After applying the fix noted for the issue noted by CAI (and even
beforehand), I find that the testcase simply doesn't work (see below).
gcoo...@orangebox /scratch/ltp-dev2/ltp $ strace
testcases/kernel/syscalls/eventfd2/eventfd2_03
execve("testcases/kernel/syscalls/eventfd2/eventfd2_03",
["testcases/kernel/syscalls/eventf"...], [/* 46 vars */]) = 0
brk(0) = 0x1a8b000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0x7fcb728f1000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0x7fcb728f0000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=80124, ...}) = 0
mmap(NULL, 80124, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fcb728dc000
close(3) = 0
open("/lib/libc.so.6", O_RDONLY) = 3
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\340\346\1\0\0\0\0\0@"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1383600, ...}) = 0
mmap(NULL, 3490456, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x7fcb72381000
mprotect(0x7fcb724cc000, 2097152, PROT_NONE) = 0
mmap(0x7fcb726cc000, 20480, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x14b000) = 0x7fcb726cc000
mmap(0x7fcb726d1000, 17048, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fcb726d1000
close(3) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0x7fcb728db000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0x7fcb728da000
arch_prctl(ARCH_SET_FS, 0x7fcb728da6f0) = 0
mprotect(0x7fcb726cc000, 16384, PROT_READ) = 0
mprotect(0x603000, 4096, PROT_READ) = 0
mprotect(0x7fcb728f2000, 4096, PROT_READ) = 0
munmap(0x7fcb728dc000, 80124) = 0
uname({sys="Linux", node="orangebox", ...}) = 0
syscall_290(0, 0x1, 0xfffffffd, 0x1d, 0xa, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0) = -1 (errno 22)
dup(2) = 3
fcntl(3, F_GETFL) = 0x8002 (flags O_RDWR|O_LARGEFILE)
brk(0) = 0x1a8b000
brk(0x1aac000) = 0x1aac000
fstat(3, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0x7fcb728ef000
lseek(3, 0, SEEK_CUR) = -1 ESPIPE (Illegal seek)
write(3, "eventfd2: Invalid argument\n"..., 27eventfd2: Invalid argument
) = 27
close(3) = 0
munmap(0x7fcb728ef000, 4096) = 0
exit_group(1) = ?
Here's the code block where it errors out:
if ((fd1 = eventfd2(0, EFD_SEMLIKE)) == -1 ||
(fd2 = eventfd2(0, EFD_SEMLIKE)) == -1) {
perror("eventfd2");
return 1;
}
The manpage says it should return EINVAL for bad flags (because my
kernel's version is 2.6.29, which is newer than 2.6.27, the minimum
version). Doing a bit of research it looks like the values being fed
into eventfd2 are wrong, according to the documentation:
EFD_NONBLOCK Set the O_NONBLOCK file status flag on the new open file
description. Using this flag saves extra calls to
fcntl(2) to achieve the same result.
EFD_CLOEXEC Set the close-on-exec (FD_CLOEXEC) flag on the new file
descriptor. See the description of the O_CLOEXEC flag in
open(2) for reasons why this may be useful.
In Linux up to version 2.6.26, the flags argument is unused, and must
be specified as zero.
gcoo...@orangebox /scratch/ltp-dev2/ltp $ egrep -r
'EFD_NONBLOCK|EFD_CLOEXEC' /usr/include/sys/eventfd.h
EFD_CLOEXEC = 02000000,
#define EFD_CLOEXEC EFD_CLOEXEC
EFD_NONBLOCK = 04000
#define EFD_NONBLOCK EFD_NONBLOCK
gcoo...@orangebox /scratch/ltp-dev2/ltp $ egrep -r 'EFD_SEMLIKE'
/usr/include/sys/eventfd.h
gcoo...@orangebox /scratch/ltp-dev2/ltp $ grep -r 1 /usr/include/sys/eventfd.h
version 2.1 of the License, or (at your option) any later version.
02111-1307 USA. */
#define _SYS_EVENTFD_H 1
So, what should we define the flag to to fix this test, or should it
just be marked broken on 2.6.29?
Thanks,
-Garrett
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