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Test whether /dev/zero works before attemping to us it

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This commit is contained in:
Michael Meissner
1996-08-12 23:06:21 +00:00
parent d9538961cc
commit 9aecf50da5
3 changed files with 45 additions and 1 deletions
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28
sim/ppc/configure.in
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@ -593,6 +593,33 @@ else
ac_cv_termio_cline=no
fi
dnl Figure out if /dev/zero exists or not
sim_devzero=""
AC_MSG_CHECKING(for /dev/zero)
AC_CACHE_VAL(ac_cv_devzero,
[AC_TRY_RUN([#include <fcntl.h>
main () {
char buf[2048];
int i;
int fd = open ("/dev/zero", O_RDONLY);
if (fd < 0)
return 1;
for (i = 0; i < sizeof (buf); i++)
buf[i] = 1;
if (read (fd, buf, sizeof (buf)) != sizeof (buf))
return 1;
for (i = 0; i < sizeof (buf); i++)
if (buf[i])
return 1;
return 0;
}],[ac_cv_devzero=yes],[ac_cv_devzero=no],[ac_cv_devzero=no])])
AC_MSG_RESULT($ac_cv_devzero)
if test $ac_cv_devzero = yes; then
sim_devzero="-DHAVE_DEVZERO"
else
sim_devzero=""
fi
AC_SUBST(CC_FOR_BUILD)
AC_SUBST(CFLAGS)
AC_SUBST(HDEFINES)
@ -637,6 +664,7 @@ AC_SUBST(sim_default_model)
AC_SUBST(sim_model_issue)
AC_SUBST(sim_stdio)
AC_SUBST(sim_termio)
AC_SUBST(sim_devzero)
AC_OUTPUT(Makefile,
[case x$CONFIG_HEADERS in xconfig.h:config.in) echo > stamp-h ;; esac])