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Diffstat (limited to 'mcon/U/d_pidcheck.U')
| -rw-r--r-- | mcon/U/d_pidcheck.U | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/mcon/U/d_pidcheck.U b/mcon/U/d_pidcheck.U new file mode 100644 index 0000000..6744334 --- /dev/null +++ b/mcon/U/d_pidcheck.U @@ -0,0 +1,75 @@ +?RCS: $Id$ +?RCS: +?RCS: Copyright (c) 1991-1997, 2004-2006, Raphael Manfredi +?RCS: +?RCS: You may redistribute only under the terms of the Artistic Licence, +?RCS: as specified in the README file that comes with the distribution. +?RCS: You may reuse parts of this distribution only within the terms of +?RCS: that same Artistic Licence; a copy of which may be found at the root +?RCS: of the source tree for dist 4.0. +?RCS: +?RCS: $Log: d_pidcheck.U,v $ +?RCS: Revision 3.0.1.1 1997/02/28 15:37:55 ram +?RCS: patch61: replaced .o with $_o all over the place +?RCS: patch61: added ?F: metalint hint +?RCS: +?RCS: Revision 3.0 1993/08/18 12:06:46 ram +?RCS: Baseline for dist 3.0 netwide release. +?RCS: +?MAKE:d_pidcheck: cat rm +cc _o +?MAKE: -pick add $@ %< +?S:d_pidcheck: +?S: This variable conditionally defines the variable PIDCHECK +?S: which indicates that kill(pid, 0) will check for an active pid. +?S:. +?C:PIDCHECK: +?C: This symbol, if defined, means that the kill(pid, 0) will +?C: check for an active pid (i.e. the kernel will run all the +?C: necessary pid checks, but no signal is actually sent). +?C:. +?H:#$d_pidcheck PIDCHECK /**/ +?H:. +?F:!try +: check for "kill(pid, 0)" +echo " " +case "$d_pidcheck" in +"$define") +echo "I already know your system supports kill(pid, 0) for pid checks." >&4 + ;; +"$undef") +echo "We both know your system does not support signal #0 for pid checks." >&4 + ;; +*) + echo "Checking to see if kill(pid, 0) works..." >&4 + $cat >try.c <<'EOCP' +int main() + { + int pid, status0, status9; + + if ((pid = fork()) == 0) + { + sleep(30); + exit(1); + } + status0 = kill(pid, 0); + status9 = kill(pid, 9); + exit(status0 == status9); + } +EOCP + if $cc -o try try.c >/dev/null 2>&1 ; then + if ./try >/dev/null 2>&1 ; then + echo "Yes, it does marvels." + d_pidcheck="$undef" + else + d_pidcheck="$define" + echo "No, it doesn't." + fi + else + echo "(I was unable to compile the test program.)" + echo "Your system does not appear to support kill(pid, 0)." + d_pidcheck="$undef" + fi + $rm -f try.c try$_o try + ;; +esac + |