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|
# Handle varying sizes of procfs buffers.
set test "PROCFS_BUFFER"
if {![installtest_p]} { untested $test; return }
proc proc_read_value { test path} {
set value "<unknown>"
if [catch {open $path RDONLY} channel] {
fail "$test $channel"
} else {
set value [read -nonewline $channel]
close $channel
pass "$test read $value"
}
return $value
}
proc proc_write_value { test path value } {
if [catch {open $path WRONLY} channel] {
fail "$test $channel"
} else {
puts -nonewline $channel $value
close $channel
pass "$test wrote $value"
}
}
proc proc_read_write_counted { test maxsize } {
set path "/proc/systemtap/$test/command"
set fullstring "abcdefghijklmnoABCDEFGHIJKLMNOpqrstuvwxyz123456789"
# Read the file
set value [proc_read_value $test $path]
set value2 [string range $fullstring 0 [expr $maxsize - 2]]
if { $value == $value2 } {
pass "$test received correct initial value"
} else {
fail "$test received incorrect initial value: $value ($value2)"
}
# Write a new value.
proc_write_value $test $path $fullstring
return 0;
}
# Expect 32 byte return from reading procfs file.
proc proc_read_write_32 {} {
global test
proc_read_write_counted $test 32
}
# Expect 16 byte return from reading procfs file.
proc proc_read_write_16 {} {
global test
proc_read_write_counted $test 16
}
set script1 {
global values[10]
global idx = 0
probe procfs.read {
$value = "abcdefghijklmno"
$value .= "ABCDEFGHIJKLMNO"
$value .= "pqrstuvwxyz1234"
}
probe procfs.write {
values[idx] = $value
idx++
}
probe begin {
printf("systemtap starting probe\n")
}
probe end {
printf("systemtap ending probe\n")
for (i = 0; i < idx; i++) {
printf("value%d=%s\n", i, values[i])
}
}
}
# Output strings in 16 and 32 byte chunks.
set output_string_16 "value0=abcdefghijklmno\r\nvalue1=ABCDEFGHIJKLMNO\r\nvalue2=pqrstuvwxyz1234\r\nvalue3=56789\r\n"
set output_string_32 "value0=abcdefghijklmnoABCDEFGHIJKLMNOp\r\nvalue1=qrstuvwxyz123456789\r\n"
# By default, setting MAXSTRINGLEN should set the size of
# procfs read and write buffers.
set test "PROCFS_BUFFER1"
stap_run $test proc_read_write_32 $output_string_32 -DMAXSTRINGLEN=32 -e $script1 -m $test
exec /bin/rm -f ${test}.ko
# Try with MAXSTRINGLEN=32 and STP_PROCFS_BUFSIZE=16
set test "PROCFS_BUFFER2"
stap_run $test proc_read_write_16 $output_string_16 -DMAXSTRINGLEN=32 -DSTP_PROCFS_BUFSIZE=16 -e $script1 -m $test
exec /bin/rm -f ${test}.ko
# Try with MAXSTRINGLEN=16 and STP_PROCFS_BUFSIZE=32. Note that in
# this case, even though the procfs buffer is 32 bytes in size, since
# strings can only hold 16 bytes, the expected output is the same as
# in the previous test.
set test "PROCFS_BUFFER3"
stap_run $test proc_read_write_32 $output_string_16 -DMAXSTRINGLEN=16 -DSTP_PROCFS_BUFSIZE=32 -e $script1 -m $test
exec /bin/rm -f ${test}.ko
# script2 has a '.maxsize(32). override
set script2 {
global values[10]
global idx = 0
probe procfs.read.maxsize(32) {
$value = "abcdefghijklmno"
$value .= "ABCDEFGHIJKLMNO"
$value .= "pqrstuvwxyz1234"
}
probe procfs.write {
values[idx] = $value
idx++
}
probe begin {
printf("systemtap starting probe\n")
}
probe end {
printf("systemtap ending probe\n")
for (i = 0; i < idx; i++) {
printf("value%d=%s\n", i, values[i])
}
}
}
# By default, setting MAXSTRINGLEN should set the size of
# procfs read and write buffers. But script2 has a '.maxsize(32)'
# override.
set test "PROCFS_BUFFER4"
stap_run $test proc_read_write_32 $output_string_16 -DMAXSTRINGLEN=16 -e $script2 -m $test
exec /bin/rm -f ${test}.ko
# The script2 '.maxsize(32)' override should override even setting
# STP_PROCFS_BUFSIZE.
set test "PROCFS_BUFFER5"
stap_run $test proc_read_write_32 $output_string_16 -DMAXSTRINGLEN=16 -DSTP_PROCFS_BUFSIZE=64 -e $script2 -m $test
exec /bin/rm -f ${test}.ko
# script3 has a maxsize override and a default size file
set script3 {
global values[10]
global idx = 0
probe procfs("default").read {
$value = "abcdefghijklmno"
$value .= "ABCDEFGHIJKLMNO"
$value .= "pqrstuvwxyz1234"
}
probe procfs.read.maxsize(32) {
$value = "abcdefghijklmno"
$value .= "ABCDEFGHIJKLMNO"
$value .= "pqrstuvwxyz1234"
}
probe procfs.write {
values[idx] = $value
idx++
}
probe begin {
printf("systemtap starting probe\n")
}
probe end {
printf("systemtap ending probe\n")
for (i = 0; i < idx; i++) {
printf("value%d=%s\n", i, values[i])
}
}
}
proc proc_read_write_default_32 {} {
global test
set path "/proc/systemtap/$test/default"
set value2 "abcdefghijklmno"
# Read the file
set value [proc_read_value $test $path]
if { $value == $value2 } {
pass "$test received correct initial value"
} else {
fail "$test received incorrect initial value: $value ($value2)"
}
proc_read_write_counted $test 32
}
set test "PROCFS_BUFFER6"
stap_run $test proc_read_write_default_32 $output_string_16 -DMAXSTRINGLEN=16 -e $script3 -m $test
exec /bin/rm -f ${test}.ko
set script4 {
global large_strings[10]
# Put more data than we can really handle into $value
probe procfs.read.maxsize(2048) {
$value = large_strings[0]
for (i = 1; i < 10; i+=1) {
$value .= large_strings[i]
}
}
probe begin {
# build up several maximum length strings
max = 512
for (i = 0; i < max/64; i+=1) {
for (j = 0; j < 10; j++) {
if (i < (max/64 - 1)) {
large_strings[j] .= sprintf("%3d:12345678901234567890123456789012345678901234567890123456789\n",
i + (j * (max/64)))
}
else {
large_strings[j] .= sprintf("%3d:1234567890123456789012345678901234567890123456789012345678\n",
i + (j * (max/64)))
}
}
}
printf("systemtap starting probe\n")
}
probe end {
printf("systemtap ending probe\n")
}
}
proc proc_read_big {} {
global test
global test_string
set path "/proc/systemtap/$test/command"
# Read the file
set value [proc_read_value $test $path]
# set value2 [string range $fullstring 0 [expr $maxsize - 2]]
if { $value == $test_string } {
pass "$test received correct initial value"
} else {
fail "$test received incorrect initial value: $value ($test_string)"
}
return 0;
}
set test_string \
" 0:12345678901234567890123456789012345678901234567890123456789
1:12345678901234567890123456789012345678901234567890123456789
2:12345678901234567890123456789012345678901234567890123456789
3:12345678901234567890123456789012345678901234567890123456789
4:12345678901234567890123456789012345678901234567890123456789
5:12345678901234567890123456789012345678901234567890123456789
6:12345678901234567890123456789012345678901234567890123456789
7:1234567890123456789012345678901234567890123456789012345678
8:12345678901234567890123456789012345678901234567890123456789
9:12345678901234567890123456789012345678901234567890123456789
10:12345678901234567890123456789012345678901234567890123456789
11:12345678901234567890123456789012345678901234567890123456789
12:12345678901234567890123456789012345678901234567890123456789
13:12345678901234567890123456789012345678901234567890123456789
14:12345678901234567890123456789012345678901234567890123456789
15:1234567890123456789012345678901234567890123456789012345678
16:12345678901234567890123456789012345678901234567890123456789
17:12345678901234567890123456789012345678901234567890123456789
18:12345678901234567890123456789012345678901234567890123456789
19:12345678901234567890123456789012345678901234567890123456789
20:12345678901234567890123456789012345678901234567890123456789
21:12345678901234567890123456789012345678901234567890123456789
22:12345678901234567890123456789012345678901234567890123456789
23:1234567890123456789012345678901234567890123456789012345678
24:12345678901234567890123456789012345678901234567890123456789
25:12345678901234567890123456789012345678901234567890123456789
26:12345678901234567890123456789012345678901234567890123456789
27:12345678901234567890123456789012345678901234567890123456789
28:12345678901234567890123456789012345678901234567890123456789
29:12345678901234567890123456789012345678901234567890123456789
30:12345678901234567890123456789012345678901234567890123456789
31:1234567890123456789012345678901234567890123456789012345678
32"
# Test outputting 2K worth of data in one shot.
set test "PROCFS_BUFFER7"
stap_run $test proc_read_big "" -DMAXSTRINGLEN=512 -e $script4 -m $test
exec /bin/rm -f ${test}.ko
|
