Add a "fork" of musl as //fusl.

fusl/include/sys/prctl.h

+#ifndef _SYS_PRCTL_H
+#define _SYS_PRCTL_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+
+#define PR_SET_PDEATHSIG  1
+#define PR_GET_PDEATHSIG  2
+#define PR_GET_DUMPABLE   3
+#define PR_SET_DUMPABLE   4
+#define PR_GET_UNALIGN   5
+#define PR_SET_UNALIGN   6
+#define PR_UNALIGN_NOPRINT 1
+#define PR_UNALIGN_SIGBUS 2
+#define PR_GET_KEEPCAPS   7
+#define PR_SET_KEEPCAPS   8
+#define PR_GET_FPEMU  9
+#define PR_SET_FPEMU 10
+#define PR_FPEMU_NOPRINT 1
+#define PR_FPEMU_SIGFPE 2
+#define PR_GET_FPEXC 11
+#define PR_SET_FPEXC 12
+#define PR_FP_EXC_SW_ENABLE 0x80
+#define PR_FP_EXC_DIV  0x010000
+#define PR_FP_EXC_OVF  0x020000
+#define PR_FP_EXC_UND  0x040000
+#define PR_FP_EXC_RES  0x080000
+#define PR_FP_EXC_INV  0x100000
+#define PR_FP_EXC_DISABLED 0
+#define PR_FP_EXC_NONRECOV 1
+#define PR_FP_EXC_ASYNC 2
+#define PR_FP_EXC_PRECISE 3
+#define PR_GET_TIMING   13
+#define PR_SET_TIMING   14
+#define PR_TIMING_STATISTICAL  0
+#define PR_TIMING_TIMESTAMP    1
+#define PR_SET_NAME    15
+#define PR_GET_NAME    16
+#define PR_GET_ENDIAN 19
+#define PR_SET_ENDIAN 20
+#define PR_ENDIAN_BIG 0
+#define PR_ENDIAN_LITTLE 1
+#define PR_ENDIAN_PPC_LITTLE 2
+#define PR_GET_SECCOMP 21
+#define PR_SET_SECCOMP 22
+#define PR_CAPBSET_READ 23
+#define PR_CAPBSET_DROP 24
+#define PR_GET_TSC 25
+#define PR_SET_TSC 26
+#define PR_TSC_ENABLE 1
+#define PR_TSC_SIGSEGV 2
+#define PR_GET_SECUREBITS 27
+#define PR_SET_SECUREBITS 28
+#define PR_SET_TIMERSLACK 29
+#define PR_GET_TIMERSLACK 30
+
+#define PR_TASK_PERF_EVENTS_DISABLE             31
+#define PR_TASK_PERF_EVENTS_ENABLE              32
+
+#define PR_MCE_KILL     33
+#define PR_MCE_KILL_CLEAR   0
+#define PR_MCE_KILL_SET     1
+#define PR_MCE_KILL_LATE    0
+#define PR_MCE_KILL_EARLY   1
+#define PR_MCE_KILL_DEFAULT 2
+#define PR_MCE_KILL_GET 34
+
+#define PR_SET_MM               35
+#define PR_SET_MM_START_CODE           1
+#define PR_SET_MM_END_CODE             2
+#define PR_SET_MM_START_DATA           3
+#define PR_SET_MM_END_DATA             4
+#define PR_SET_MM_START_STACK          5
+#define PR_SET_MM_START_BRK            6
+#define PR_SET_MM_BRK                  7
+#define PR_SET_MM_ARG_START            8
+#define PR_SET_MM_ARG_END              9
+#define PR_SET_MM_ENV_START            10
+#define PR_SET_MM_ENV_END              11
+#define PR_SET_MM_AUXV                 12
+#define PR_SET_MM_EXE_FILE             13
+#define PR_SET_MM_MAP                  14
+#define PR_SET_MM_MAP_SIZE             15
+
+struct prctl_mm_map {
+        uint64_t start_code;
+        uint64_t end_code;
+        uint64_t start_data;
+        uint64_t end_data;
+        uint64_t start_brk;
+        uint64_t brk;
+        uint64_t start_stack;
+        uint64_t arg_start;
+        uint64_t arg_end;
+        uint64_t env_start;
+        uint64_t env_end;
+        uint64_t *auxv;
+        uint32_t auxv_size;
+        uint32_t exe_fd;
+};
+
+#define PR_SET_PTRACER 0x59616d61
+#define PR_SET_PTRACER_ANY (-1UL)
+
+#define PR_SET_CHILD_SUBREAPER  36
+#define PR_GET_CHILD_SUBREAPER  37
+
+#define PR_SET_NO_NEW_PRIVS     38
+#define PR_GET_NO_NEW_PRIVS     39
+
+#define PR_GET_TID_ADDRESS      40
+
+#define PR_SET_THP_DISABLE      41
+#define PR_GET_THP_DISABLE      42
+
+#define PR_MPX_ENABLE_MANAGEMENT  43
+#define PR_MPX_DISABLE_MANAGEMENT 44
+
+#define PR_SET_FP_MODE          45
+#define PR_GET_FP_MODE          46
+#define PR_FP_MODE_FR (1 << 0)
+#define PR_FP_MODE_FRE (1 << 1)
+
+int prctl (int, ...);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif