From: Tanaka Akira <akr@...>
Date: 2006-09-01T07:06:58+09:00
Subject: [ruby-dev:29368] File.read produces \0 as the first byte.

File.read で /proc/self/status を読んだときに、最初のバイト
が \0 になります。

% ./ruby -ve 'p File.read("/proc/self/status")'
ruby 1.9.0 (2006-08-31) [i686-linux]
"\000ame:\truby\nState:\tR (running)\nSleepAVG:\t88%\nTgid:\t20549\nPid:\t20549\nPPid:\t10271\nTracerPid:\t0\nUid:\t1000\t1000\t1000\t1000\nGid:\t1000\t1000\t1000\t1000\nFDSize:\t32\nGroups:\t20 24 25 29 44 46 1000 \nVmPeak:\t    3220 kB\nVmSize:\t    3220 kB\nVmLck:\t       0 kB\nVmHWM:\t    1488 kB\nVmRSS:\t    1488 kB\nVmData:\t     752 kB\nVmStk:\t      84 kB\nVmExe:\t     848 kB\nVmLib:\t    1464 kB\nVmPTE:\t      12 kB\nThreads:\t1\nSigQ:\t0/4294967295\nSigPnd:\t0000000000000000\nShdPnd:\t0000000000000000\nSigBlk:\t0000000000000000\nSigIgn:\t0000000000000000\nSigCgt:\t0000000000003a07\nCapInh:\t0000000000000000\nCapPrm:\t0000000000000000\nCapEff:\t0000000000000000\n"

gets で読むとそうはなりません。

% ./ruby -e 'open("/proc/self/status") {|f| p f.gets }'
"Name:\truby\n"
-- 
[田中 哲][たなか あきら][Tanaka Akira]