Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 19 Sep 2002 12:47:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 19 Sep 2002 12:47:48 -0400 Received: from e6.ny.us.ibm.com ([32.97.182.106]:19132 "EHLO e6.ny.us.ibm.com") by vger.kernel.org with ESMTP id ; Thu, 19 Sep 2002 12:47:46 -0400 From: Badari Pulavarty Message-Id: <200209191652.g8JGqgv10535@eng2.beaverton.ibm.com> Subject: /dev/null broken in 2.5.36 ? To: linux-kernel@vger.kernel.org Date: Thu, 19 Sep 2002 09:52:42 -0700 (PDT) X-Mailer: ELM [version 2.5 PL3] MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6698 Lines: 130 /dev/null seems to be broken in 2.5.36 (and also 2.5.35) [root@elm3b81 root]# uname -a Linux elm3b81 2.5.36 #0 SMP Thu Sep 19 09:11:08 PDT 2002 i686 unknown [root@elm3b81 root]# dd if=/dev/null of=/tmp/file bs=512 count=100 0+0 records in 0+0 records out [root@elm3b81 root]# ls -l /tmp/file -rw-r--r-- 1 root root 0 Sep 19 09:28 /tmp/file [root@elm3b81 root]# ls -l /dev/null crw-rw-rw- 1 root root 1, 3 Aug 30 2001 /dev/null Here is the strace: ------------------- As you can from strace output, read on /dev/null returned "0" bytes. I wonder why ? execve("/bin/dd", ["dd", "if=/dev/null", "of=/tmp/file", "bs=512", "count=100"], [/* 23 vars */]) = 0 uname({sys="Linux", node="elm3b81", ...}) = 0 brk(0) = 0x8050000 open("/etc/ld.so.preload", O_RDONLY) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=56456, ...}) = 0 old_mmap(NULL, 56456, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40017000 close(3) = 0 open("/lib/i686/libc.so.6", O_RDONLY) = 3 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0 \306\1"..., 1024) = 1024 fstat64(3, {st_mode=S_IFREG|0755, st_size=5772268, ...}) = 0 old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40025000 old_mmap(NULL, 1290088, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40026000 mprotect(0x40158000, 36712, PROT_NONE) = 0 old_mmap(0x40158000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x131000) = 0x40158000 old_mmap(0x4015d000, 16232, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x4015d000 close(3) = 0 munmap(0x40017000, 56456) = 0 brk(0) = 0x8050000 brk(0x8050028) = 0x8050028 brk(0x8051000) = 0x8051000 open("/usr/share/locale/locale.alias", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=2601, ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40017000 read(3, "# Locale name alias data base.\n#"..., 4096) = 2601 read(3, "", 4096) = 0 close(3) = 0 munmap(0x40017000, 4096) = 0 open("/usr/lib/locale/en_US/LC_IDENTIFICATION", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=370, ...}) = 0 mmap2(NULL, 370, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40017000 close(3) = 0 open("/usr/lib/locale/en_US/LC_MEASUREMENT", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=28, ...}) = 0 mmap2(NULL, 28, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40018000 close(3) = 0 open("/usr/lib/locale/en_US/LC_TELEPHONE", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=64, ...}) = 0 mmap2(NULL, 64, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40019000 close(3) = 0 open("/usr/lib/locale/en_US/LC_ADDRESS", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=160, ...}) = 0 mmap2(NULL, 160, PROT_READ, MAP_PRIVATE, 3, 0) = 0x4001a000 close(3) = 0 open("/usr/lib/locale/en_US/LC_NAME", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=82, ...}) = 0 mmap2(NULL, 82, PROT_READ, MAP_PRIVATE, 3, 0) = 0x4001b000 brk(0x8052000) = 0x8052000 close(3) = 0 open("/usr/lib/locale/en_US/LC_PAPER", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=39, ...}) = 0 fstat64(3, {st_mode=S_IFREG|0644, st_size=39, ...}) = 0 mmap2(NULL, 39, PROT_READ, MAP_PRIVATE, 3, 0) = 0x4001c000 close(3) = 0 open("/usr/lib/locale/en_US/LC_MESSAGES", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 close(3) = 0 open("/usr/lib/locale/en_US/LC_MESSAGES/SYS_LC_MESSAGES", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=57, ...}) = 0 mmap2(NULL, 57, PROT_READ, MAP_PRIVATE, 3, 0) = 0x4001d000 close(3) = 0 open("/usr/lib/locale/en_US/LC_MONETARY", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=291, ...}) = 0 mmap2(NULL, 291, PROT_READ, MAP_PRIVATE, 3, 0) = 0x4001e000 close(3) = 0 open("/usr/lib/locale/en_US/LC_COLLATE", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=21499, ...}) = 0 mmap2(NULL, 21499, PROT_READ, MAP_PRIVATE, 3, 0) = 0x4001f000 close(3) = 0 open("/usr/lib/locale/en_US/LC_TIME", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=2456, ...}) = 0 mmap2(NULL, 2456, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40161000 close(3) = 0 open("/usr/lib/locale/en_US/LC_NUMERIC", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=59, ...}) = 0 mmap2(NULL, 59, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40162000 close(3) = 0 open("/usr/lib/locale/en_US/LC_CTYPE", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=173408, ...}) = 0 mmap2(NULL, 173408, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40163000 close(3) = 0 close(0) = 0 open("/dev/null", O_RDONLY|O_LARGEFILE) = 0 close(1) = 0 open("/tmp/file", O_WRONLY|O_CREAT|O_TRUNC|O_LARGEFILE, 0666) = 1 fstat64(1, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0 rt_sigaction(SIGINT, NULL, {SIG_DFL}, 8) = 0 rt_sigaction(SIGINT, {0x80494f0, [], 0x4000000}, NULL, 8) = 0 rt_sigaction(SIGQUIT, NULL, {SIG_DFL}, 8) = 0 rt_sigaction(SIGQUIT, {0x80494f0, [], 0x4000000}, NULL, 8) = 0 rt_sigaction(SIGPIPE, NULL, {SIG_DFL}, 8) = 0 rt_sigaction(SIGPIPE, {0x80494f0, [], 0x4000000}, NULL, 8) = 0 rt_sigaction(SIGUSR1, NULL, {SIG_DFL}, 8) = 0 rt_sigaction(SIGUSR1, {0x8049550, [], 0x4000000}, NULL, 8) = 0 brk(0x8055000) = 0x8055000 read(0, "", 512) = 0 <<<<<<<<<<<<<<<<<<<<<<<<<********* open("/usr/share/locale/en_US/LC_MESSAGES/fileutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/share/locale/en/LC_MESSAGES/fileutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory) write(2, "0+0 records in\n", 15) = 15 write(2, "0+0 records out\n", 16) = 16 close(0) = 0 close(1) = 0 _exit(0) = ? 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