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scst/README: Show how to read SCST sysfs attributes

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Make the behavior of SCST sysfs attributes more clear by adding
examples in scst/README of code for reading and writing these attributes.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>



git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@5340 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Vladislav Bolkhovitin
2014-03-19 04:28:46 +00:00
parent c43bf7e435
commit 20e99f16be
2 changed files with 64 additions and 2 deletions
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33
scst/README
View File

@@ -460,7 +460,38 @@ following entries:
complete, an management tool should poll this file. If the operation
hasn't yet completed, it will also return EAGAIN. But after it's
completed, it will return the result of this operation (0 for success
or -errno for error).
or -errno for error). The following two shell functions show how to do
this:
# Read the SCST sysfs attribute $1. See also scst/README for more information.
scst_sysfs_read() {
local EAGAIN val
EAGAIN="Resource temporarily unavailable"
while true; do
if val="$(LC_ALL=C cat "$1" 2>&1)"; then
echo -n "${val%\[key\]}"
return 0
elif [ "${val/*: }" != "$EAGAIN" ]; then
return 1
fi
sleep 1
done
}
# Write $1 into the SCST sysfs attribute $2. See also scst/README for more
# information.
scst_sysfs_write() {
local EAGAIN status
EAGAIN="Resource temporarily unavailable"
if status="$(LC_ALL=C; (echo -n "$1" > "$2") 2>&1)"; then
return 0
elif [ "${status/*: }" != "$EAGAIN" ]; then
return 1
fi
scst_sysfs_read /sys/kernel/scst_tgt/last_sysfs_mgmt_res >/dev/null
}
"Devices" subdirectory contains subdirectories for each SCST devices.

33
scst/README_in-tree
View File

@@ -322,7 +322,38 @@ following entries:
complete, an management tool should poll this file. If the operation
hasn't yet completed, it will also return EAGAIN. But after it's
completed, it will return the result of this operation (0 for success
or -errno for error).
or -errno for error). The following two shell functions show how to do
this:
# Read the SCST sysfs attribute $1. See also scst/README for more information.
scst_sysfs_read() {
local EAGAIN val
EAGAIN="Resource temporarily unavailable"
while true; do
if val="$(LC_ALL=C cat "$1" 2>&1)"; then
echo -n "${val%\[key\]}"
return 0
elif [ "${val/*: }" != "$EAGAIN" ]; then
return 1
fi
sleep 1
done
}
# Write $1 into the SCST sysfs attribute $2. See also scst/README for more
# information.
scst_sysfs_write() {
local EAGAIN status
EAGAIN="Resource temporarily unavailable"
if status="$(LC_ALL=C; (echo -n "$1" > "$2") 2>&1)"; then
return 0
elif [ "${status/*: }" != "$EAGAIN" ]; then
return 1
fi
scst_sysfs_read /sys/kernel/scst_tgt/last_sysfs_mgmt_res >/dev/null
}
"Devices" subdirectory contains subdirectories for each SCST devices.