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From: Jan Beulich <jbeulich@suse.com>
To: Ian Jackson <ian.jackson@citrix.com>,
	Elliott Mitchell <ehem+xen@m5p.com>
Cc: Andrew Cooper <Andrew.Cooper3@citrix.com>,
	Paul Durrant <paul@xen.org>,
	"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
	Wei Liu <wl@xen.org>, Jason Andryuk <jandryuk@gmail.com>
Subject: Re: use of "stat -"
Date: Mon, 18 May 2020 12:34:28 +0200	[thread overview]
Message-ID: <0b449d5a-9629-8e41-5354-b985a063eba4@suse.com> (raw)
In-Reply-To: <24253.9543.974853.499775@mariner.uk.xensource.com>

[-- Attachment #1: Type: text/plain, Size: 963 bytes --]

On 14.05.2020 13:02, Ian Jackson wrote:
> I've read this thread.  Jan, I'm sorry that this causes you
> inconvenience.  I'm hoping it won't come down to a choice between
> supporting people who want to ship a dom0 without perl, and people who
> want a dom0 using more-than-a-decade-old coreutils.
> 
> Jan, can you tell me what the output is of this on your ancient
> system:
> 
>   $ rm -f t
>   $ >t
>   $ exec 3<t
>   $ stat -L -c '%F %i' /dev/stdin <&3
>   regular empty file 393549
>   $ rm t
>   $ stat -L -c '%F %i' /dev/stdin <&3
>   regular empty file 393549
>   $ strace -ou stat -L -c '%F %i' /dev/stdin <&3
>   $

$ rm -f t
$ >t
$ exec 3<t
$ stat -L -c '%F %i' /dev/stdin <&3
regular empty file 3380369
$ rm t
$ stat -L -c '%F %i' /dev/stdin <&3
regular empty file 3380369
$ strace -ou stat -L -c '%F %i' /dev/stdin <&3
regular empty file 3380369

> Also, the contents of the file "u" afterwards, please.

Attached.

Thanks for looking into this, Jan

[-- Attachment #2: u --]
[-- Type: text/plain, Size: 13502 bytes --]

execve("/usr/bin/stat", ["stat", "-L", "-c", "%F %i", "/dev/stdin"], [/* 89 vars */]) = 0
brk(0)                                  = 0x8bd000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fa332c89000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/usr/local/lib64/tls/x86_64/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/usr/local/lib64/tls/x86_64", 0x7fffe2b6ad70) = -1 ENOENT (No such file or directory)
open("/usr/local/lib64/tls/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/usr/local/lib64/tls", 0x7fffe2b6ad70) = -1 ENOENT (No such file or directory)
open("/usr/local/lib64/x86_64/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/usr/local/lib64/x86_64", 0x7fffe2b6ad70) = -1 ENOENT (No such file or directory)
open("/usr/local/lib64/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/usr/local/lib64", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
open("/usr/local/lib/tls/x86_64/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/usr/local/lib/tls/x86_64", 0x7fffe2b6ad70) = -1 ENOENT (No such file or directory)
open("/usr/local/lib/tls/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/usr/local/lib/tls", 0x7fffe2b6ad70) = -1 ENOENT (No such file or directory)
open("/usr/local/lib/x86_64/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/usr/local/lib/x86_64", 0x7fffe2b6ad70) = -1 ENOENT (No such file or directory)
open("/usr/local/lib/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/usr/local/lib", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
open("/opt/intel/compiler-8.1-026/lib/tls/x86_64/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/opt/intel/compiler-8.1-026/lib/tls/x86_64", 0x7fffe2b6ad70) = -1 ENOENT (No such file or directory)
open("/opt/intel/compiler-8.1-026/lib/tls/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/opt/intel/compiler-8.1-026/lib/tls", 0x7fffe2b6ad70) = -1 ENOENT (No such file or directory)
open("/opt/intel/compiler-8.1-026/lib/x86_64/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/opt/intel/compiler-8.1-026/lib/x86_64", 0x7fffe2b6ad70) = -1 ENOENT (No such file or directory)
open("/opt/intel/compiler-8.1-026/lib/libselinux.so.1", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/opt/intel/compiler-8.1-026/lib", 0x7fffe2b6ad70) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY)      = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=93598, ...}) = 0
mmap(NULL, 93598, PROT_READ, MAP_PRIVATE, 4, 0) = 0x7fa332c72000
close(4)                                = 0
open("/lib64/libselinux.so.1", O_RDONLY) = 4
read(4, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0_\0\0\0\0\0\0"..., 832) = 832
fstat(4, {st_mode=S_IFREG|0755, st_size=118080, ...}) = 0
mmap(NULL, 2217768, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 4, 0) = 0x7fa33284e000
fadvise64(4, 0, 2217768, POSIX_FADV_WILLNEED) = 0
mprotect(0x7fa33286a000, 2093056, PROT_NONE) = 0
mmap(0x7fa332a69000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 4, 0x1b000) = 0x7fa332a69000
mmap(0x7fa332a6b000, 1832, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fa332a6b000
close(4)                                = 0
open("/usr/local/lib64/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/local/lib/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/lib64/libc.so.6", O_RDONLY)      = 4
read(4, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0@\355\1\0\0\0\0\0"..., 832) = 832
fstat(4, {st_mode=S_IFREG|0755, st_size=1690993, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fa332c71000
mmap(NULL, 3557448, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 4, 0) = 0x7fa3324e9000
fadvise64(4, 0, 3557448, POSIX_FADV_WILLNEED) = 0
mprotect(0x7fa332645000, 2093056, PROT_NONE) = 0
mmap(0x7fa332844000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 4, 0x15b000) = 0x7fa332844000
mmap(0x7fa332849000, 18504, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fa332849000
close(4)                                = 0
open("/usr/local/lib64/libdl.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/local/lib/libdl.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/lib64/libdl.so.2", O_RDONLY)     = 4
read(4, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\360\r\0\0\0\0\0\0"..., 832) = 832
fstat(4, {st_mode=S_IFREG|0755, st_size=19149, ...}) = 0
mmap(NULL, 2109696, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 4, 0) = 0x7fa3322e5000
fadvise64(4, 0, 2109696, POSIX_FADV_WILLNEED) = 0
mprotect(0x7fa3322e7000, 2097152, PROT_NONE) = 0
mmap(0x7fa3324e7000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 4, 0x2000) = 0x7fa3324e7000
close(4)                                = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fa332c70000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fa332c6e000
arch_prctl(ARCH_SET_FS, 0x7fa332c6e7a0) = 0
mprotect(0x7fa3324e7000, 4096, PROT_READ) = 0
mprotect(0x7fa332844000, 16384, PROT_READ) = 0
mprotect(0x7fa332a69000, 4096, PROT_READ) = 0
mprotect(0x609000, 4096, PROT_READ)     = 0
mprotect(0x7fa332c8a000, 4096, PROT_READ) = 0
munmap(0x7fa332c72000, 93598)           = 0
statfs("/selinux", {f_type="EXT2_SUPER_MAGIC", f_bsize=4096, f_blocks=5126165, f_bfree=4641521, f_bavail=4379461, f_files=1310720, f_ffree=1241977, f_fsid={-304735720, 1406917494}, f_namelen=255, f_frsize=4096}) = 0
brk(0)                                  = 0x8bd000
brk(0x8de000)                           = 0x8de000
open("/proc/filesystems", O_RDONLY)     = 4
fstat(4, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fa332c88000
read(4, "nodev\tsysfs\nnodev\trootfs\nnodev\tr"..., 1024) = 265
read(4, "", 1024)                       = 0
close(4)                                = 0
munmap(0x7fa332c88000, 4096)            = 0
open("/usr/lib/locale/locale-archive", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/locale.alias", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=2512, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fa332c88000
read(4, "# Locale name alias data base.\n#"..., 4096) = 2512
read(4, "", 4096)                       = 0
close(4)                                = 0
munmap(0x7fa332c88000, 4096)            = 0
open("/usr/lib/locale/en_US.UTF-8/LC_IDENTIFICATION", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_IDENTIFICATION", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=373, ...}) = 0
mmap(NULL, 373, PROT_READ, MAP_PRIVATE, 4, 0) = 0x7fa332c88000
close(4)                                = 0
open("/usr/lib64/gconv/gconv-modules.cache", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=26050, ...}) = 0
mmap(NULL, 26050, PROT_READ, MAP_SHARED, 4, 0) = 0x7fa332c81000
close(4)                                = 0
open("/usr/lib/locale/en_US.UTF-8/LC_MEASUREMENT", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_MEASUREMENT", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=23, ...}) = 0
mmap(NULL, 23, PROT_READ, MAP_PRIVATE, 4, 0) = 0x7fa332c80000
close(4)                                = 0
open("/usr/lib/locale/en_US.UTF-8/LC_TELEPHONE", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_TELEPHONE", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=59, ...}) = 0
mmap(NULL, 59, PROT_READ, MAP_PRIVATE, 4, 0) = 0x7fa332c7f000
close(4)                                = 0
open("/usr/lib/locale/en_US.UTF-8/LC_ADDRESS", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_ADDRESS", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=155, ...}) = 0
mmap(NULL, 155, PROT_READ, MAP_PRIVATE, 4, 0) = 0x7fa332c7e000
close(4)                                = 0
open("/usr/lib/locale/en_US.UTF-8/LC_NAME", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_NAME", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=77, ...}) = 0
mmap(NULL, 77, PROT_READ, MAP_PRIVATE, 4, 0) = 0x7fa332c7d000
close(4)                                = 0
open("/usr/lib/locale/en_US.UTF-8/LC_PAPER", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_PAPER", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=34, ...}) = 0
mmap(NULL, 34, PROT_READ, MAP_PRIVATE, 4, 0) = 0x7fa332c7c000
close(4)                                = 0
open("/usr/lib/locale/en_US.UTF-8/LC_MESSAGES", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_MESSAGES", O_RDONLY) = 4
fstat(4, {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
close(4)                                = 0
open("/usr/lib/locale/en_US.utf8/LC_MESSAGES/SYS_LC_MESSAGES", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=57, ...}) = 0
mmap(NULL, 57, PROT_READ, MAP_PRIVATE, 4, 0) = 0x7fa332c7b000
close(4)                                = 0
open("/usr/lib/locale/en_US.UTF-8/LC_MONETARY", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_MONETARY", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=286, ...}) = 0
mmap(NULL, 286, PROT_READ, MAP_PRIVATE, 4, 0) = 0x7fa332c7a000
close(4)                                = 0
open("/usr/lib/locale/en_US.UTF-8/LC_COLLATE", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_COLLATE", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=1163682, ...}) = 0
mmap(NULL, 1163682, PROT_READ, MAP_PRIVATE, 4, 0) = 0x7fa332b51000
close(4)                                = 0
open("/usr/lib/locale/en_US.UTF-8/LC_TIME", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_TIME", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=2454, ...}) = 0
mmap(NULL, 2454, PROT_READ, MAP_PRIVATE, 4, 0) = 0x7fa332c79000
close(4)                                = 0
open("/usr/lib/locale/en_US.UTF-8/LC_NUMERIC", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_NUMERIC", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=54, ...}) = 0
mmap(NULL, 54, PROT_READ, MAP_PRIVATE, 4, 0) = 0x7fa332c78000
close(4)                                = 0
open("/usr/lib/locale/en_US.UTF-8/LC_CTYPE", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib/locale/en_US.utf8/LC_CTYPE", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=256324, ...}) = 0
mmap(NULL, 256324, PROT_READ, MAP_PRIVATE, 4, 0) = 0x7fa332b12000
close(4)                                = 0
stat("/dev/stdin", {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
open("/usr/share/locale-langpack/en_US.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-bundle/en_US.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en_US.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-bundle/en_US.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en_US/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-bundle/en_US/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-bundle/en.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-bundle/en.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-bundle/en/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
fstat(1, {st_mode=S_IFCHR|0600, st_rdev=makedev(136, 4), ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fa332c77000
write(1, "regular empty file 3380369\n", 27) = 27
close(1)                                = 0
munmap(0x7fa332c77000, 4096)            = 0
close(2)                                = 0
exit_group(0)                           = ?

  parent reply	other threads:[~2020-05-18 10:34 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-12 10:58 use of "stat -" Jan Beulich
2020-05-12 14:19 ` Wei Liu
2020-05-12 14:33   ` Jan Beulich
2020-05-12 14:47     ` Andrew Cooper
2020-05-12 14:59       ` Jan Beulich
2020-05-12 15:52         ` Jason Andryuk
2020-05-12 19:50           ` Elliott Mitchell
2020-05-12 19:54             ` Andrew Cooper
2020-05-12 22:54               ` Elliott Mitchell
2020-05-14 11:02                 ` Ian Jackson
2020-05-14 12:39                   ` Jan Beulich
2020-05-18 10:34                   ` Jan Beulich [this message]
2020-06-24 15:55                     ` Ping: " Jan Beulich
2020-06-24 16:19                     ` [XEN RFC for-4.14] " Ian Jackson
2020-06-25  2:37                       ` Jason Andryuk
2020-06-25  7:05                         ` Jan Beulich
2020-06-25 12:04                           ` Jason Andryuk
2020-06-25 13:31                           ` Ian Jackson
2020-06-25 13:48                             ` Jan Beulich
2020-06-25 14:16                               ` Jason Andryuk
2020-06-25  7:27                         ` Rich Persaud
2020-06-25 13:27                         ` Ian Jackson
2020-06-25 14:08                           ` Jan Beulich
2020-06-25 14:18                             ` Jason Andryuk
2020-06-25 14:37                               ` Ian Jackson
2020-06-25 14:19                             ` Ian Jackson
2020-06-25  7:03                       ` Paul Durrant

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