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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 $value"
}
}
set fullstring "1bcdefghijklmno2BCDEFGHIJKLMNO3qrstuvwxyz12344QRSTUVWXYZ12345bcdefghijklmno6BCDEFGHIJKLMNO7qrstuvwxyz12348QRSTUVWXYZ12340BCDEFGHIJKLMNO1qrstuvwxyz12342QRSTUVWXYZ1234"
proc proc_read_write_counted { test maxsize } {
global fullstring
set path "/proc/systemtap/$test/command"
# Read the file
set value [proc_read_value $test $path]
set value2 [string range $fullstring 0 [expr $maxsize - 2]]
if { $value == $value2 } {
pass "$test received correct initial value maxsize: $maxsize"
} else {
fail "$test received incorrect initial value: $value ($value2)"
}
# Write a new value.
proc_write_value $test $path $fullstring
return 0;
}
# Expect 80 byte return from reading procfs file.
proc proc_read_write_80 {} {
global test
proc_read_write_counted $test 80
}
# Expect 64 byte return from reading procfs file.
proc proc_read_write_64 {} {
global test
proc_read_write_counted $test 64
}
set script1 {
global values[10]
global idx = 0
probe procfs.read {
try {
$value = "1bcdefghijklmno"
$value .= "2BCDEFGHIJKLMNO"
$value .= "3qrstuvwxyz1234"
$value .= "4QRSTUVWXYZ1234"
$value .= "5bcdefghijklmno"
$value .= "6BCDEFGHIJKLMNO"
$value .= "7qrstuvwxyz1234"
$value .= "8QRSTUVWXYZ1234"
$value .= "9bcdefghijklmno"
$value .= "0BCDEFGHIJKLMNO"
$value .= "1qrstuvwxyz1234"
$value .= "2QRSTUVWXYZ1234"
} catch {
}
}
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 64 and 80 byte chunks.
set output_string_64 "value0=1bcdefghijklmno2BCDEFGHIJKLMNO3qrstuvwxyz12344QRSTUVWXYZ12345bc\r\nvalue1=defghijklmno6BCDEFGHIJKLMNO7qrstuvwxyz12348QRSTUVWXYZ12340BCDEF\r\nvalue2=GHIJKLMNO1qrstuvwxyz12342QRSTUVWXYZ1234\r\n"
set output_string_80 "value0=1bcdefghijklmno2BCDEFGHIJKLMNO3qrstuvwxyz12344QRSTUVWXYZ12345bcdefghijklmno6BCD\r\nvalue1=EFGHIJKLMNO7qrstuvwxyz12348QRSTUVWXYZ12340BCDEFGHIJKLMNO1qrstuvwxyz12342QRSTUVW\r\nvalue2=XYZ1234\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_80 $output_string_80 -DMAXSTRINGLEN=80 -e $script1 -m $test
exec /bin/rm -f ${test}.ko
# Try with MAXSTRINGLEN=80 and STP_PROCFS_BUFSIZE=64
set test "PROCFS_BUFFER2"
stap_run $test proc_read_write_64 $output_string_64 -DMAXSTRINGLEN=80 -DSTP_PROCFS_BUFSIZE=64 -e $script1 -m $test
exec /bin/rm -f ${test}.ko
# Try with MAXSTRINGLEN=64 and STP_PROCFS_BUFSIZE=80. Note that in
# this case, even though the procfs buffer is 80 bytes in size, since
# strings can only hold 64 bytes, the expected output is the same as
# in the previous test.
set test "PROCFS_BUFFER3"
stap_run $test proc_read_write_80 $output_string_64 -DMAXSTRINGLEN=64 -DSTP_PROCFS_BUFSIZE=80 -e $script1 -m $test
exec /bin/rm -f ${test}.ko
# script2 has a '.maxsize(80). override
set script2 {
global values[10]
global idx = 0
probe procfs.read.maxsize(80) {
try {
$value = "1bcdefghijklmno"
$value .= "2BCDEFGHIJKLMNO"
$value .= "3qrstuvwxyz1234"
$value .= "4QRSTUVWXYZ1234"
$value .= "5bcdefghijklmno"
$value .= "6BCDEFGHIJKLMNO"
$value .= "7qrstuvwxyz1234"
$value .= "8QRSTUVWXYZ1234"
$value .= "9bcdefghijklmno"
$value .= "0BCDEFGHIJKLMNO"
$value .= "1qrstuvwxyz1234"
$value .= "2QRSTUVWXYZ1234"
} catch {
}
}
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(80)'
# override.
set test "PROCFS_BUFFER4"
stap_run $test proc_read_write_80 $output_string_64 -DMAXSTRINGLEN=64 -e $script2 -m $test
exec /bin/rm -f ${test}.ko
# The script2 '.maxsize(80)' override should override even setting
# STP_PROCFS_BUFSIZE.
set test "PROCFS_BUFFER5"
stap_run $test proc_read_write_80 $output_string_64 -DMAXSTRINGLEN=64 -DSTP_PROCFS_BUFSIZE=80 -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 {
try {
$value = "1bcdefghijklmno"
$value .= "2BCDEFGHIJKLMNO"
$value .= "3qrstuvwxyz1234"
$value .= "4QRSTUVWXYZ1234"
$value .= "5bcdefghijklmno"
$value .= "6BCDEFGHIJKLMNO"
$value .= "7qrstuvwxyz1234"
$value .= "8QRSTUVWXYZ1234"
$value .= "9bcdefghijklmno"
$value .= "0BCDEFGHIJKLMNO"
$value .= "1qrstuvwxyz1234"
$value .= "2QRSTUVWXYZ1234"
} catch {
}
}
probe procfs.read.maxsize(80) {
try {
$value = "1bcdefghijklmno"
$value .= "2BCDEFGHIJKLMNO"
$value .= "3qrstuvwxyz1234"
$value .= "4QRSTUVWXYZ1234"
$value .= "5bcdefghijklmno"
$value .= "6BCDEFGHIJKLMNO"
$value .= "7qrstuvwxyz1234"
$value .= "8QRSTUVWXYZ1234"
$value .= "9bcdefghijklmno"
$value .= "0BCDEFGHIJKLMNO"
$value .= "1qrstuvwxyz1234"
$value .= "2QRSTUVWXYZ1234"
} catch {
}
}
probe procfs.write {
values[idx] = $value
idx++
}
probe begin {
printf("systemtap starting probe\n")
}
probe end {
printf("systemtap ending probe\n")
for (i = 0; i < idx; i++) {
printf("value%d=%s\n", i, values[i])
}
}
}
proc proc_read_write_default_80 {} {
global test
global fullstring
set path "/proc/systemtap/$test/default"
set value2 [string range $fullstring 0 62]
# 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 80
}
set test "PROCFS_BUFFER6"
stap_run $test proc_read_write_default_80 $output_string_64 -DMAXSTRINGLEN=64 -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) {
try {
$value = large_strings[0]
for (i = 1; i < 10; i+=1) {
$value .= large_strings[i]
}
} catch {
}
}
probe begin {
# build up several maximum length strings
max = 512
for (i = 0; i < max/64; i+=1) {
for (j = 0; j < 10; j++) {
if (i < (max/64 - 1)) {
large_strings[j] .= sprintf("%3d:12345678901234567890123456789012345678901234567890123456789\n",
i + (j * (max/64)))
}
else {
large_strings[j] .= sprintf("%3d:1234567890123456789012345678901234567890123456789012345678\n",
i + (j * (max/64)))
}
}
}
printf("systemtap starting probe\n")
}
probe end {
printf("systemtap ending probe\n")
}
}
proc proc_read_big {} {
global test
global test_string
set path "/proc/systemtap/$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
# Expect 72 byte return from reading procfs file.
proc proc_read_write_72 {} {
global test
proc_read_write_counted $test 72
}
set script5 {
global error
probe procfs.read {
try {
$value = "1bcdefghijklmno"
$value .= "2BCDEFGHIJKLMNO"
$value .= "3qrstuvwxyz1234"
$value .= "4QRSTUVWXYZ1234"
$value .= "5bcdefghijk"
} catch (err) {
error = err
}
}
probe procfs.write {
next
}
probe begin {
printf("systemtap starting probe\n")
}
probe end {
printf("systemtap ending probe\n")
println(error)
}
}
set overflow_string "buffer size exceeded, consider .maxsize\\(72\\).\r\n"
# Buffer too small
set test "PROCFS_BUFFER8"
stap_run $test proc_read_write_64 $overflow_string -DSTP_PROCFS_BUFSIZE=64 -e $script5 -m $test
exec /bin/rm -f ${test}.ko
# Buffer is exactly large enough to hold contents
set test "PROCFS_BUFFER9"
stap_run $test proc_read_write_72 "\r\n" -DSTP_PROCFS_BUFSIZE=72 -e $script5 -m $test
exec /bin/rm -f ${test}.ko
|
