summaryrefslogtreecommitdiffstats
path: root/lib/procps.lua
diff options
context:
space:
mode:
authorNatanael Copa <natanael.copa@gmail.com>2008-01-11 08:44:33 +0000
committerNatanael Copa <natanael.copa@gmail.com>2008-01-11 08:44:33 +0000
commit23938783e3bdde959751b17339fb57ccfc7a80d6 (patch)
tree7566650ec751d5a6caad4571a0eddadf4800053e /lib/procps.lua
parentea885afe7bd732c507c840d34300147632b46c76 (diff)
downloadacf-core-23938783e3bdde959751b17339fb57ccfc7a80d6.tar.bz2
acf-core-23938783e3bdde959751b17339fb57ccfc7a80d6.tar.xz
renamed pidof lib to procps. should be safe since noone is using it
git-svn-id: svn://svn.alpinelinux.org/acf/core/trunk@548 ab2d0c66-481e-0410-8bed-d214d4d58bed
Diffstat (limited to 'lib/procps.lua')
-rw-r--r--lib/procps.lua71
1 files changed, 71 insertions, 0 deletions
diff --git a/lib/procps.lua b/lib/procps.lua
new file mode 100644
index 0000000..d05ee14
--- /dev/null
+++ b/lib/procps.lua
@@ -0,0 +1,71 @@
+
+module(..., package.seeall)
+
+require("posix")
+
+-- the following methods are available:
+-- /proc/<pid>/stat the comm field (2nd) field contains name but only up
+-- to 15 chars. does not resolve links
+--
+-- /proc/<pid>/cmdline argv[0] contains the command. However if it is a script
+-- then will the interpreter show up
+--
+-- /proc/<pid>/exe link to exe file. this will resolv links
+--
+-- returns list of all pids for given exe name
+
+--[[
+-- gives lots of false positives for busybox
+local function is_exe(path, name)
+ local f = posix.readlink(path.."/exe")
+ if f and (f == name or posix.basename(f) == name) then
+ return true
+ else
+ return false
+ end
+end
+]]--
+
+
+local function is_stat(path, name)
+ local f = io.open(path.."/stat")
+ local line = f:read()
+ local p = string.match(line, "^%d+ %((%d+)%)")
+ f:close()
+ if p ~= nil and string.len(name) <= 15 and p == name then
+ return true
+ else
+ return false
+ end
+end
+
+local function is_cmdline(path, name)
+ local f = io.open(path.."/cmdline")
+ if f == nil then
+ return false
+ end
+ local line = f:read()
+ f:close()
+ if line == nil then
+ return false
+ end
+ local arg0 = string.gsub(line, string.char(0)..".*", "")
+ return posix.basename(arg0) == name
+end
+
+function pidof(name)
+ local pids = {}
+ local i, j
+
+ for i,j in pairs(posix.glob("/proc/[0-9]*")) do
+ local pid = tonumber(posix.basename(j))
+ if is_stat(j, name) or is_cmdline(j, name) then
+ table.insert(pids, pid)
+ end
+ end
+ if #pids == 0 then
+ pids = nil
+ end
+ return pids
+end
+