+.ad l
+.de URL
+\fI\\$2\fP <\\$1>\\$3
+..
+.als MTO URL
+.if \n[.g] \{\
+.  mso www.tmac
+.  am URL
+.    ad l
+.  .
+.  am MTO
+.    ad l
+.  .
+.  LINKSTYLE blue R < >
+.\}
+.SH "NAME"
+setsid \- run a program in a new session
+.SH "SYNOPSIS"
+.sp
+\fBsetsid\fP [options] \fIprogram\fP [\fIarguments\fP]
+.SH "DESCRIPTION"
+.sp
+\fBsetsid\fP runs a program in a new session. The command calls \fBfork\fP(2) if already a process group leader. Otherwise, it executes a program in the current process. This default behavior is possible to override by the \fB\-\-fork\fP option.
+.SH "OPTIONS"
+.sp
+\fB\-c\fP, \fB\-\-ctty\fP
+.RS 4
+Set the controlling terminal to the current one.
+.RE
+.sp
+\fB\-f\fP, \fB\-\-fork\fP
+.RS 4
+Always create a new process.
+.RE
+.sp
+\fB\-w\fP, \fB\-\-wait\fP
+.RS 4
+Wait for the execution of the program to end, and return the exit status of this program as the exit status of \fBsetsid\fP.
+.RE
+.sp
+\fB\-V\fP, \fB\-\-version\fP
+.RS 4
+Display version information and exit.
+.RE
+.sp
+\fB\-h\fP, \fB\-\-help\fP
+.RS 4
+Display help text and exit.
+.RE
+.SH "AUTHORS"
+.sp
+.MTO "jrs\(atworld.std.com" "Rick Sladkey" ""
+.SH "SEE ALSO"
+.sp
+\fBsetsid\fP(2)
\ No newline at end of file
diff --git a/src/libexec/poudriere/setsid/setsid.c b/src/libexec/poudriere/setsid/setsid.c
new file mode 100644
index 00000000..5eafea4b
--- /dev/null
+++ b/src/libexec/poudriere/setsid/setsid.c
@@ -0,0 +1,120 @@
+/*
+ * setsid.c -- execute a command in a new session
+ * Rick Sladkey <jrs@world.std.com>
+ * In the public domain.
+ *
+ * 1999-02-22 Arkadiusz Miśkiewicz <misiek@pld.ORG.PL>
+ * - added Native Language Support
+ *
+ * 2001-01-18 John Fremlin <vii@penguinpowered.com>
+ * - fork in case we are process group leader
+ *
+ * 2008-08-20 Daniel Kahn Gillmor <dkg@fifthhorseman.net>
+ * - if forked, wait on child process and emit its return code.
+ */
+
+#include <getopt.h>
+#include <locale.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include "c.h"
+
+#define _(x) (x)
+
+static void __attribute__((__noreturn__)) usage(void)
+{
+	FILE *out = stdout;
+	fputs(USAGE_HEADER, out);
+	fprintf(out, _(
+		" %s [options] <program> [arguments ...]\n"),
+		program_invocation_short_name);
+
+	fputs(USAGE_SEPARATOR, out);
+	fputs(_("Run a program in a new session.\n"), out);
+
+	fputs(USAGE_OPTIONS, out);
+	fputs(_(" -c, --ctty     set the controlling terminal to the current one\n"), out);
+	fputs(_(" -f, --fork     always fork\n"), out);
+	fputs(_(" -w, --wait     wait program to exit, and use the same return\n"), out);
+
+	printf(USAGE_HELP_OPTIONS(16));
+
+	printf(USAGE_MAN_TAIL("setsid(1)"));
+	exit(EXIT_SUCCESS);
+}
+
+int main(int argc, char **argv)
+{
+	int ch, forcefork = 0;
+	int ctty = 0;
+	pid_t pid;
+	int status = 0;
+
+	static const struct option longopts[] = {
+		{"ctty", no_argument, NULL, 'c'},
+		{"fork", no_argument, NULL, 'f'},
+		{"wait", no_argument, NULL, 'w'},
+		{"version", no_argument, NULL, 'V'},
+		{"help", no_argument, NULL, 'h'},
+		{NULL, 0, NULL, 0}
+	};
+
+	setlocale(LC_ALL, "");
+
+	while ((ch = getopt_long(argc, argv, "+Vhcfw", longopts, NULL)) != -1)
+		switch (ch) {
+		case 'c':
+			ctty=1;
+			break;
+		case 'f':
+			forcefork = 1;
+			break;
+		case 'w':
+			status = 1;
+			break;
+
+		case 'h':
+			usage();
+		case 'V':
+			print_version(EXIT_SUCCESS);
+		default:
+			exit(EXIT_FAILURE);
+		}
+
+	if (argc - optind < 1) {
+		errx(EXIT_FAILURE, _("no command specified"));
+	}
+
+	if (forcefork || getpgrp() == getpid()) {
+		pid = fork();
+		switch (pid) {
+		case -1:
+			err(EXIT_FAILURE, _("fork"));
+		case 0:
+			/* child */
+			break;
+		default:
+			/* parent */
+			if (!status)
+				return EXIT_SUCCESS;
+			if (wait(&status) != pid)
+				err(EXIT_FAILURE, "wait");
+			if (WIFEXITED(status))
+				return WEXITSTATUS(status);
+			err(status, _("child %d did not exit normally"), pid);
+		}
+	}
+	if (setsid() < 0)
+		/* cannot happen */
+		err(EXIT_FAILURE, _("setsid failed"));
+
+	if (ctty && ioctl(STDIN_FILENO, TIOCSCTTY, 1))
+		err(EXIT_FAILURE, _("failed to set the controlling terminal"));
+	execvp(argv[optind], argv + optind);
+	errexec(argv[optind]);
+}