39 lines
1.1 KiB
Plaintext
Executable File
39 lines
1.1 KiB
Plaintext
Executable File
# Builds a " 3>&- 4>&-" string.
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# Note: one of these fds is a directory opened to /proc/self/fd
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# for globbing. It is unwanted, but I don't know how to filter it out.
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find_fds() {
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fds=""
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for f in /proc/self/fd/*; do
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test "$f" = "/proc/self/fd/0" && continue
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test "$f" = "/proc/self/fd/1" && continue
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test "$f" = "/proc/self/fd/2" && continue
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fds="$fds ${f##*/}>&-"
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done
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}
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find_fds
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fds1="$fds"
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# One of the fds is open to the script body
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# Close it while executing something.
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eval "find_fds $fds"
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# Shell should not lose that fd. Did it?
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find_fds
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test x"$fds1" = x"$fds" \
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&& { echo "Ok: script fd is not closed"; exit 0; }
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# One legit way to handle it is to move script fd. For example, if we see that fd 10 moved to fd 11:
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test x"$fds1" = x" 10>&- 3>&-" && \
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test x"$fds" = x" 11>&- 3>&-" \
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&& { echo "Ok: script fd is not closed"; exit 0; }
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# or we see that fd 3 moved to fd 10:
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test x"$fds1" = x" 3>&- 4>&-" && \
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test x"$fds" = x" 10>&- 3>&-" \
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&& { echo "Ok: script fd is not closed"; exit 0; }
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echo "Bug: script fd is closed"
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echo "fds1:$fds1"
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echo "fds2:$fds"
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exit 1
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