clock_nanosleep with clockid CLOCK_REALTIME fails with error EINVAL

[traversaro]

• Your Windows build number:

Microsoft Windows [Version 10.0.15063]

• What you're doing and what's happening:
  I am calling clock_nanosleep with clockid CLOCK_REALTIME, and the call fails with error EINVAL.

A self-contained example can be found in https://gist.github.com/traversaro/c2b6941ef2ddd10e9dd6c1800483696a .
On my system, the corresponding output is:

traversaro@system:~/src/clockid_wsl_test/build$ ./clockid_wsl_test
Error macros values:
EINTR : 4
EINVAL: 22
ENOTSUP: 95
Testing CLOCK_MONOTONIC
clock_getres return value: 0 with errno 0
clock_gettime return value: 0
clock_nanosleep return value: 0
Testing CLOCK_REALTIME
clock_getres return value: 0 with errno 0
clock_gettime return value: 0
clock_nanosleep return value: 22
Testing CLOCK_PROCESS_CPUTIME_ID
clock_getres return value: -1 with errno 22
clock_gettime return value: 0
clock_nanosleep return value: 22
Testing CLOCK_THREAD_CPUTIME_ID
clock_getres return value: -1 with errno 22
clock_gettime return value: 0
clock_nanosleep return value: 22

• What's wrong / what should be happening instead:
  The call should be successful, and sleep (at least) for the specified amount of time.

• Strace of the failing command, if applicable:

execve("./clockid_wsl_test", ["./clockid_wsl_test"], [/* 18 vars */]) = 0
brk(NULL)                               = 0x680000
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc541a30000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=54863, ...}) = 0
mmap(NULL, 54863, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fc541a22000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/usr/lib/x86_64-linux-gnu/libstdc++.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0 \235\10\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=1566440, ...}) = 0
mmap(NULL, 3675136, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fc541270000
mprotect(0x7fc5413e2000, 2097152, PROT_NONE) = 0
mmap(0x7fc5415e2000, 49152, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x172000) = 0x7fc5415e2000
mmap(0x7fc5415ee000, 13312, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fc5415ee000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\t\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1868984, ...}) = 0
mmap(NULL, 3971488, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fc540ea0000
mprotect(0x7fc541060000, 2097152, PROT_NONE) = 0
mmap(0x7fc541260000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1c0000) = 0x7fc541260000
mmap(0x7fc541266000, 14752, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fc541266000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libm.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0V\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=1088952, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc541a20000
mmap(NULL, 3178744, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fc540b90000
mprotect(0x7fc540c98000, 2093056, PROT_NONE) = 0
mmap(0x7fc540e97000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x107000) = 0x7fc540e97000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libgcc_s.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0p*\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=89696, ...}) = 0
mmap(NULL, 2185488, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fc540970000
mprotect(0x7fc540986000, 2093056, PROT_NONE) = 0
mmap(0x7fc540b85000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x15000) = 0x7fc540b85000
close(3)                                = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc541a10000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc541a00000
arch_prctl(ARCH_SET_FS, 0x7fc541a00740) = 0
mprotect(0x7fc541260000, 16384, PROT_READ) = 0
mprotect(0x7fc540e97000, 4096, PROT_READ) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc5419f0000
mprotect(0x7fc5415e2000, 40960, PROT_READ) = 0
mprotect(0x601000, 4096, PROT_READ)     = 0
mprotect(0x7fc541825000, 4096, PROT_READ) = 0
munmap(0x7fc541a22000, 54863)           = 0
brk(NULL)                               = 0x680000
brk(0x6b2000)                           = 0x6b2000
write(2, "Error macros values: ", 21)   = 21
write(2, "\n", 1)                       = 1
write(2, "EINTR : ", 8)                 = 8
write(2, "4", 1)                        = 1
write(2, "\n", 1)                       = 1
write(2, "EINVAL: ", 8)                 = 8
write(2, "22", 2)                       = 2
write(2, "\n", 1)                       = 1
write(2, "ENOTSUP: ", 9)                = 9
write(2, "95", 2)                       = 2
write(2, "\n", 1)                       = 1
write(2, "Testing CLOCK_MONOTONIC ", 24) = 24
write(2, "\n", 1)                       = 1
clock_getres(CLOCK_MONOTONIC, {0, 400}) = 0
write(2, "clock_getres return value: ", 27) = 27
write(2, "0", 1)                        = 1
write(2, " with errno ", 12)            = 12
write(2, "0", 1)                        = 1
write(2, "\n", 1)                       = 1
clock_gettime(CLOCK_MONOTONIC, {64792, 473106000}) = 0
write(2, "clock_gettime return value: ", 28) = 28
write(2, "0", 1)                        = 1
write(2, "\n", 1)                       = 1
clock_nanosleep(CLOCK_MONOTONIC, 0, {0, 100000000}, 0x7fffe836d990) = 0
write(2, "clock_nanosleep return value: ", 30) = 30
write(2, "0", 1)                        = 1
write(2, "\n", 1)                       = 1
write(2, "Testing CLOCK_REALTIME ", 23) = 23
write(2, "\n", 1)                       = 1
clock_getres(CLOCK_REALTIME, {0, 400})  = 0
write(2, "clock_getres return value: ", 27) = 27
write(2, "0", 1)                        = 1
write(2, " with errno ", 12)            = 12
write(2, "0", 1)                        = 1
write(2, "\n", 1)                       = 1
clock_gettime(CLOCK_REALTIME, {1505639919, 799894800}) = 0
write(2, "clock_gettime return value: ", 28) = 28
write(2, "0", 1)                        = 1
write(2, "\n", 1)                       = 1
clock_nanosleep(CLOCK_REALTIME, 0, {0, 100000000}, 0x7fffe836d990) = -1 EINVAL (Invalid argument)
write(2, "clock_nanosleep return value: ", 30) = 30
write(2, "22", 2)                       = 2
write(2, "\n", 1)                       = 1
write(2, "Testing CLOCK_PROCESS_CPUTIME_ID"..., 33) = 33
write(2, "\n", 1)                       = 1
clock_getres(CLOCK_PROCESS_CPUTIME_ID, 0x7fffe836d960) = -1 EINVAL (Invalid argument)
write(2, "clock_getres return value: ", 27) = 27
write(2, "-1", 2)                       = 2
write(2, " with errno ", 12)            = 12
write(2, "22", 2)                       = 2
write(2, "\n", 1)                       = 1
clock_gettime(CLOCK_PROCESS_CPUTIME_ID, {0, 15625000}) = 0
write(2, "clock_gettime return value: ", 28) = 28
write(2, "0", 1)                        = 1
write(2, "\n", 1)                       = 1
clock_nanosleep(0xfffffffa /* CLOCK_??? */, 0, {0, 100000000}, 0x7fffe836d990) = -1 EINVAL (Invalid argument)
write(2, "clock_nanosleep return value: ", 30) = 30
write(2, "22", 2)                       = 2
write(2, "\n", 1)                       = 1
write(2, "Testing CLOCK_THREAD_CPUTIME_ID "..., 33) = 33
write(2, "\n", 1)                       = 1
clock_getres(CLOCK_THREAD_CPUTIME_ID, 0x7fffe836d960) = -1 EINVAL (Invalid argument)
write(2, "clock_getres return value: ", 27) = 27
write(2, "-1", 2)                       = 2
write(2, " with errno ", 12)            = 12
write(2, "22", 2)                       = 2
write(2, "\n", 1)                       = 1
clock_gettime(CLOCK_THREAD_CPUTIME_ID, {0, 15625000}) = 0
write(2, "clock_gettime return value: ", 28) = 28
write(2, "0", 1)                        = 1
write(2, "\n", 1)                       = 1
write(2, "clock_nanosleep return value: ", 30) = 30
write(2, "22", 2)                       = 2
write(2, "\n", 1)                       = 1
exit_group(0)                           = ?
+++ exited with 0 +++

There is a similar issue #2116 and User Voice idea https://wpdev.uservoice.com/forums/266908-command-prompt-console-bash-on-ubuntu-on-windo/suggestions/19349059-support-clock-process-thread-cputime-id-clocks related to fully support the clockid CLOCK_PROCESS_CPUTIME_ID and CLOCK_THREAD_CPUTIME_ID , but I did not find any issue related to the full support of CLOCK_REALTIME, so I opened a new issue for this.

[pmendham]

Problem seen independently and replicated on Windows 10 Pro, Version 1709, OS Build 16299.64

This issue currently means that WSL is not POSIX compliant because CLOCK_REALTIME is mandatory.

[peci1]

ARgh, still the same problem on 1809... Took me quite some time to discover why everyting fails in my code...

[therealkenc]

Moving the new landing zone to #4898.