Aurelien Jarno wrote: > I am unable to reproduce the problem on a Debian 2.6.32-5 kernel. Could > it be that the kernel that you are using does not have CONFIG_EVENTFD > enabled? An strace of this test program could help to understand the > problem.
That seems likely. FWIW, the hosting provider with this kernel is
strato.de. I don't know if that's a significant provider in Germany.
(If it doesn't let users boot their own kernels, I hope not!)
joeyh@h1658901:~/tmp$ strace ./test
execve("./test", ["./test"], [/* 19 vars */]) = 0
brk(0) = 0x83e5000
uname({sys="Linux", node="h1658901.stratoserver.net", ...}) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb7f1c000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=38933, ...}) = 0
mmap2(NULL, 38933, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f12000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/i386-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3,
"\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\20\227\1\0004\0\0\0"..., 512)
= 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=1512872, ...}) = 0
mmap2(NULL, 1522332, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) =
0xb7d9e000
mmap2(0xb7f0c000, 12288, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x16e) = 0xb7f0c000
mmap2(0xb7f0f000, 10908, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb7f0f000
close(3) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb7d9d000
set_thread_area({entry_number:-1 -> 6, base_addr:0xb7d9d900, limit:1048575,
seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0,
useable:1}) = 0
mprotect(0xb7f0c000, 8192, PROT_READ) = 0
mprotect(0xb7f3d000, 4096, PROT_READ) = 0
munmap(0xb7f12000, 38933) = 0
eventfd2(10, 0) = -1 ENOSYS (Function not implemented)
dup(2) = 3
fcntl64(3, F_GETFL) = 0x8002 (flags O_RDWR|O_LARGEFILE)
brk(0) = 0x83e5000
brk(0x8406000) = 0x8406000
fstat64(3, {st_mode=S_IFCHR|0620, st_rdev=makedev(3, 1), ...}) = 0
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb7f1b000
_llseek(3, 0, 0xbf9ed1a8, SEEK_CUR) = -1 ESPIPE (Illegal seek)
write(3, "err: Function not implemented\n", 30err: Function not implemented
) = 30
close(3) = 0
munmap(0xb7f1b000, 4096) = 0
exit_group(0) = ?
--
see shy jo
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