91052d8b56
There are situations in test scripts where we want to keep open file descriptors while performing other commands. Bash has abilities to manage file descriptors by numbers, but the syntax is a little brain damaging. This library provides wrappers around it to abstract away bash's syntax and also provides a helper function to pick a free file descriptor on the fly. The APIs are pretty self explanatory. Change-Id: I82f1d1957646dd6c468d9e85c90ec30c978c7ad6 BUG: 764966 Signed-off-by: Anand Avati <avati@redhat.com> Reviewed-on: http://review.gluster.org/4565 Reviewed-by: Amar Tumballi <amarts@redhat.com>
62 lines
823 B
Bash
62 lines
823 B
Bash
#!/bin/bash
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function fd_available() {
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for i in {1..65536}; do
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if [ ! -e /proc/$$/fd/$i ]; then
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echo $i;
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return 0;
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fi
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done
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return 1;
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}
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function fd_open() {
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local fd=$1;
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local mode=$2
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local path=$3;
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case $mode in
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r)
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eval "exec $fd<$path";;
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w)
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eval "exec $fd>$path";;
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rw)
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eval "exec $fd<>$path";;
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*)
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false;;
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esac
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}
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function fd_cat() {
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local fd=$1;
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eval "cat <&$fd";
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}
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function fd_write() {
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local fd=$1;
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shift;
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local msg="$@";
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eval "echo $@ >&$fd";
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}
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function fd_close() {
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local fd=$1;
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eval "exec $fd>&-";
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}
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function fd_based_example() {
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TEST fd=`fd_available`;
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TEST fd_open $fd "rw" $M0/filename;
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TEST fd_cat $fd; # print existing stuff
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TEST fd_write $fd "new stuff"; # append
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TEST fd_close $fd;
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}
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