| Message ID | 20240217164846.1837223-1-flaviocruz@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | Use proc_getchildren_rusage when available in getrusage and times. | expand |
Looks much nicer, applied, thanks! :D Flavio Cruz, le sam. 17 févr. 2024 11:48:46 -0500, a ecrit: > --- > config.h.in | 3 + > sysdeps/mach/hurd/configure | 174 +++++++++++++++++++++++++++++++++ > sysdeps/mach/hurd/configure.ac | 19 ++++ > sysdeps/mach/hurd/getrusage.c | 8 +- > sysdeps/mach/hurd/times.c | 18 +++- > 5 files changed, 219 insertions(+), 3 deletions(-) > > diff --git a/config.h.in b/config.h.in > index 44a34072..2f0669e1 100644 > --- a/config.h.in > +++ b/config.h.in > @@ -159,6 +159,9 @@ > /* Mach/i386 specific: define if the `i386_set_gdt' RPC is available. */ > #undef HAVE_I386_SET_GDT > > +/* Hurd specific; define if the `proc_getchildren_rusage' RPC is available. */ > +#undef HAVE_HURD_PROC_GETCHILDREN_RUSAGE > + > /* Define if inlined system calls are available. */ > #undef HAVE_INLINED_SYSCALLS > > diff --git a/sysdeps/mach/hurd/configure b/sysdeps/mach/hurd/configure > index 33d3e1fc..cd5af1cd 100644 > --- a/sysdeps/mach/hurd/configure > +++ b/sysdeps/mach/hurd/configure > @@ -45,6 +45,180 @@ if test "x$libc_cv_hurd_version" != xok; then > as_fn_error $? "Hurd headers not installed or too old" "$LINENO" 5 > fi > > + > + > + > +{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for grep that handles long lines and -e" >&5 > +printf %s "checking for grep that handles long lines and -e... " >&6; } > +if test ${ac_cv_path_GREP+y} > +then : > + printf %s "(cached) " >&6 > +else $as_nop > + if test -z "$GREP"; then > + ac_path_GREP_found=false > + # Loop through the user's path and test for each of PROGNAME-LIST > + as_save_IFS=$IFS; IFS=$PATH_SEPARATOR > +for as_dir in $PATH$PATH_SEPARATOR/usr/xpg4/bin > +do > + IFS=$as_save_IFS > + case $as_dir in #((( > + '') as_dir=./ ;; > + */) ;; > + *) as_dir=$as_dir/ ;; > + esac > + for ac_prog in grep ggrep > + do > + for ac_exec_ext in '' $ac_executable_extensions; do > + ac_path_GREP="$as_dir$ac_prog$ac_exec_ext" > + as_fn_executable_p "$ac_path_GREP" || continue > +# Check for GNU ac_path_GREP and select it if it is found. > + # Check for GNU $ac_path_GREP > +case `"$ac_path_GREP" --version 2>&1` in > +*GNU*) > + ac_cv_path_GREP="$ac_path_GREP" ac_path_GREP_found=:;; > +*) > + ac_count=0 > + printf %s 0123456789 >"conftest.in" > + while : > + do > + cat "conftest.in" "conftest.in" >"conftest.tmp" > + mv "conftest.tmp" "conftest.in" > + cp "conftest.in" "conftest.nl" > + printf "%s\n" 'GREP' >> "conftest.nl" > + "$ac_path_GREP" -e 'GREP$' -e '-(cannot match)-' < "conftest.nl" >"conftest.out" 2>/dev/null || break > + diff "conftest.out" "conftest.nl" >/dev/null 2>&1 || break > + as_fn_arith $ac_count + 1 && ac_count=$as_val > + if test $ac_count -gt ${ac_path_GREP_max-0}; then > + # Best one so far, save it but keep looking for a better one > + ac_cv_path_GREP="$ac_path_GREP" > + ac_path_GREP_max=$ac_count > + fi > + # 10*(2^10) chars as input seems more than enough > + test $ac_count -gt 10 && break > + done > + rm -f conftest.in conftest.tmp conftest.nl conftest.out;; > +esac > + > + $ac_path_GREP_found && break 3 > + done > + done > + done > +IFS=$as_save_IFS > + if test -z "$ac_cv_path_GREP"; then > + as_fn_error $? "no acceptable grep could be found in $PATH$PATH_SEPARATOR/usr/xpg4/bin" "$LINENO" 5 > + fi > +else > + ac_cv_path_GREP=$GREP > +fi > + > +fi > +{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_path_GREP" >&5 > +printf "%s\n" "$ac_cv_path_GREP" >&6; } > + GREP="$ac_cv_path_GREP" > + > + > +{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for egrep" >&5 > +printf %s "checking for egrep... " >&6; } > +if test ${ac_cv_path_EGREP+y} > +then : > + printf %s "(cached) " >&6 > +else $as_nop > + if echo a | $GREP -E '(a|b)' >/dev/null 2>&1 > + then ac_cv_path_EGREP="$GREP -E" > + else > + if test -z "$EGREP"; then > + ac_path_EGREP_found=false > + # Loop through the user's path and test for each of PROGNAME-LIST > + as_save_IFS=$IFS; IFS=$PATH_SEPARATOR > +for as_dir in $PATH$PATH_SEPARATOR/usr/xpg4/bin > +do > + IFS=$as_save_IFS > + case $as_dir in #((( > + '') as_dir=./ ;; > + */) ;; > + *) as_dir=$as_dir/ ;; > + esac > + for ac_prog in egrep > + do > + for ac_exec_ext in '' $ac_executable_extensions; do > + ac_path_EGREP="$as_dir$ac_prog$ac_exec_ext" > + as_fn_executable_p "$ac_path_EGREP" || continue > +# Check for GNU ac_path_EGREP and select it if it is found. > + # Check for GNU $ac_path_EGREP > +case `"$ac_path_EGREP" --version 2>&1` in > +*GNU*) > + ac_cv_path_EGREP="$ac_path_EGREP" ac_path_EGREP_found=:;; > +*) > + ac_count=0 > + printf %s 0123456789 >"conftest.in" > + while : > + do > + cat "conftest.in" "conftest.in" >"conftest.tmp" > + mv "conftest.tmp" "conftest.in" > + cp "conftest.in" "conftest.nl" > + printf "%s\n" 'EGREP' >> "conftest.nl" > + "$ac_path_EGREP" 'EGREP$' < "conftest.nl" >"conftest.out" 2>/dev/null || break > + diff "conftest.out" "conftest.nl" >/dev/null 2>&1 || break > + as_fn_arith $ac_count + 1 && ac_count=$as_val > + if test $ac_count -gt ${ac_path_EGREP_max-0}; then > + # Best one so far, save it but keep looking for a better one > + ac_cv_path_EGREP="$ac_path_EGREP" > + ac_path_EGREP_max=$ac_count > + fi > + # 10*(2^10) chars as input seems more than enough > + test $ac_count -gt 10 && break > + done > + rm -f conftest.in conftest.tmp conftest.nl conftest.out;; > +esac > + > + $ac_path_EGREP_found && break 3 > + done > + done > + done > +IFS=$as_save_IFS > + if test -z "$ac_cv_path_EGREP"; then > + as_fn_error $? "no acceptable egrep could be found in $PATH$PATH_SEPARATOR/usr/xpg4/bin" "$LINENO" 5 > + fi > +else > + ac_cv_path_EGREP=$EGREP > +fi > + > + fi > +fi > +{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_path_EGREP" >&5 > +printf "%s\n" "$ac_cv_path_EGREP" >&6; } > + EGREP="$ac_cv_path_EGREP" > + > + > +{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for proc_getchildren_rusage in process.defs" >&5 > +printf %s "checking for proc_getchildren_rusage in process.defs... " >&6; } > +if test ${libc_cv_hurd_rpc_proc_getchildren_rusage+y} > +then : > + printf %s "(cached) " >&6 > +else $as_nop > + cat confdefs.h - <<_ACEOF >conftest.$ac_ext > +/* end confdefs.h. */ > +#include <hurd/process.defs> > + > +_ACEOF > +if (eval "$ac_cpp conftest.$ac_ext") 2>&5 | > + $EGREP "proc_getchildren_rusage" >/dev/null 2>&1 > +then : > + libc_cv_hurd_rpc_proc_getchildren_rusage=yes > +else $as_nop > + libc_cv_hurd_rpc_proc_getchildren_rusage=no > +fi > +rm -rf conftest* > + > +fi > +{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_hurd_rpc_proc_getchildren_rusage" >&5 > +printf "%s\n" "$libc_cv_hurd_rpc_proc_getchildren_rusage" >&6; } > +if test $libc_cv_hurd_rpc_proc_getchildren_rusage = yes; then > + printf "%s\n" "#define HAVE_HURD_PROC_GETCHILDREN_RUSAGE 1" >>confdefs.h > + > +fi > + > + > if test -n "$sysheaders"; then > CPPFLAGS=$OLD_CPPFLAGS > fi > diff --git a/sysdeps/mach/hurd/configure.ac b/sysdeps/mach/hurd/configure.ac > index 82d085af..1695e94e 100644 > --- a/sysdeps/mach/hurd/configure.ac > +++ b/sysdeps/mach/hurd/configure.ac > @@ -23,6 +23,25 @@ if test "x$libc_cv_hurd_version" != xok; then > AC_MSG_ERROR(Hurd headers not installed or too old) > fi > > +dnl > +dnl hurd_RPC_CHECK(interface.defs, rpc_method, define) > +dnl > +dnl Check if rpc_method RPC is defined by interface.defs > +dnl and define `define`. > +dnl > +AC_DEFUN([hurd_RPC_CHECK], [dnl > +AC_CACHE_CHECK(for $2 in $1, libc_cv_hurd_rpc_$2, [dnl > +AC_EGREP_HEADER($2, hurd/$1, > + libc_cv_hurd_rpc_$2=yes, > + libc_cv_hurd_rpc_$2=no)]) > +if test $libc_cv_hurd_rpc_$2 = yes; then > + AC_DEFINE([$3]) > +fi > +]) > + > +hurd_RPC_CHECK(process.defs, proc_getchildren_rusage, > + HAVE_HURD_PROC_GETCHILDREN_RUSAGE) > + > if test -n "$sysheaders"; then > CPPFLAGS=$OLD_CPPFLAGS > fi > diff --git a/sysdeps/mach/hurd/getrusage.c b/sysdeps/mach/hurd/getrusage.c > index 7be4dd17..8151c297 100644 > --- a/sysdeps/mach/hurd/getrusage.c > +++ b/sysdeps/mach/hurd/getrusage.c > @@ -75,9 +75,13 @@ __getrusage (enum __rusage_who who, struct rusage *usage) > break; > > case RUSAGE_CHILDREN: > - /* XXX Not implemented yet. However, zero out USAGE to be > - consistent with the wait3 and wait4 functions. */ > +#ifdef HAVE_HURD_PROC_GETCHILDREN_RUSAGE > + err = __USEPORT (PROC, __proc_getchildren_rusage (port, usage)); > + if (err) > + return __hurd_fail (err); > +#else > memset (usage, 0, sizeof (struct rusage)); > +#endif > > break; > > diff --git a/sysdeps/mach/hurd/times.c b/sysdeps/mach/hurd/times.c > index 0c3880d5..3e384dd6 100644 > --- a/sysdeps/mach/hurd/times.c > +++ b/sysdeps/mach/hurd/times.c > @@ -32,6 +32,13 @@ clock_from_time_value (const time_value_t *t) > return t->seconds * 1000000 + t->microseconds; > } > > +#ifdef HAVE_HURD_PROC_GETCHILDREN_RUSAGE > +static inline clock_t > +clock_from_timeval (const struct timeval *t) { > + return t->tv_sec * 1000000 + t->tv_usec; > +} > +#endif > + > /* Store the CPU time used by this process and all its > dead children (and their dead children) in BUFFER. > Return the elapsed real time, or (clock_t) -1 for errors. > @@ -62,8 +69,17 @@ __times (struct tms *tms) > tms->tms_stime = (clock_from_time_value (&bi.system_time) > + clock_from_time_value (&tti.system_time)); > > - /* XXX This can't be implemented until getrusage(RUSAGE_CHILDREN) can be. */ > +#ifdef HAVE_HURD_PROC_GETCHILDREN_RUSAGE > + struct rusage child_rusage; > + err = __USEPORT (PROC, __proc_getchildren_rusage (port, &child_rusage)); > + if (err) > + return __hurd_fail (err); > + > + tms->tms_cutime = clock_from_timeval (&child_rusage.ru_utime); > + tms->tms_cstime = clock_from_timeval (&child_rusage.ru_stime); > +#else > tms->tms_cutime = tms->tms_cstime = 0; > +#endif > > __host_get_time (__mach_host_self (), &now); > > -- > 2.39.2 >
diff --git a/config.h.in b/config.h.in index 44a34072..2f0669e1 100644 --- a/config.h.in +++ b/config.h.in @@ -159,6 +159,9 @@ /* Mach/i386 specific: define if the `i386_set_gdt' RPC is available. */ #undef HAVE_I386_SET_GDT +/* Hurd specific; define if the `proc_getchildren_rusage' RPC is available. */ +#undef HAVE_HURD_PROC_GETCHILDREN_RUSAGE + /* Define if inlined system calls are available. */ #undef HAVE_INLINED_SYSCALLS diff --git a/sysdeps/mach/hurd/configure b/sysdeps/mach/hurd/configure index 33d3e1fc..cd5af1cd 100644 --- a/sysdeps/mach/hurd/configure +++ b/sysdeps/mach/hurd/configure @@ -45,6 +45,180 @@ if test "x$libc_cv_hurd_version" != xok; then as_fn_error $? "Hurd headers not installed or too old" "$LINENO" 5 fi + + + +{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for grep that handles long lines and -e" >&5 +printf %s "checking for grep that handles long lines and -e... " >&6; } +if test ${ac_cv_path_GREP+y} +then : + printf %s "(cached) " >&6 +else $as_nop + if test -z "$GREP"; then + ac_path_GREP_found=false + # Loop through the user's path and test for each of PROGNAME-LIST + as_save_IFS=$IFS; IFS=$PATH_SEPARATOR +for as_dir in $PATH$PATH_SEPARATOR/usr/xpg4/bin +do + IFS=$as_save_IFS + case $as_dir in #((( + '') as_dir=./ ;; + */) ;; + *) as_dir=$as_dir/ ;; + esac + for ac_prog in grep ggrep + do + for ac_exec_ext in '' $ac_executable_extensions; do + ac_path_GREP="$as_dir$ac_prog$ac_exec_ext" + as_fn_executable_p "$ac_path_GREP" || continue +# Check for GNU ac_path_GREP and select it if it is found. + # Check for GNU $ac_path_GREP +case `"$ac_path_GREP" --version 2>&1` in +*GNU*) + ac_cv_path_GREP="$ac_path_GREP" ac_path_GREP_found=:;; +*) + ac_count=0 + printf %s 0123456789 >"conftest.in" + while : + do + cat "conftest.in" "conftest.in" >"conftest.tmp" + mv "conftest.tmp" "conftest.in" + cp "conftest.in" "conftest.nl" + printf "%s\n" 'GREP' >> "conftest.nl" + "$ac_path_GREP" -e 'GREP$' -e '-(cannot match)-' < "conftest.nl" >"conftest.out" 2>/dev/null || break + diff "conftest.out" "conftest.nl" >/dev/null 2>&1 || break + as_fn_arith $ac_count + 1 && ac_count=$as_val + if test $ac_count -gt ${ac_path_GREP_max-0}; then + # Best one so far, save it but keep looking for a better one + ac_cv_path_GREP="$ac_path_GREP" + ac_path_GREP_max=$ac_count + fi + # 10*(2^10) chars as input seems more than enough + test $ac_count -gt 10 && break + done + rm -f conftest.in conftest.tmp conftest.nl conftest.out;; +esac + + $ac_path_GREP_found && break 3 + done + done + done +IFS=$as_save_IFS + if test -z "$ac_cv_path_GREP"; then + as_fn_error $? "no acceptable grep could be found in $PATH$PATH_SEPARATOR/usr/xpg4/bin" "$LINENO" 5 + fi +else + ac_cv_path_GREP=$GREP +fi + +fi +{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_path_GREP" >&5 +printf "%s\n" "$ac_cv_path_GREP" >&6; } + GREP="$ac_cv_path_GREP" + + +{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for egrep" >&5 +printf %s "checking for egrep... " >&6; } +if test ${ac_cv_path_EGREP+y} +then : + printf %s "(cached) " >&6 +else $as_nop + if echo a | $GREP -E '(a|b)' >/dev/null 2>&1 + then ac_cv_path_EGREP="$GREP -E" + else + if test -z "$EGREP"; then + ac_path_EGREP_found=false + # Loop through the user's path and test for each of PROGNAME-LIST + as_save_IFS=$IFS; IFS=$PATH_SEPARATOR +for as_dir in $PATH$PATH_SEPARATOR/usr/xpg4/bin +do + IFS=$as_save_IFS + case $as_dir in #((( + '') as_dir=./ ;; + */) ;; + *) as_dir=$as_dir/ ;; + esac + for ac_prog in egrep + do + for ac_exec_ext in '' $ac_executable_extensions; do + ac_path_EGREP="$as_dir$ac_prog$ac_exec_ext" + as_fn_executable_p "$ac_path_EGREP" || continue +# Check for GNU ac_path_EGREP and select it if it is found. + # Check for GNU $ac_path_EGREP +case `"$ac_path_EGREP" --version 2>&1` in +*GNU*) + ac_cv_path_EGREP="$ac_path_EGREP" ac_path_EGREP_found=:;; +*) + ac_count=0 + printf %s 0123456789 >"conftest.in" + while : + do + cat "conftest.in" "conftest.in" >"conftest.tmp" + mv "conftest.tmp" "conftest.in" + cp "conftest.in" "conftest.nl" + printf "%s\n" 'EGREP' >> "conftest.nl" + "$ac_path_EGREP" 'EGREP$' < "conftest.nl" >"conftest.out" 2>/dev/null || break + diff "conftest.out" "conftest.nl" >/dev/null 2>&1 || break + as_fn_arith $ac_count + 1 && ac_count=$as_val + if test $ac_count -gt ${ac_path_EGREP_max-0}; then + # Best one so far, save it but keep looking for a better one + ac_cv_path_EGREP="$ac_path_EGREP" + ac_path_EGREP_max=$ac_count + fi + # 10*(2^10) chars as input seems more than enough + test $ac_count -gt 10 && break + done + rm -f conftest.in conftest.tmp conftest.nl conftest.out;; +esac + + $ac_path_EGREP_found && break 3 + done + done + done +IFS=$as_save_IFS + if test -z "$ac_cv_path_EGREP"; then + as_fn_error $? "no acceptable egrep could be found in $PATH$PATH_SEPARATOR/usr/xpg4/bin" "$LINENO" 5 + fi +else + ac_cv_path_EGREP=$EGREP +fi + + fi +fi +{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_path_EGREP" >&5 +printf "%s\n" "$ac_cv_path_EGREP" >&6; } + EGREP="$ac_cv_path_EGREP" + + +{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for proc_getchildren_rusage in process.defs" >&5 +printf %s "checking for proc_getchildren_rusage in process.defs... " >&6; } +if test ${libc_cv_hurd_rpc_proc_getchildren_rusage+y} +then : + printf %s "(cached) " >&6 +else $as_nop + cat confdefs.h - <<_ACEOF >conftest.$ac_ext +/* end confdefs.h. */ +#include <hurd/process.defs> + +_ACEOF +if (eval "$ac_cpp conftest.$ac_ext") 2>&5 | + $EGREP "proc_getchildren_rusage" >/dev/null 2>&1 +then : + libc_cv_hurd_rpc_proc_getchildren_rusage=yes +else $as_nop + libc_cv_hurd_rpc_proc_getchildren_rusage=no +fi +rm -rf conftest* + +fi +{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_hurd_rpc_proc_getchildren_rusage" >&5 +printf "%s\n" "$libc_cv_hurd_rpc_proc_getchildren_rusage" >&6; } +if test $libc_cv_hurd_rpc_proc_getchildren_rusage = yes; then + printf "%s\n" "#define HAVE_HURD_PROC_GETCHILDREN_RUSAGE 1" >>confdefs.h + +fi + + if test -n "$sysheaders"; then CPPFLAGS=$OLD_CPPFLAGS fi diff --git a/sysdeps/mach/hurd/configure.ac b/sysdeps/mach/hurd/configure.ac index 82d085af..1695e94e 100644 --- a/sysdeps/mach/hurd/configure.ac +++ b/sysdeps/mach/hurd/configure.ac @@ -23,6 +23,25 @@ if test "x$libc_cv_hurd_version" != xok; then AC_MSG_ERROR(Hurd headers not installed or too old) fi +dnl +dnl hurd_RPC_CHECK(interface.defs, rpc_method, define) +dnl +dnl Check if rpc_method RPC is defined by interface.defs +dnl and define `define`. +dnl +AC_DEFUN([hurd_RPC_CHECK], [dnl +AC_CACHE_CHECK(for $2 in $1, libc_cv_hurd_rpc_$2, [dnl +AC_EGREP_HEADER($2, hurd/$1, + libc_cv_hurd_rpc_$2=yes, + libc_cv_hurd_rpc_$2=no)]) +if test $libc_cv_hurd_rpc_$2 = yes; then + AC_DEFINE([$3]) +fi +]) + +hurd_RPC_CHECK(process.defs, proc_getchildren_rusage, + HAVE_HURD_PROC_GETCHILDREN_RUSAGE) + if test -n "$sysheaders"; then CPPFLAGS=$OLD_CPPFLAGS fi diff --git a/sysdeps/mach/hurd/getrusage.c b/sysdeps/mach/hurd/getrusage.c index 7be4dd17..8151c297 100644 --- a/sysdeps/mach/hurd/getrusage.c +++ b/sysdeps/mach/hurd/getrusage.c @@ -75,9 +75,13 @@ __getrusage (enum __rusage_who who, struct rusage *usage) break; case RUSAGE_CHILDREN: - /* XXX Not implemented yet. However, zero out USAGE to be - consistent with the wait3 and wait4 functions. */ +#ifdef HAVE_HURD_PROC_GETCHILDREN_RUSAGE + err = __USEPORT (PROC, __proc_getchildren_rusage (port, usage)); + if (err) + return __hurd_fail (err); +#else memset (usage, 0, sizeof (struct rusage)); +#endif break; diff --git a/sysdeps/mach/hurd/times.c b/sysdeps/mach/hurd/times.c index 0c3880d5..3e384dd6 100644 --- a/sysdeps/mach/hurd/times.c +++ b/sysdeps/mach/hurd/times.c @@ -32,6 +32,13 @@ clock_from_time_value (const time_value_t *t) return t->seconds * 1000000 + t->microseconds; } +#ifdef HAVE_HURD_PROC_GETCHILDREN_RUSAGE +static inline clock_t +clock_from_timeval (const struct timeval *t) { + return t->tv_sec * 1000000 + t->tv_usec; +} +#endif + /* Store the CPU time used by this process and all its dead children (and their dead children) in BUFFER. Return the elapsed real time, or (clock_t) -1 for errors. @@ -62,8 +69,17 @@ __times (struct tms *tms) tms->tms_stime = (clock_from_time_value (&bi.system_time) + clock_from_time_value (&tti.system_time)); - /* XXX This can't be implemented until getrusage(RUSAGE_CHILDREN) can be. */ +#ifdef HAVE_HURD_PROC_GETCHILDREN_RUSAGE + struct rusage child_rusage; + err = __USEPORT (PROC, __proc_getchildren_rusage (port, &child_rusage)); + if (err) + return __hurd_fail (err); + + tms->tms_cutime = clock_from_timeval (&child_rusage.ru_utime); + tms->tms_cstime = clock_from_timeval (&child_rusage.ru_stime); +#else tms->tms_cutime = tms->tms_cstime = 0; +#endif __host_get_time (__mach_host_self (), &now);