Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: x86_64-pc-linux-gnu-gcc
Compilation CFLAGS: -O2 -pipe
uname output: Linux testserver 6.6.47-gentoo #1 SMP Tue Aug 20 09:38:16 CEST
2024 x86_64 Intel(R) Xeon(R) Gold 6242 CPU @ 2.80GHz GenuineIntel GNU/Linux
Machine Type: x86_64-pc-linux-gnu
Bash Version: 5.2
Patch Level: 26
Release Status: release
Description:
I have tried to write a bash script that asynchronously reads from a
pipe (line by line) with the help of "read -t".
If the timeout occurs in just the right moment, read returns the full line,
but the return code says timeout (rc > 128).
Therefor it is not possible to know if a full line was returned or not.
Please see the script in the Repeat-By section that reproduces the error in
seconds.
Repeat-By:
function reader() {
local buf line
while :; do
read -t .01 buf
rc=$?
if (( rc == 0 )); then
line+=$buf
elif (( rc > 128 )); then
line+=$buf
continue
fi
[[ $line != TEST ]] && echo Invalid line: $line && exit
echo OK
line=""
done
}
reader < <(
while :; do
echo -n TEST
sleep .00$(($RANDOM%10))
echo
done
)
