https://perl5.git.perl.org / metaconfig.git / blame
| Commit | Line | Data |
|---|---|---|
| d8875586 MBT |
1 | ?RCS: $Id: d_eofpipe.U 1 2006-08-24 12:32:52Z rmanfredi $ |
| 2 | ?RCS: | |
| 3 | ?RCS: Copyright (c) 1991-1997, 2004-2006, 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 4.0. | |
| 10 | ?RCS: | |
| 11 | ?RCS: $Log: d_eofpipe.U,v $ | |
| 12 | ?RCS: Revision 3.0.1.1 1994/10/29 16:12:40 ram | |
| 13 | ?RCS: patch36: call ./bsd explicitly instead of relying on PATH | |
| 14 | ?RCS: | |
| 15 | ?RCS: Revision 3.0 1993/08/18 12:05:57 ram | |
| 16 | ?RCS: Baseline for dist 3.0 netwide release. | |
| 17 | ?RCS: | |
| 18 | ?MAKE:d_eofpipe: cat +cc +ccflags +libs rm Oldconfig Guess echo n c | |
| 19 | ?MAKE: -pick add $@ %< | |
| 20 | ?S:d_eofpipe: | |
| 21 | ?S: This variable conditionally defines the EOFPIPE symbol, which | |
| 22 | ?S: indicates to the C program that select will correctly detect the EOF | |
| 23 | ?S: condition when pipe is closed from the other end. | |
| 24 | ?S:. | |
| 25 | ?C:EOFPIPE: | |
| 26 | ?C: This symbol, if defined, indicates that EOF condition will be detected | |
| 27 | ?C: by the reader of the pipe when it is closed by the writing process. | |
| 28 | ?C: That is, a select() call on that file descriptor will not block when | |
| 29 | ?C: only an EOF remains (typical behaviour for BSD systems). | |
| 30 | ?C:. | |
| 31 | ?H:#$d_eofpipe EOFPIPE /**/ | |
| 32 | ?H:. | |
| 33 | ?F:!mpipe | |
| 34 | : see if pipe correctly gives the EOF condition | |
| 35 | echo " " | |
| 36 | case "$d_eofpipe" in | |
| 37 | '') | |
| 38 | echo "Let's see if your pipes return EOF to select() upon closing..." >&4 | |
| 39 | $cat >pipe.c <<'EOP' | |
| 40 | int main() | |
| 41 | { | |
| 42 | int pd[2]; | |
| 43 | int mask; | |
| 44 | ||
| 45 | pipe(pd); | |
| 46 | if (0 == fork()) { | |
| 47 | close(pd[0]); | |
| 48 | close(pd[1]); | |
| 49 | exit(0); | |
| 50 | } | |
| 51 | ||
| 52 | close(pd[1]); | |
| 53 | mask = 1 << pd[0]; | |
| 54 | alarm(2); | |
| 55 | select(32, &mask, (int *) 0, (int *) 0, (char *) 0); | |
| 56 | if (0 == read(pd[0], &mask, 1)) | |
| 57 | exit(0); | |
| 58 | ||
| 59 | exit(1); | |
| 60 | } | |
| 61 | EOP | |
| 62 | if $cc $ccflags -o pipe pipe.c $libs >/dev/null 2>&1; then | |
| 63 | ?X: Use a script to avoid the possible 'alarm call' message | |
| 64 | echo "./pipe || exit 1" > mpipe | |
| 65 | chmod +x mpipe | |
| 66 | ./mpipe >/dev/null 2>&1 | |
| 67 | case $? in | |
| 68 | 0) d_eofpipe="$define";; | |
| 69 | *) d_eofpipe="$undef";; | |
| 70 | esac | |
| 71 | else | |
| 72 | echo "(The test program did not compile correctly -- Guessing.)" | |
| 73 | if ./bsd; then | |
| 74 | d_eofpipe="$define" | |
| 75 | else | |
| 76 | d_eofpipe="$undef" | |
| 77 | fi | |
| 78 | fi | |
| 79 | case "$d_eofpipe" in | |
| 80 | "$define") echo "Yes, they do.";; | |
| 81 | *) echo "No, they don't! (sigh)";; | |
| 82 | esac | |
| 83 | ;; | |
| 84 | *) | |
| 85 | $echo $n "Your pipes $c" | |
| 86 | case "$d_eofpipe" in | |
| 87 | "$define") echo "allow select() to see EOF upon closing.";; | |
| 88 | *) echo "won't let select() see EOF on closing.";; | |
| 89 | esac | |
| 90 | ;; | |
| 91 | esac | |
| 92 | $rm -f *pipe* core | |
| 93 |