diff --git a/src/header/unistd/sysconf.rs b/src/header/unistd/sysconf.rs
index dd61586ff5..0db38b0bbe 100644
--- a/src/header/unistd/sysconf.rs
+++ b/src/header/unistd/sysconf.rs
@@ -8,6 +8,9 @@ mod sys;
 #[path = "sysconf/linux.rs"]
 mod sys;
 
+pub mod constants;
+
+pub use constants::*;
 pub use sys::*;
 
 use core::ffi::{c_int, c_long};
diff --git a/src/header/unistd/sysconf/constants.rs b/src/header/unistd/sysconf/constants.rs
new file mode 100644
index 0000000000..4e8d124ddb
--- /dev/null
+++ b/src/header/unistd/sysconf/constants.rs
@@ -0,0 +1,48 @@
+// This file holds the sysconf constants with the same values
+// across both linux and redox.
+// TODO: add more as redox starts to support them.
+
+use crate::platform::types::c_int;
+
+// POSIX.1 {
+pub const _SC_ARG_MAX: c_int = 0;
+pub const _SC_CHILD_MAX: c_int = 1;
+pub const _SC_CLK_TCK: c_int = 2;
+pub const _SC_NGROUPS_MAX: c_int = 3;
+pub const _SC_OPEN_MAX: c_int = 4;
+pub const _SC_STREAM_MAX: c_int = 5;
+pub const _SC_TZNAME_MAX: c_int = 6;
+// ...
+pub const _SC_TIMERS: c_int = 11;
+// ...
+pub const _SC_SEMAPHORES: c_int = 21;
+pub const _SC_SHARED_MEMORY_OBJECTS: c_int = 22;
+// ...
+pub const _SC_VERSION: c_int = 29;
+pub const _SC_PAGESIZE: c_int = 30;
+pub const _SC_PAGE_SIZE: c_int = 30;
+// ...
+pub const _SC_RE_DUP_MAX: c_int = 44;
+// ...
+pub const _SC_THREADS: c_int = 67;
+pub const _SC_GETGR_R_SIZE_MAX: c_int = 69;
+pub const _SC_GETPW_R_SIZE_MAX: c_int = 70;
+pub const _SC_LOGIN_NAME_MAX: c_int = 71;
+pub const _SC_TTY_NAME_MAX: c_int = 72;
+// ...
+pub const _SC_THREAD_ATTR_STACKADDR: c_int = 77;
+pub const _SC_THREAD_ATTR_STACKSIZE: c_int = 78;
+// ...
+pub const _SC_BARRIERS: c_int = 133;
+// ...
+pub const _SC_MONOTONIC_CLOCK: c_int = 149;
+// ...
+pub const _SC_SHELL: c_int = 157;
+// ...
+pub const _SC_TIMEOUTS: c_int = 164;
+// ...
+pub const _SC_SYMLOOP_MAX: c_int = 173;
+// ...
+pub const _SC_HOST_NAME_MAX: c_int = 180;
+// ...
+// } POSIX.1
diff --git a/src/header/unistd/sysconf/linux.rs b/src/header/unistd/sysconf/linux.rs
index 16426c0f6c..3e0d85ba31 100644
--- a/src/header/unistd/sysconf/linux.rs
+++ b/src/header/unistd/sysconf/linux.rs
@@ -6,7 +6,7 @@ use core::{
 };
 
 use crate::{
-    header::{errno, limits::*, signal},
+    header::{errno, limits::*, signal, unistd::sysconf::constants::*},
     platform,
 };
 
@@ -14,18 +14,10 @@ pub const _XOPEN_IOV_MAX: c_long = 16;
 pub const _XOPEN_NAME_MAX: c_long = 255;
 pub const _XOPEN_PATH_MAX: c_long = 1024;
 
-pub const _SC_ARG_MAX: c_int = 0;
-pub const _SC_CHILD_MAX: c_int = 1;
-pub const _SC_CLK_TCK: c_int = 2;
-pub const _SC_NGROUPS_MAX: c_int = 3;
-pub const _SC_OPEN_MAX: c_int = 4;
-pub const _SC_STREAM_MAX: c_int = 5;
-pub const _SC_TZNAME_MAX: c_int = 6;
 pub const _SC_JOB_CONTROL: c_int = 7;
 pub const _SC_SAVED_IDS: c_int = 8;
-pub const _SC_REALTIME_SIGNALS: c_int = 9;
+pub const _SC_REALTIME_SIGNALS: c_int = 9; // 191 on redox
 pub const _SC_PRIORITY_SCHEDULING: c_int = 10;
-pub const _SC_TIMERS: c_int = 11;
 pub const _SC_ASYNCHRONOUS_IO: c_int = 12;
 pub const _SC_PRIORITIZED_IO: c_int = 13;
 pub const _SC_SYNCHRONIZED_IO: c_int = 14;
@@ -35,21 +27,16 @@ pub const _SC_MEMLOCK: c_int = 17;
 pub const _SC_MEMLOCK_RANGE: c_int = 18;
 pub const _SC_MEMORY_PROTECTION: c_int = 19;
 pub const _SC_MESSAGE_PASSING: c_int = 20;
-pub const _SC_SEMAPHORES: c_int = 21;
-pub const _SC_SHARED_MEMORY_OBJECTS: c_int = 22;
 pub const _SC_AIO_LISTIO_MAX: c_int = 23;
 pub const _SC_AIO_MAX: c_int = 24;
 pub const _SC_AIO_PRIO_DELTA_MAX: c_int = 25;
 pub const _SC_DELAYTIMER_MAX: c_int = 26;
 pub const _SC_MQ_OPEN_MAX: c_int = 27;
 pub const _SC_MQ_PRIO_MAX: c_int = 28;
-pub const _SC_VERSION: c_int = 29;
-pub const _SC_PAGE_SIZE: c_int = 30;
-pub const _SC_PAGESIZE: c_int = 30;
 pub const _SC_RTSIG_MAX: c_int = 31;
 pub const _SC_SEM_NSEMS_MAX: c_int = 32;
 pub const _SC_SEM_VALUE_MAX: c_int = 33;
-pub const _SC_SIGQUEUE_MAX: c_int = 34;
+pub const _SC_SIGQUEUE_MAX: c_int = 34; // 190 on redox
 pub const _SC_TIMER_MAX: c_int = 35;
 pub const _SC_BC_BASE_MAX: c_int = 36;
 pub const _SC_BC_DIM_MAX: c_int = 37;
@@ -58,7 +45,6 @@ pub const _SC_BC_STRING_MAX: c_int = 39;
 pub const _SC_COLL_WEIGHTS_MAX: c_int = 40;
 pub const _SC_EXPR_NEST_MAX: c_int = 42;
 pub const _SC_LINE_MAX: c_int = 43;
-pub const _SC_RE_DUP_MAX: c_int = 44;
 pub const _SC_2_VERSION: c_int = 46;
 pub const _SC_2_C_BIND: c_int = 47;
 pub const _SC_2_C_DEV: c_int = 48;
@@ -68,26 +54,19 @@ pub const _SC_2_SW_DEV: c_int = 51;
 pub const _SC_2_LOCALEDEF: c_int = 52;
 pub const _SC_UIO_MAXIOV: c_int = 60;
 pub const _SC_IOV_MAX: c_int = 60;
-pub const _SC_THREADS: c_int = 67;
 pub const _SC_THREAD_SAFE_FUNCTIONS: c_int = 68;
-pub const _SC_GETGR_R_SIZE_MAX: c_int = 69;
-pub const _SC_GETPW_R_SIZE_MAX: c_int = 70;
-pub const _SC_LOGIN_NAME_MAX: c_int = 71;
-pub const _SC_TTY_NAME_MAX: c_int = 72;
 pub const _SC_THREAD_DESTRUCTOR_ITERATIONS: c_int = 73;
 pub const _SC_THREAD_KEYS_MAX: c_int = 74;
 pub const _SC_THREAD_STACK_MIN: c_int = 75;
 pub const _SC_THREAD_THREADS_MAX: c_int = 76;
-pub const _SC_THREAD_ATTR_STACKADDR: c_int = 77;
-pub const _SC_THREAD_ATTR_STACKSIZE: c_int = 78;
 pub const _SC_THREAD_PRIORITY_SCHEDULING: c_int = 79;
 pub const _SC_THREAD_PRIO_INHERIT: c_int = 80;
 pub const _SC_THREAD_PRIO_PROTECT: c_int = 81;
 pub const _SC_THREAD_PROCESS_SHARED: c_int = 82;
-pub const _SC_NPROCESSORS_CONF: c_int = 83;
-pub const _SC_NPROCESSORS_ONLN: c_int = 84;
-pub const _SC_PHYS_PAGES: c_int = 85;
-pub const _SC_AVPHYS_PAGES: c_int = 86;
+pub const _SC_NPROCESSORS_CONF: c_int = 83; // 57 on redox
+pub const _SC_NPROCESSORS_ONLN: c_int = 84; // 58 on redox
+pub const _SC_PHYS_PAGES: c_int = 85; // 59 on redox
+pub const _SC_AVPHYS_PAGES: c_int = 86; // 60 on redox
 pub const _SC_ATEXIT_MAX: c_int = 87;
 pub const _SC_PASS_MAX: c_int = 88;
 pub const _SC_XOPEN_VERSION: c_int = 89;
@@ -110,33 +89,27 @@ pub const _SC_XOPEN_LEGACY: c_int = 129;
 pub const _SC_XOPEN_REALTIME: c_int = 130;
 pub const _SC_XOPEN_REALTIME_THREADS: c_int = 131;
 pub const _SC_ADVISORY_INFO: c_int = 132;
-pub const _SC_BARRIERS: c_int = 133;
 pub const _SC_CLOCK_SELECTION: c_int = 137;
 pub const _SC_CPUTIME: c_int = 138;
 pub const _SC_THREAD_CPUTIME: c_int = 139;
-pub const _SC_MONOTONIC_CLOCK: c_int = 149;
 pub const _SC_READER_WRITER_LOCKS: c_int = 153;
 pub const _SC_SPIN_LOCKS: c_int = 154;
 pub const _SC_REGEXP: c_int = 155;
-pub const _SC_SHELL: c_int = 157;
 pub const _SC_SPAWN: c_int = 159;
 pub const _SC_SPORADIC_SERVER: c_int = 160;
 pub const _SC_THREAD_SPORADIC_SERVER: c_int = 161;
-pub const _SC_TIMEOUTS: c_int = 164;
 pub const _SC_TYPED_MEMORY_OBJECTS: c_int = 165;
 pub const _SC_2_PBS: c_int = 168;
 pub const _SC_2_PBS_ACCOUNTING: c_int = 169;
 pub const _SC_2_PBS_LOCATE: c_int = 170;
 pub const _SC_2_PBS_MESSAGE: c_int = 171;
 pub const _SC_2_PBS_TRACK: c_int = 172;
-pub const _SC_SYMLOOP_MAX: c_int = 173;
 pub const _SC_STREAMS: c_int = 174;
 pub const _SC_2_PBS_CHECKPOINT: c_int = 175;
 pub const _SC_V6_ILP32_OFF32: c_int = 176;
 pub const _SC_V6_ILP32_OFFBIG: c_int = 177;
 pub const _SC_V6_LP64_OFF64: c_int = 178;
 pub const _SC_V6_LPBIG_OFFBIG: c_int = 179;
-pub const _SC_HOST_NAME_MAX: c_int = 180;
 pub const _SC_TRACE: c_int = 181;
 pub const _SC_TRACE_EVENT_FILTER: c_int = 182;
 pub const _SC_TRACE_INHERIT: c_int = 183;
diff --git a/src/header/unistd/sysconf/redox.rs b/src/header/unistd/sysconf/redox.rs
index 9396db1326..1d2b457e4f 100644
--- a/src/header/unistd/sysconf/redox.rs
+++ b/src/header/unistd/sysconf/redox.rs
@@ -3,7 +3,7 @@ use core::convert::TryInto;
 use crate::{
     error::Errno,
     fs::File,
-    header::{errno, fcntl, limits, sys_statvfs},
+    header::{errno, fcntl, limits, sys_statvfs, unistd::sysconf::constants::*},
     io::Read,
     out::Out,
     platform::{
@@ -12,56 +12,13 @@ use crate::{
     },
 };
 
-// POSIX.1 {
-pub const _SC_ARG_MAX: c_int = 0;
-pub const _SC_CHILD_MAX: c_int = 1;
-pub const _SC_CLK_TCK: c_int = 2;
-pub const _SC_NGROUPS_MAX: c_int = 3;
-pub const _SC_OPEN_MAX: c_int = 4;
-pub const _SC_STREAM_MAX: c_int = 5;
-pub const _SC_TZNAME_MAX: c_int = 6;
-// ...
-pub const _SC_TIMERS: c_int = 11;
-// ...
-pub const _SC_SHARED_MEMORY_OBJECTS: c_int = 22;
-// ...
-pub const _SC_VERSION: c_int = 29;
-pub const _SC_PAGESIZE: c_int = 30;
-pub const _SC_PAGE_SIZE: c_int = 30;
-// ...
-pub const _SC_RE_DUP_MAX: c_int = 44;
-
+// TODO why are these numbered differently to linux?
 pub const _SC_NPROCESSORS_CONF: c_int = 57;
 pub const _SC_NPROCESSORS_ONLN: c_int = 58;
 pub const _SC_PHYS_PAGES: c_int = 59;
 pub const _SC_AVPHYS_PAGES: c_int = 60;
-
-// ...
-pub const _SC_THREADS: c_int = 67;
-pub const _SC_GETGR_R_SIZE_MAX: c_int = 69;
-pub const _SC_GETPW_R_SIZE_MAX: c_int = 70;
-pub const _SC_LOGIN_NAME_MAX: c_int = 71;
-pub const _SC_TTY_NAME_MAX: c_int = 72;
-// ...
-pub const _SC_THREAD_ATTR_STACKADDR: c_int = 77;
-pub const _SC_THREAD_ATTR_STACKSIZE: c_int = 78;
-// ...
-pub const _SC_MONOTONIC_CLOCK: c_int = 149;
-pub const _SC_SEMAPHORES: c_int = 21;
-// ...
-pub const _SC_BARRIERS: c_int = 133;
-// ...
-pub const _SC_SHELL: c_int = 157;
-// ...
-pub const _SC_TIMEOUTS: c_int = 164;
-// ...
-pub const _SC_SYMLOOP_MAX: c_int = 173;
-// ...
-pub const _SC_HOST_NAME_MAX: c_int = 180;
-// ...
 pub const _SC_SIGQUEUE_MAX: c_int = 190;
 pub const _SC_REALTIME_SIGNALS: c_int = 191;
-// } POSIX.1
 
 pub(super) fn sysconf_impl(name: c_int) -> c_long {
     //TODO: Real values