https://perl5.git.perl.org / metaconfig.git / blame
| Commit | Line | Data |
|---|---|---|
| 959f3c4c JH |
1 | ?RCS: $Id: d_pidcheck.U,v 3.0.1.1 1997/02/28 15:37:55 ram Exp $ |
| 2 | ?RCS: | |
| 3 | ?RCS: Copyright (c) 1991-1993, Raphael Manfredi | |
| 4 | ?RCS: | |
| 5 | ?RCS: You may redistribute only under the terms of the Artistic Licence, | |
| 6 | ?RCS: as specified in the README file that comes with the distribution. | |
| 7 | ?RCS: You may reuse parts of this distribution only within the terms of | |
| 8 | ?RCS: that same Artistic Licence; a copy of which may be found at the root | |
| 9 | ?RCS: of the source tree for dist 3.0. | |
| 10 | ?RCS: | |
| 11 | ?RCS: $Log: d_pidcheck.U,v $ | |
| 12 | ?RCS: Revision 3.0.1.1 1997/02/28 15:37:55 ram | |
| 13 | ?RCS: patch61: replaced .o with $_o all over the place | |
| 14 | ?RCS: patch61: added ?F: metalint hint | |
| 15 | ?RCS: | |
| 16 | ?RCS: Revision 3.0 1993/08/18 12:06:46 ram | |
| 17 | ?RCS: Baseline for dist 3.0 netwide release. | |
| 18 | ?RCS: | |
| 19 | ?MAKE:d_pidcheck: cat rm +cc _o | |
| 20 | ?MAKE: -pick add $@ %< | |
| 21 | ?S:d_pidcheck: | |
| 22 | ?S: This variable conditionally defines the variable PIDCHECK | |
| 23 | ?S: which indicates that kill(pid, 0) will check for an active pid. | |
| 24 | ?S:. | |
| 25 | ?C:PIDCHECK: | |
| 26 | ?C: This symbol, if defined, means that the kill(pid, 0) will | |
| 27 | ?C: check for an active pid (i.e. the kernel will run all the | |
| 28 | ?C: necessary pid checks, but no signal is actually sent). | |
| 29 | ?C:. | |
| 30 | ?H:#$d_pidcheck PIDCHECK /**/ | |
| 31 | ?H:. | |
| 32 | ?F:!try | |
| 33 | : check for "kill(pid, 0)" | |
| 34 | echo " " | |
| 35 | case "$d_pidcheck" in | |
| 36 | "$define") | |
| 37 | echo "I already know your system supports kill(pid, 0) for pid checks." >&4 | |
| 38 | ;; | |
| 39 | "$undef") | |
| 40 | echo "We both know your system does not support signal #0 for pid checks." >&4 | |
| 41 | ;; | |
| 42 | *) | |
| 43 | echo "Checking to see if kill(pid, 0) works..." >&4 | |
| 44 | $cat >try.c <<'EOCP' | |
| 45 | main() | |
| 46 | { | |
| 47 | int pid, status0, status9; | |
| 48 | ||
| 49 | if ((pid = fork()) == 0) | |
| 50 | { | |
| 51 | sleep(30); | |
| 52 | exit(1); | |
| 53 | } | |
| 54 | status0 = kill(pid, 0); | |
| 55 | status9 = kill(pid, 9); | |
| 56 | exit(status0 == status9); | |
| 57 | } | |
| 58 | EOCP | |
| 59 | if $cc -o try try.c >/dev/null 2>&1 ; then | |
| 60 | if ./try >/dev/null 2>&1 ; then | |
| 61 | echo "Yes, it does marvels." | |
| 62 | d_pidcheck="$undef" | |
| 63 | else | |
| 64 | d_pidcheck="$define" | |
| 65 | echo "No, it doesn't." | |
| 66 | fi | |
| 67 | else | |
| 68 | echo "(I was unable to compile the test program.)" | |
| 69 | echo "Your system does not appear to support kill(pid, 0)." | |
| 70 | d_pidcheck="$undef" | |
| 71 | fi | |
| 72 | $rm -f try.c try$_o try | |
| 73 | ;; | |
| 74 | esac | |
| 75 |