dnl
dnl Bash specific tests
dnl
dnl Some derived from PDKSH 5.1.3 autoconf tests
dnl
dnl check whether cc can create executables
dnl
AC_DEFUN(BASH_CC_WORKS,
[AC_CACHE_CHECK(whether CC works at all, bash_cv_prog_cc_works,	
	[AC_TRY_RUN([main() { exit(0); }],
		bash_cv_prog_cc_works=yes, bash_cv_prog_cc_works=no,
		bash_cv_prog_cc_works=no)
	]
)
if test "$bash_cv_prog_cc_works" = "no"; then
AC_MSG_ERROR([Installation or configuration problem: C compiler cannot create executables])
fi
])

dnl
dnl Check if dup2() does not clear the close on exec flag
dnl
AC_DEFUN(BASH_DUP2_CLOEXEC_CHECK,
[AC_MSG_CHECKING(if dup2 fails to clear the close-on-exec flag)
AC_CACHE_VAL(bash_cv_dup2_broken,
[AC_TRY_RUN([
#include <sys/types.h>
#include <fcntl.h>
main()
{
  int fd1, fd2, fl;
  fd1 = open("/dev/null", 2);
  if (fcntl(fd1, 2, 1) < 0)
    exit(1);
  fd2 = dup2(fd1, 1);
  if (fd2 < 0)
    exit(2);
  fl = fcntl(fd2, 1, 0);
  /* fl will be 1 if dup2 did not reset the close-on-exec flag. */
  exit(fl != 1);
}
], bash_cv_dup2_broken=yes, bash_cv_dup2_broken=no,
    AC_MSG_ERROR(cannot check dup2 if cross compiling))
])
AC_MSG_RESULT($bash_cv_dup2_broken)
if test $bash_cv_dup2_broken = yes; then
AC_DEFINE(DUP2_BROKEN)
fi
])

dnl Check type of signal routines (posix, 4.2bsd, 4.1bsd or v7)
AC_DEFUN(BASH_SIGNAL_CHECK,
[AC_REQUIRE([AC_TYPE_SIGNAL])
AC_MSG_CHECKING(for type of signal functions)
AC_CACHE_VAL(bash_cv_signal_vintage,
[
  AC_TRY_LINK([#include <signal.h>],[
    sigset_t ss;
    struct sigaction sa;
    sigemptyset(&ss); sigsuspend(&ss);
    sigaction(SIGINT, &sa, (struct sigaction *) 0);
    sigprocmask(SIG_BLOCK, &ss, (sigset_t *) 0);
  ], bash_cv_signal_vintage=posix,
  [
    AC_TRY_LINK([#include <signal.h>], [
	int mask = sigmask(SIGINT);
	sigsetmask(mask); sigblock(mask); sigpause(mask);
    ], bash_cv_signal_vintage=4.2bsd,
    [
      AC_TRY_LINK([
	#include <signal.h>
	RETSIGTYPE foo() { }], [
		int mask = sigmask(SIGINT);
		sigset(SIGINT, foo); sigrelse(SIGINT);
		sighold(SIGINT); sigpause(SIGINT);
        ], bash_cv_signal_vintage=svr3, bash_cv_signal_vintage=v7
    )]
  )]
)
])
AC_MSG_RESULT($bash_cv_signal_vintage)
if test "$bash_cv_signal_vintage" = posix; then
AC_DEFINE(HAVE_POSIX_SIGNALS)
elif test "$bash_cv_signal_vintage" = "4.2bsd"; then
AC_DEFINE(HAVE_BSD_SIGNALS)
elif test "$bash_cv_signal_vintage" = svr3; then
AC_DEFINE(HAVE_USG_SIGHOLD)
fi
])

dnl Check if the pgrp of setpgrp() can't be the pid of a zombie process.
AC_DEFUN(BASH_PGRP_SYNC,
[AC_REQUIRE([AC_FUNC_GETPGRP])
AC_MSG_CHECKING(whether pgrps need synchronization)
AC_CACHE_VAL(bash_cv_pgrp_pipe,
[AC_TRY_RUN([
#ifdef HAVE_UNISTD_H
#  include <unistd.h>
#endif
main()
{
# ifdef GETPGRP_VOID
#  define getpgID()	getpgrp()
# else
#  define getpgID()	getpgrp(0)
#  define setpgid(x,y)	setpgrp(x,y)
# endif
	int pid1, pid2, fds[2];
	int status;
	char ok;

	switch (pid1 = fork()) {
	  case -1:
	    exit(1);
	  case 0:
	    setpgid(0, getpid());
	    exit(0);
	}
	setpgid(pid1, pid1);

	sleep(2);	/* let first child die */

	if (pipe(fds) < 0)
	  exit(2);

	switch (pid2 = fork()) {
	  case -1:
	    exit(3);
	  case 0:
	    setpgid(0, pid1);
	    ok = getpgID() == pid1;
	    write(fds[1], &ok, 1);
	    exit(0);
	}
	setpgid(pid2, pid1);

	close(fds[1]);
	if (read(fds[0], &ok, 1) != 1)
	  exit(4);
	wait(&status);
	wait(&status);
	exit(ok ? 0 : 5);
}
], bash_cv_pgrp_pipe=no,bash_cv_pgrp_pipe=yes,
   AC_MSG_ERROR(cannot check pgrp synchronization if cross compiling))
])
AC_MSG_RESULT($bash_cv_pgrp_pipe)
if test $bash_cv_pgrp_pipe = yes; then
AC_DEFINE(PGRP_PIPE)
fi
])

dnl
dnl check for typedef'd symbols in header files, but allow the caller to
dnl specify the include files to be checked in addition to the default
dnl 
dnl BASH_CHECK_TYPE(TYPE, HEADERS, DEFAULT[, VALUE-IF-FOUND])
AC_DEFUN(BASH_CHECK_TYPE,
[AC_REQUIRE([AC_HEADER_STDC])dnl
AC_MSG_CHECKING(for $1)
AC_CACHE_VAL(bash_cv_type_$1,
[AC_EGREP_CPP($1, [#include <sys/types.h>
#if STDC_HEADERS
#include <stdlib.h>
#endif
$2
], bash_cv_type_$1=yes, bash_cv_type_$1=no)])
AC_MSG_RESULT($bash_cv_type_$1)
ifelse($#, 4, [if test $bash_cv_type_$1 = yes; then
	AC_DEFINE($4)
	fi])
if test $bash_cv_type_$1 = no; then
  AC_DEFINE($1, $3)
fi
])

dnl
dnl Type of struct rlimit fields: some systems (OSF/1, NetBSD, RISC/os 5.0)
dnl have a rlim_t, others (4.4BSD based systems) use quad_t, others use
dnl long and still others use int (HP-UX 9.01, SunOS 4.1.3).  To simplify
dnl matters, this just checks for rlim_t, quad_t, or long.
dnl
AC_DEFUN(BASH_RLIMIT_TYPE,
[AC_MSG_CHECKING(for size and type of struct rlimit fields)
AC_CACHE_VAL(bash_cv_type_rlimit,
[AC_TRY_COMPILE([#include <sys/types.h>],
[rlim_t xxx;], bash_cv_type_rlimit=rlim_t,[
AC_TRY_RUN([
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
main()
{
#ifdef HAVE_QUAD_T
  struct rlimit rl;
  if (sizeof(rl.rlim_cur) == sizeof(quad_t))
    exit(0);
#endif
  exit(1);
}], bash_cv_type_rlimit=quad_t, bash_cv_type_rlimit=long,
        AC_MSG_ERROR(cannot check quad_t if cross compiling))])
])
AC_MSG_RESULT($bash_cv_type_rlimit)
if test $bash_cv_type_rlimit = quad_t; then
AC_DEFINE(RLIMTYPE, quad_t)
elif test $bash_cv_type_rlimit = rlim_t; then
AC_DEFINE(RLIMTYPE, rlim_t)
fi
])

dnl
dnl Check for sys_siglist[] or _sys_siglist[]
dnl
AC_DEFUN(BASH_UNDER_SYS_SIGLIST,
[AC_MSG_CHECKING([for _sys_siglist in system C library])
AC_CACHE_VAL(bash_cv_under_sys_siglist,
[AC_TRY_RUN([
#include <sys/types.h>
#include <signal.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifndef _sys_siglist
extern char *_sys_siglist[];
#endif
main()
{
char *msg = _sys_siglist[2];
exit(msg == 0);
}],
bash_cv_under_sys_siglist=yes, bash_cv_under_sys_siglist=no,
AC_MSG_ERROR(cannot check for _sys_siglist[] if cross compiling))])dnl
AC_MSG_RESULT($bash_cv_under_sys_siglist)
if test $bash_cv_under_sys_siglist = yes; then
AC_DEFINE(HAVE_UNDER_SYS_SIGLIST)
fi
])

AC_DEFUN(BASH_SYS_SIGLIST,
[AC_REQUIRE([AC_DECL_SYS_SIGLIST])
AC_MSG_CHECKING([for sys_siglist in system C library])
AC_CACHE_VAL(bash_cv_sys_siglist,
[AC_TRY_RUN([
#include <sys/types.h>
#include <signal.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifndef SYS_SIGLIST_DECLARED
extern char *sys_siglist[];
#endif
main()
{
char *msg = sys_siglist[2];
exit(msg == 0);
}],
bash_cv_sys_siglist=yes, bash_cv_sys_siglist=no,
AC_MSG_ERROR(cannot check for sys_siglist if cross compiling))])dnl
AC_MSG_RESULT($bash_cv_sys_siglist)
if test $bash_cv_sys_siglist = yes; then
AC_DEFINE(HAVE_SYS_SIGLIST)
fi
])

dnl Check for sys_errlist[] and sys_nerr, check for declaration
AC_DEFUN(BASH_SYS_ERRLIST,
[AC_MSG_CHECKING([for sys_errlist and sys_nerr])
AC_CACHE_VAL(bash_cv_sys_errlist,
[AC_TRY_LINK([#include <errno.h>],
[extern char *sys_errlist[];
 extern int sys_nerr;
 char *msg = sys_errlist[sys_nerr - 1];],
    bash_cv_sys_errlist=yes, bash_cv_sys_errlist=no)])dnl
AC_MSG_RESULT($bash_cv_sys_errlist)
if test $bash_cv_sys_errlist = yes; then
AC_DEFINE(HAVE_SYS_ERRLIST)
fi
])

dnl Check to see if opendir will open non-directories (not a nice thing)
AC_DEFUN(BASH_FUNC_OPENDIR_CHECK,
[AC_REQUIRE([AC_HEADER_DIRENT])dnl
AC_MSG_CHECKING(if opendir() opens non-directories)
AC_CACHE_VAL(bash_cv_opendir_not_robust,
[AC_TRY_RUN([
#include <stdio.h>
#include <sys/types.h>
#include <fcntl.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#if defined(HAVE_DIRENT_H)
# include <dirent.h>
#else
# define dirent direct
# ifdef HAVE_SYS_NDIR_H
#  include <sys/ndir.h>
# endif /* SYSNDIR */
# ifdef HAVE_SYS_DIR_H
#  include <sys/dir.h>
# endif /* SYSDIR */
# ifdef HAVE_NDIR_H
#  include <ndir.h>
# endif
#endif /* HAVE_DIRENT_H */
main()
{
DIR *dir;
int fd;
unlink("/tmp/not_a_directory");
fd = open("/tmp/not_a_directory", O_WRONLY|O_CREAT, 0666);
write(fd, "\n", 1);
close(fd);
dir = opendir("/tmp/not_a_directory");
unlink("/tmp/not_a_directory");
exit (dir == 0);
}], bash_cv_opendir_not_robust=yes,bash_cv_opendir_not_robust=no,
    AC_MSG_ERROR(cannot check opendir if cross compiling))])
AC_MSG_RESULT($bash_cv_opendir_not_robust)
if test $bash_cv_opendir_not_robust = yes; then
AC_DEFINE(OPENDIR_NOT_ROBUST)
fi
])

dnl
AC_DEFUN(BASH_TYPE_SIGHANDLER,
[AC_MSG_CHECKING([whether signal handlers are of type void])
AC_CACHE_VAL(bash_cv_void_sighandler,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <signal.h>
#ifdef signal
#undef signal
#endif
#ifdef __cplusplus
extern "C"
#endif
void (*signal ()) ();],
[int i;], bash_cv_void_sighandler=yes, bash_cv_void_sighandler=no)])dnl
AC_MSG_RESULT($bash_cv_void_sighandler)
if test $bash_cv_void_sighandler = yes; then
AC_DEFINE(VOID_SIGHANDLER)
fi
])

AC_DEFUN(BASH_FUNC_STRSIGNAL,
[AC_MSG_CHECKING([for the existance of strsignal])
AC_CACHE_VAL(bash_cv_have_strsignal,
[AC_TRY_LINK([#include <sys/types.h>
#include <signal.h>],
[char *s = (char *)strsignal(2);],
 bash_cv_have_strsignal=yes, bash_cv_have_strsignal=no)])
AC_MSG_RESULT($bash_cv_have_strsignal)
if test $bash_cv_have_strsignal = yes; then
AC_DEFINE(HAVE_STRSIGNAL)
fi
])

AC_DEFUN(BASH_FUNC_LSTAT,
[dnl Cannot use AC_CHECK_FUNCS(lstat) because Linux defines lstat() as an
dnl inline function in <sys/stat.h>.
AC_CACHE_CHECK([for lstat], bash_cv_func_lstat,
[AC_TRY_LINK([
#include <sys/types.h>
#include <sys/stat.h>
],[ lstat("",(struct stat *)0); ],
bash_cv_func_lstat=yes, bash_cv_func_lstat=no)])
if test $bash_cv_func_lstat = yes; then
  AC_DEFINE(HAVE_LSTAT)
fi
])

AC_DEFUN(BASH_STRUCT_TERMIOS_LDISC,
[AC_MSG_CHECKING([for a c_line member of struct termios])
AC_CACHE_VAL(bash_cv_termios_ldisc,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <termios.h>],[struct termios t; int i; i = t.c_line;],
  bash_cv_termios_ldisc=yes, bash_cv_termios_ldisc=no)])dnl
AC_MSG_RESULT($bash_cv_termios_ldisc)
if test $bash_cv_termios_ldisc = yes; then
AC_DEFINE(TERMIOS_LDISC)
fi
])

AC_DEFUN(BASH_STRUCT_TERMIO_LDISC,
[AC_MSG_CHECKING([for a c_line member of struct termio])
AC_CACHE_VAL(bash_cv_termio_ldisc,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <termio.h>],[struct termio t; int i; i = t.c_line;],
  bash_cv_termio_ldisc=yes, bash_cv_termio_ldisc=no)])dnl
AC_MSG_RESULT($bash_cv_termio_ldisc)
if test $bash_cv_termio_ldisc = yes; then
AC_DEFINE(TERMIO_LDISC)
fi
])

AC_DEFUN(BASH_FUNC_GETENV,
[AC_MSG_CHECKING(to see if getenv can be redefined)
AC_CACHE_VAL(bash_cv_getenv_redef,
[AC_TRY_RUN([
#ifdef HAVE_UNISTD_H
#  include <unistd.h>
#endif
#ifndef __STDC__
#  ifndef const
#    define const
#  endif
#endif
char *
getenv (name)
#if defined (__linux__) || defined (__bsdi__) || defined (convex)
     const char *name;
#else
     char const *name;
#endif /* !__linux__ && !__bsdi__ && !convex */
{
return "42";
}
main()
{
char *s;
/* The next allows this program to run, but does not allow bash to link
   when it redefines getenv.  I'm not really interested in figuring out
   why not. */
#if defined (NeXT)
exit(1);
#endif
s = getenv("ABCDE");
exit(s == 0);	/* force optimizer to leave getenv in */
}
], bash_cv_getenv_redef=yes, bash_cv_getenv_redef=no,
AC_MSG_ERROR(cannot check getenv redefinition if cross compiling))])
AC_MSG_RESULT($bash_cv_getenv_redef)
if test $bash_cv_getenv_redef = yes; then
AC_DEFINE(CAN_REDEFINE_GETENV)
fi
])

AC_DEFUN(BASH_FUNC_PRINTF,
[AC_MSG_CHECKING(for declaration of printf in <stdio.h>)
AC_CACHE_VAL(bash_cv_printf_declared,
[AC_TRY_RUN([
#include <stdio.h>
#ifdef __STDC__
typedef int (*_bashfunc)(const char *, ...);
#else
typedef int (*_bashfunc)();
#endif
main()
{
_bashfunc pf;
pf = printf;
exit(pf == 0);
}
],bash_cv_printf_declared=yes, bash_cv_printf_declared=no,
AC_MSG_ERROR(cannot check printf declaration if cross compiling))])
AC_MSG_RESULT($bash_cv_printf_declared)
if test $bash_cv_printf_declared = yes; then
AC_DEFINE(PRINTF_DECLARED)
fi
])

AC_DEFUN(BASH_FUNC_ULIMIT_MAXFDS,
[AC_MSG_CHECKING(whether ulimit can substitute for getdtablesize)
AC_CACHE_VAL(bash_cv_ulimit_maxfds,
[AC_TRY_RUN([
main()
{
long maxfds = ulimit(4, 0L);
exit (maxfds == -1L);
}
],bash_cv_ulimit_maxfds=yes, bash_cv_ulimit_maxfds=no,
AC_MSG_ERROR(cannot check ulimit if cross compiling))])
AC_MSG_RESULT($bash_cv_ulimit_maxfds)
if test $bash_cv_ulimit_maxfds = yes; then
AC_DEFINE(ULIMIT_MAXFDS)
fi
])

AC_DEFUN(BASH_CHECK_LIB_TERMCAP,
[
if test "X$bash_cv_termcap_lib" = "X"; then
_bash_needmsg=yes
else
AC_MSG_CHECKING(which library has the termcap functions)
_bash_needmsg=
fi
AC_CACHE_VAL(bash_cv_termcap_lib,
[AC_CHECK_LIB(termcap, tgetent, bash_cv_termcap_lib=libtermcap,
    [AC_CHECK_LIB(curses, tgetent, bash_cv_termcap_lib=libcurses,
	[AC_CHECK_LIB(ncurses, tgetent, bash_cv_termcap_lib=libncurses,
	    bash_cv_termcap_lib=gnutermcap)])])])
if test "X$_bash_needmsg" = "Xyes"; then
AC_MSG_CHECKING(which library has the termcap functions)
fi
AC_MSG_RESULT(using $bash_cv_termcap_lib)
if test $bash_cv_termcap_lib = gnutermcap; then
LDFLAGS="$LDFLAGS -L./lib/termcap"
TERMCAP_LIB="./lib/termcap/libtermcap.a"
TERMCAP_DEP="./lib/termcap/libtermcap.a"
elif test $bash_cv_termcap_lib = libtermcap; then
TERMCAP_LIB=-ltermcap
TERMCAP_DEP=
elif test $bash_cv_termcap_lib = libncurses; then
TERMCAP_LIB=-lncurses
TERMCAP_DEP=
else
TERMCAP_LIB=-lcurses
TERMCAP_DEP=
fi
])

AC_DEFUN(BASH_FUNC_GETCWD,
[AC_MSG_CHECKING([if getcwd() calls popen()])
AC_CACHE_VAL(bash_cv_getcwd_calls_popen,
[AC_TRY_RUN([
#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifndef __STDC__
#ifndef const
#define const
#endif
#endif

int popen_called;

FILE *
popen(command, type)
     const char *command;
     const char *type;
{
	popen_called = 1;
	return (FILE *)NULL;
}

FILE *_popen(command, type)
     const char *command;
     const char *type;
{
  return (popen (command, type));
}

int
pclose(stream)
FILE *stream;
{
	return 0;
}

int
_pclose(stream)
FILE *stream;
{
	return 0;
}

main()
{
	char	lbuf[32];
	popen_called = 0;
	getcwd(lbuf, 32);
	exit (popen_called);
}
], bash_cv_getcwd_calls_popen=no, bash_cv_getcwd_calls_popen=yes,
AC_MSG_ERROR(cannot check whether getcwd calls popen if cross compiling))])
AC_MSG_RESULT($bash_cv_getcwd_calls_popen)
if test $bash_cv_getcwd_calls_popen = yes; then
AC_DEFINE(GETCWD_BROKEN)
fi
])

AC_DEFUN(BASH_STRUCT_DIRENT_D_INO,
[AC_REQUIRE([AC_HEADER_DIRENT])
AC_MSG_CHECKING(if struct dirent has a d_ino member)
AC_CACHE_VAL(bash_cv_dirent_has_dino,
[AC_TRY_COMPILE([
#include <stdio.h>
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#if defined(HAVE_DIRENT_H)
# include <dirent.h>
#else
# define dirent direct
# ifdef HAVE_SYS_NDIR_H
#  include <sys/ndir.h>
# endif /* SYSNDIR */
# ifdef HAVE_SYS_DIR_H
#  include <sys/dir.h>
# endif /* SYSDIR */
# ifdef HAVE_NDIR_H
#  include <ndir.h>
# endif
#endif /* HAVE_DIRENT_H */
],[
struct dirent d; int z; z = d.d_ino;
], bash_cv_dirent_has_dino=yes, bash_cv_dirent_has_dino=no)])
AC_MSG_RESULT($bash_cv_dirent_has_dino)
if test $bash_cv_dirent_has_dino = yes; then
AC_DEFINE(STRUCT_DIRENT_HAS_D_INO)
fi
])

AC_DEFUN(BASH_REINSTALL_SIGHANDLERS,
[AC_REQUIRE([AC_TYPE_SIGNAL])
AC_REQUIRE([BASH_SIGNAL_CHECK])
AC_MSG_CHECKING([if signal handlers must be reinstalled when invoked])
AC_CACHE_VAL(bash_cv_must_reinstall_sighandlers,
[AC_TRY_RUN([
#include <signal.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

typedef RETSIGTYPE sigfunc();

int nsigint;

#ifdef HAVE_POSIX_SIGNALS
sigfunc *
set_signal_handler(sig, handler)
     int sig;
     sigfunc *handler;
{
  struct sigaction act, oact;
  act.sa_handler = handler;
  act.sa_flags = 0;
  sigemptyset (&act.sa_mask);
  sigemptyset (&oact.sa_mask);
  sigaction (sig, &act, &oact);
  return (oact.sa_handler);
}
#else
#define set_signal_handler(s, h) signal(s, h)
#endif

RETSIGTYPE
sigint(s)
int s;
{
  nsigint++;
}

main()
{
	nsigint = 0;
	set_signal_handler(SIGINT, sigint);
	kill((int)getpid(), SIGINT);
	kill((int)getpid(), SIGINT);
	exit(nsigint != 2);
}
], bash_cv_must_reinstall_sighandlers=no, bash_cv_must_reinstall_sighandlers=yes,
AC_MSG_ERROR(cannot check signal handling if cross compiling))])
AC_MSG_RESULT($bash_cv_must_reinstall_sighandlers)
if test $bash_cv_must_reinstall_sighandlers = yes; then
AC_DEFINE(MUST_REINSTALL_SIGHANDLERS)
fi
])

AC_DEFUN(BASH_FUNC_SBRK_DECLARED,
[AC_MSG_CHECKING(for declaration of sbrk in <unistd.h>)
AC_CACHE_VAL(bash_cv_sbrk_declared,
[AC_EGREP_HEADER(sbrk, unistd.h,
 bash_cv_sbrk_declared=yes, bash_cv_sbrk_declared=no)])
AC_MSG_RESULT($bash_cv_sbrk_declared)
if test $bash_cv_sbrk_declared = yes; then
AC_DEFINE(SBRK_DECLARED)
fi
])

dnl check that some necessary job control definitions are present
AC_DEFUN(BASH_JOB_CONTROL_MISSING,
[AC_REQUIRE([BASH_SIGNAL_CHECK])
AC_MSG_CHECKING(for presence of necessary job control definitions)
AC_CACHE_VAL(bash_cv_job_control_missing,
[AC_TRY_RUN([
#include <sys/types.h>
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <signal.h>

/* Add more tests in here as appropriate. */
main()
{
/* signal type */
#if !defined (HAVE_POSIX_SIGNALS) && !defined (HAVE_BSD_SIGNALS)
exit(1);
#endif

/* signals and tty control. */
#if !defined (SIGTSTP) || !defined (SIGSTOP) || !defined (SIGCONT)
exit (1);
#endif

/* process control */
#if !defined (WNOHANG) || !defined (WUNTRACED) 
exit(1);
#endif

/* Posix systems have tcgetpgrp and waitpid. */
#if defined (_POSIX_VERSION) && !defined (HAVE_TCGETPGRP)
exit(1);
#endif

#if defined (_POSIX_VERSION) && !defined (HAVE_WAITPID)
exit(1);
#endif

/* Other systems have TIOCSPGRP/TIOCGPRGP and wait3. */
#if !defined (_POSIX_VERSION) && !defined (HAVE_WAIT3)
exit(1);
#endif

exit(0);
}],bash_cv_job_control_missing=present, bash_cv_job_control_missing=missing,
	AC_MSG_ERROR(cannot check job control if cross-compiling))
])
AC_MSG_RESULT($bash_cv_job_control_missing)
if test $bash_cv_job_control_missing = missing; then
AC_DEFINE(JOB_CONTROL_MISSING)
fi
])

dnl check whether named pipes are present
dnl this requires a previous check for mkfifo, but that is awkward to specify
AC_DEFUN(BASH_SYS_NAMED_PIPES,
[AC_MSG_CHECKING(for presence of named pipes)
AC_CACHE_VAL(bash_cv_sys_named_pipes,
[AC_TRY_RUN([
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

/* Add more tests in here as appropriate. */
main()
{
int fd;

#if defined (HAVE_MKFIFO)
exit (0);
#endif

#if !defined (S_IFIFO) && (defined (_POSIX_VERSION) && !defined (S_ISFIFO))
exit (1);
#endif

#if defined (NeXT)
exit (1);
#endif

fd = mknod ("/tmp/sh-np-autoconf", 0666 | S_IFIFO, 0);
if (fd == -1)
  exit (1);
close(fd);
unlink ("/tmp/sh-np-autoconf");
exit(0);
}],bash_cv_sys_named_pipes=present, bash_cv_sys_named_pipes=missing,
	AC_MSG_ERROR(cannot check for named pipes if cross-compiling))
])
AC_MSG_RESULT($bash_cv_sys_named_pipes)
if test $bash_cv_sys_named_pipes = missing; then
AC_DEFINE(NAMED_PIPES_MISSING)
fi
])

AC_DEFUN(BASH_FUNC_POSIX_SETJMP,
[AC_REQUIRE([BASH_SIGNAL_CHECK])
AC_MSG_CHECKING(for presence of POSIX-style sigsetjmp/siglongjmp)
AC_CACHE_VAL(bash_cv_func_sigsetjmp,
[AC_TRY_RUN([
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <sys/types.h>
#include <signal.h>
#include <setjmp.h>

main()
{
#if !defined (_POSIX_VERSION) || !defined (HAVE_POSIX_SIGNALS)
exit (1);
#else

int code;
sigset_t set, oset;
sigjmp_buf xx;

/* get the mask */
sigemptyset(&set);
sigemptyset(&oset);
sigprocmask(SIG_BLOCK, (sigset_t *)NULL, &set);
sigprocmask(SIG_BLOCK, (sigset_t *)NULL, &oset);

/* save it */
code = sigsetjmp(xx, 1);
if (code)
  exit(0);	/* could get sigmask and compare to oset here. */

/* change it */
sigaddset(&set, SIGINT);
sigprocmask(SIG_BLOCK, &set, (sigset_t *)NULL);

/* and siglongjmp */
siglongjmp(xx, 10);
exit(1);
#endif
}],bash_cv_func_sigsetjmp=present, bash_cv_func_sigsetjmp=missing,
   AC_MSG_ERROR(cannot check for sigsetjmp/siglongjmp if cross-compiling))
])
AC_MSG_RESULT($bash_cv_func_sigsetjmp)
if test $bash_cv_func_sigsetjmp = present; then
AC_DEFINE(HAVE_POSIX_SIGSETJMP)
fi
])

AC_DEFUN(BASH_HAVE_TIOCGWINSZ,
[AC_MSG_CHECKING(for TIOCGWINSZ in sys/ioctl.h)
AC_CACHE_VAL(bash_cv_tiocgwinsz_in_ioctl,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/ioctl.h>], [int x = TIOCGWINSZ;],
  bash_cv_tiocgwinsz_in_ioctl=yes,bash_cv_tiocgwinsz_in_ioctl=no)])
AC_MSG_RESULT($bash_cv_tiocgwinsz_in_ioctl)
if test $bash_cv_tiocgwinsz_in_ioctl = yes; then   
AC_DEFINE(GWINSZ_IN_SYS_IOCTL)
fi
])

AC_DEFUN(BASH_HAVE_TIOCSTAT,
[AC_MSG_CHECKING(for TIOCSTAT in sys/ioctl.h)
AC_CACHE_VAL(bash_cv_tiocstat_in_ioctl,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/ioctl.h>], [int x = TIOCSTAT;],
  bash_cv_tiocstat_in_ioctl=yes,bash_cv_tiocstat_in_ioctl=no)])
AC_MSG_RESULT($bash_cv_tiocstat_in_ioctl)
if test $bash_cv_tiocstat_in_ioctl = yes; then   
AC_DEFINE(TIOCSTAT_IN_SYS_IOCTL)
fi
])

AC_DEFUN(BASH_HAVE_FIONREAD,
[AC_MSG_CHECKING(for FIONREAD in sys/ioctl.h)
AC_CACHE_VAL(bash_cv_fionread_in_ioctl,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <sys/ioctl.h>], [int x = FIONREAD;],
  bash_cv_fionread_in_ioctl=yes,bash_cv_fionread_in_ioctl=no)])
AC_MSG_RESULT($bash_cv_fionread_in_ioctl)
if test $bash_cv_fionread_in_ioctl = yes; then   
AC_DEFINE(FIONREAD_IN_SYS_IOCTL)
fi
])

AC_DEFUN(BASH_CHECK_GETPW_FUNCS,
[AC_MSG_CHECKING(whether programs are able to redeclare getpw functions)
AC_CACHE_VAL(bash_cv_can_redecl_getpw,
[AC_TRY_COMPILE([#include <sys/types.h>
#include <pwd.h>
extern struct passwd *getpwent();], [struct passwd *z; z = getpwent();],
  bash_cv_can_redecl_getpw=yes,bash_cv_can_redecl_getpw=no)])
AC_MSG_RESULT($bash_cv_can_redecl_getpw)
if test $bash_cv_can_redecl_getpw = no; then
AC_DEFINE(HAVE_GETPW_DECLS)
fi
])

AC_DEFUN(BASH_CHECK_DEV_FD,
[AC_MSG_CHECKING(whether /dev/fd is available)
AC_CACHE_VAL(bash_cv_dev_fd,
[if test -d /dev/fd  && test -r /dev/fd/0; then
   bash_cv_dev_fd=standard
 elif test -d /proc/self/fd && test -r /proc/self/fd/0; then
   bash_cv_dev_fd=whacky
 else
   bash_cv_dev_fd=absent
 fi
])
AC_MSG_RESULT($bash_cv_dev_fd)
if test $bash_cv_dev_fd = "standard"; then
  AC_DEFINE(HAVE_DEV_FD)
  AC_DEFINE(DEV_FD_PREFIX, "/dev/fd/")
elif test $bash_cv_dev_fd = "whacky"; then
  AC_DEFINE(HAVE_DEV_FD)
  AC_DEFINE(DEV_FD_PREFIX, "/proc/self/fd/")
fi
])

AC_DEFUN(BASH_CHECK_SOCKLIB,
[
if test "X$bash_cv_have_socklib" = "X"; then
_bash_needmsg=
else
AC_MSG_CHECKING(for socket library)
_bash_needmsg=yes
fi
AC_CACHE_VAL(bash_cv_have_socklib,
[AC_CHECK_LIB(socket, getpeername,
        bash_cv_have_socklib=yes, bash_cv_have_socklib=no, -lnsl)])
if test "X$_bash_needmsg" = Xyes; then
  AC_MSG_RESULT($bash_cv_have_socklib)
  _bash_needmsg=
fi
if test $bash_cv_have_socklib = yes; then
  # check for libnsl, add it to LIBS if present
  if test "X$bash_cv_have_libnsl" = "X"; then
    _bash_needmsg=
  else
    AC_MSG_CHECKING(for libnsl)
    _bash_needmsg=yes
  fi
  AC_CACHE_VAL(bash_cv_have_libnsl,
	   [AC_CHECK_LIB(nsl, t_open,
		 bash_cv_have_libnsl=yes, bash_cv_have_libnsl=no)])
  if test "X$_bash_needmsg" = Xyes; then
    AC_MSG_RESULT($bash_cv_have_libnsl)
    _bash_needmsg=
  fi
  if test $bash_cv_have_libnsl = yes; then
    LIBS="-lsocket -lnsl $LIBS"
  else
    LIBS="-lsocket $LIBS"
  fi
  AC_DEFINE(HAVE_LIBSOCKET)
  AC_DEFINE(HAVE_GETPEERNAME)
fi
])

AC_DEFUN(BASH_DEFAULT_MAIL_DIR,
[AC_MSG_CHECKING(for default mail directory)
AC_CACHE_VAL(bash_cv_mail_dir,
[if test -d /var/mail; then
   bash_cv_mail_dir=/var/mail
 elif test -d /usr/mail; then
   bash_cv_mail_dir=/usr/mail
 elif test -d /usr/spool/mail; then
   bash_cv_mail_dir=/usr/spool/mail
 elif test -d /var/spool/mail; then
   bash_cv_mail_dir=/var/spool/mail
 else
   bash_cv_mail_dir=unknown
 fi
])
AC_MSG_RESULT($bash_cv_mail_dir)
if test $bash_cv_mail_dir = "/var/mail"; then
   AC_DEFINE(DEFAULT_MAIL_DIRECTORY, "/var/mail")
elif test $bash_cv_mail_dir = "/usr/mail"; then
   AC_DEFINE(DEFAULT_MAIL_DIRECTORY, "/usr/mail")
elif test $bash_cv_mail_dir = "/var/spool/mail"; then
   AC_DEFINE(DEFAULT_MAIL_DIRECTORY, "/var/spool/mail")
elif test $bash_cv_mail_dir = "/usr/spool/mail"; then
   AC_DEFINE(DEFAULT_MAIL_DIRECTORY, "/usr/spool/mail")
else
   AC_DEFINE(DEFAULT_MAIL_DIRECTORY, "unknown")
fi
])

dnl
dnl Check if HPUX needs _KERNEL defined for RLIMIT_* definitions
dnl
AC_DEFUN(BASH_KERNEL_RLIMIT_CHECK,
[AC_MSG_CHECKING([whether $host_os needs _KERNEL for RLIMIT defines])
AC_CACHE_VAL(bash_cv_kernel_rlimit,
[AC_TRY_COMPILE([
#include <sys/types.h>
#include <sys/resource.h>
],
[
  int f;
  f = RLIMIT_DATA;
], bash_cv_kernel_rlimit=no,
    [AC_TRY_COMPILE([
     #include <sys/types.h>
     #define _KERNEL
     #include <sys/resource.h>
     #undef _KERNEL
     ],
     [
	int f;
        f = RLIMIT_DATA;
     ], bash_cv_kernel_rlimit=yes, bash_cv_kernel_rlimit=no)]
)])
AC_MSG_RESULT($bash_cv_kernel_rlimit)
if test $bash_cv_kernel_rlimit = yes; then
AC_DEFINE(RLIMIT_NEEDS_KERNEL)
fi
])