Auto merge of #2114 - voidc:syscalls, r=JohnTitor

Add more syscall constansts for Linux

In #1897 (comment), there was interest in adding constants for recently added Linux syscalls. I went ahead and added consts for syscalls up until (the currently unreleased) Linux 5.12. Here is an overview:

| Syscall           | NR  | since |
| ----------------- | --- | ----- |
| pidfd_send_signal | 424 | 5.1   |
| io_uring_setup    | 425 | 5.1   |
| io_uring_enter    | 426 | 5.1   |
| io_uring_register | 427 | 5.1   |
| open_tree         | 428 | 5.2   |
| move_mount        | 429 | 5.2   |
| fsopen            | 430 | 5.2   |
| fsconfig          | 431 | 5.2   |
| fsmount           | 432 | 5.2   |
| fspick            | 433 | 5.2   |
| pidfd_open        | 434 | 5.3   |
| clone3            | 435 | 5.3   |
| close_range       | 436 | 5.9   |
| openat2           | 437 | 5.9   |
| pidfd_getfd       | 438 | 5.9   |
| faccessat2        | 439 | 5.9   |
| process_madvise   | 440 | 5.10  |
| epoll_pwait2      | 441 | 5.11  |
| mount_setattr     | 442 | 5.12  |

([source](https://github.com/torvalds/linux/blob/1e28eed17697bcf343c6743f0028cc3b5dd88bf0/include/uapi/asm-generic/unistd.h#L825-L865))

The constants are added for `-gnu` and `-musl` targets.
I'm unsure to what extend they are actually present in the headers of these libraries.

Support is added for all architectures except hexagon.

Author: bors

libc-test/build.rs

@@ -2654,6 +2654,16 @@ fn test_linux(target: &str) {
             // Not yet implemented on sparc64
             "SYS_clone3" if mips | sparc64 => true,
 
+            // FIXME: these syscalls were added in Linux 5.9 or later
+            // and are currently not included in the glibc headers.
+            | "SYS_close_range"
+            | "SYS_openat2"
+            | "SYS_pidfd_getfd"
+            | "SYS_faccessat2"
+            | "SYS_process_madvise"
+            | "SYS_epoll_pwait2"
+            | "SYS_mount_setattr" => true,
+
             // Requires more recent kernel headers:
             | "IFLA_PROP_LIST"
             | "IFLA_ALT_IFNAME"

src/unix/linux_like/linux/gnu/b32/arm/mod.rs

@@ -870,8 +870,25 @@ pub const SYS_pkey_mprotect: ::c_long = 394;
 pub const SYS_pkey_alloc: ::c_long = 395;
 pub const SYS_pkey_free: ::c_long = 396;
 pub const SYS_statx: ::c_long = 397;
+pub const SYS_pidfd_send_signal: ::c_long = 424;
+pub const SYS_io_uring_setup: ::c_long = 425;
+pub const SYS_io_uring_enter: ::c_long = 426;
+pub const SYS_io_uring_register: ::c_long = 427;
+pub const SYS_open_tree: ::c_long = 428;
+pub const SYS_move_mount: ::c_long = 429;
+pub const SYS_fsopen: ::c_long = 430;
+pub const SYS_fsconfig: ::c_long = 431;
+pub const SYS_fsmount: ::c_long = 432;
+pub const SYS_fspick: ::c_long = 433;
 pub const SYS_pidfd_open: ::c_long = 434;
 pub const SYS_clone3: ::c_long = 435;
+pub const SYS_close_range: ::c_long = 436;
+pub const SYS_openat2: ::c_long = 437;
+pub const SYS_pidfd_getfd: ::c_long = 438;
+pub const SYS_faccessat2: ::c_long = 439;
+pub const SYS_process_madvise: ::c_long = 440;
+pub const SYS_epoll_pwait2: ::c_long = 441;
+pub const SYS_mount_setattr: ::c_long = 442;
 
 cfg_if! {
     if #[cfg(libc_align)] {

src/unix/linux_like/linux/gnu/b32/mips/mod.rs

@@ -527,8 +527,25 @@ pub const SYS_pkey_mprotect: ::c_long = 4000 + 363;
 pub const SYS_pkey_alloc: ::c_long = 4000 + 364;
 pub const SYS_pkey_free: ::c_long = 4000 + 365;
 pub const SYS_statx: ::c_long = 4000 + 366;
+pub const SYS_pidfd_send_signal: ::c_long = 4000 + 424;
+pub const SYS_io_uring_setup: ::c_long = 4000 + 425;
+pub const SYS_io_uring_enter: ::c_long = 4000 + 426;
+pub const SYS_io_uring_register: ::c_long = 4000 + 427;
+pub const SYS_open_tree: ::c_long = 4000 + 428;
+pub const SYS_move_mount: ::c_long = 4000 + 429;
+pub const SYS_fsopen: ::c_long = 4000 + 430;
+pub const SYS_fsconfig: ::c_long = 4000 + 431;
+pub const SYS_fsmount: ::c_long = 4000 + 432;
+pub const SYS_fspick: ::c_long = 4000 + 433;
 pub const SYS_pidfd_open: ::c_long = 4000 + 434;
 pub const SYS_clone3: ::c_long = 4000 + 435;
+pub const SYS_close_range: ::c_long = 4000 + 436;
+pub const SYS_openat2: ::c_long = 4000 + 437;
+pub const SYS_pidfd_getfd: ::c_long = 4000 + 438;
+pub const SYS_faccessat2: ::c_long = 4000 + 439;
+pub const SYS_process_madvise: ::c_long = 4000 + 440;
+pub const SYS_epoll_pwait2: ::c_long = 4000 + 441;
+pub const SYS_mount_setattr: ::c_long = 4000 + 442;
 
 pub const O_DIRECT: ::c_int = 0x8000;
 pub const O_DIRECTORY: ::c_int = 0x10000;

src/unix/linux_like/linux/gnu/b32/powerpc.rs

@@ -874,5 +874,22 @@ pub const SYS_preadv2: ::c_long = 380;
 pub const SYS_pwritev2: ::c_long = 381;
 pub const SYS_kexec_file_load: ::c_long = 382;
 pub const SYS_statx: ::c_long = 383;
+pub const SYS_pidfd_send_signal: ::c_long = 424;
+pub const SYS_io_uring_setup: ::c_long = 425;
+pub const SYS_io_uring_enter: ::c_long = 426;
+pub const SYS_io_uring_register: ::c_long = 427;
+pub const SYS_open_tree: ::c_long = 428;
+pub const SYS_move_mount: ::c_long = 429;
+pub const SYS_fsopen: ::c_long = 430;
+pub const SYS_fsconfig: ::c_long = 431;
+pub const SYS_fsmount: ::c_long = 432;
+pub const SYS_fspick: ::c_long = 433;
 pub const SYS_pidfd_open: ::c_long = 434;
 pub const SYS_clone3: ::c_long = 435;
+pub const SYS_close_range: ::c_long = 436;
+pub const SYS_openat2: ::c_long = 437;
+pub const SYS_pidfd_getfd: ::c_long = 438;
+pub const SYS_faccessat2: ::c_long = 439;
+pub const SYS_process_madvise: ::c_long = 440;
+pub const SYS_epoll_pwait2: ::c_long = 441;
+pub const SYS_mount_setattr: ::c_long = 442;

src/unix/linux_like/linux/gnu/b32/riscv32/mod.rs

@@ -818,3 +818,22 @@ pub const SYS_pkey_mprotect: ::c_long = 288;
 pub const SYS_pkey_alloc: ::c_long = 289;
 pub const SYS_pkey_free: ::c_long = 290;
 pub const SYS_statx: ::c_long = 291;
+pub const SYS_pidfd_send_signal: ::c_long = 424;
+pub const SYS_io_uring_setup: ::c_long = 425;
+pub const SYS_io_uring_enter: ::c_long = 426;
+pub const SYS_io_uring_register: ::c_long = 427;
+pub const SYS_open_tree: ::c_long = 428;
+pub const SYS_move_mount: ::c_long = 429;
+pub const SYS_fsopen: ::c_long = 430;
+pub const SYS_fsconfig: ::c_long = 431;
+pub const SYS_fsmount: ::c_long = 432;
+pub const SYS_fspick: ::c_long = 433;
+pub const SYS_pidfd_open: ::c_long = 434;
+pub const SYS_clone3: ::c_long = 435;
+pub const SYS_close_range: ::c_long = 436;
+pub const SYS_openat2: ::c_long = 437;
+pub const SYS_pidfd_getfd: ::c_long = 438;
+pub const SYS_faccessat2: ::c_long = 439;
+pub const SYS_process_madvise: ::c_long = 440;
+pub const SYS_epoll_pwait2: ::c_long = 441;
+pub const SYS_mount_setattr: ::c_long = 442;

src/unix/linux_like/linux/gnu/b32/sparc/mod.rs

@@ -908,9 +908,26 @@ pub const SYS_copy_file_range: ::c_long = 357;
 pub const SYS_preadv2: ::c_long = 358;
 pub const SYS_pwritev2: ::c_long = 359;
 pub const SYS_statx: ::c_long = 360;
+pub const SYS_pidfd_send_signal: ::c_long = 424;
+pub const SYS_io_uring_setup: ::c_long = 425;
+pub const SYS_io_uring_enter: ::c_long = 426;
+pub const SYS_io_uring_register: ::c_long = 427;
+pub const SYS_open_tree: ::c_long = 428;
+pub const SYS_move_mount: ::c_long = 429;
+pub const SYS_fsopen: ::c_long = 430;
+pub const SYS_fsconfig: ::c_long = 431;
+pub const SYS_fsmount: ::c_long = 432;
+pub const SYS_fspick: ::c_long = 433;
 pub const SYS_pidfd_open: ::c_long = 434;
 // Reserved in the kernel, but not actually implemented yet
 pub const SYS_clone3: ::c_long = 435;
+pub const SYS_close_range: ::c_long = 436;
+pub const SYS_openat2: ::c_long = 437;
+pub const SYS_pidfd_getfd: ::c_long = 438;
+pub const SYS_faccessat2: ::c_long = 439;
+pub const SYS_process_madvise: ::c_long = 440;
+pub const SYS_epoll_pwait2: ::c_long = 441;
+pub const SYS_mount_setattr: ::c_long = 442;
 
 cfg_if! {
     if #[cfg(libc_align)] {

src/unix/linux_like/linux/gnu/b32/x86/mod.rs

@@ -1105,8 +1105,25 @@ pub const SYS_pkey_mprotect: ::c_long = 380;
 pub const SYS_pkey_alloc: ::c_long = 381;
 pub const SYS_pkey_free: ::c_long = 382;
 pub const SYS_statx: ::c_long = 383;
+pub const SYS_pidfd_send_signal: ::c_long = 424;
+pub const SYS_io_uring_setup: ::c_long = 425;
+pub const SYS_io_uring_enter: ::c_long = 426;
+pub const SYS_io_uring_register: ::c_long = 427;
+pub const SYS_open_tree: ::c_long = 428;
+pub const SYS_move_mount: ::c_long = 429;
+pub const SYS_fsopen: ::c_long = 430;
+pub const SYS_fsconfig: ::c_long = 431;
+pub const SYS_fsmount: ::c_long = 432;
+pub const SYS_fspick: ::c_long = 433;
 pub const SYS_pidfd_open: ::c_long = 434;
 pub const SYS_clone3: ::c_long = 435;
+pub const SYS_close_range: ::c_long = 436;
+pub const SYS_openat2: ::c_long = 437;
+pub const SYS_pidfd_getfd: ::c_long = 438;
+pub const SYS_faccessat2: ::c_long = 439;
+pub const SYS_process_madvise: ::c_long = 440;
+pub const SYS_epoll_pwait2: ::c_long = 441;
+pub const SYS_mount_setattr: ::c_long = 442;
 
 // offsets in user_regs_structs, from sys/reg.h
 pub const EBX: ::c_int = 0;

src/unix/linux_like/linux/gnu/b64/aarch64/mod.rs

@@ -976,8 +976,25 @@ pub const SYS_pkey_mprotect: ::c_long = 288;
 pub const SYS_pkey_alloc: ::c_long = 289;
 pub const SYS_pkey_free: ::c_long = 290;
 pub const SYS_statx: ::c_long = 291;
+pub const SYS_pidfd_send_signal: ::c_long = 424;
+pub const SYS_io_uring_setup: ::c_long = 425;
+pub const SYS_io_uring_enter: ::c_long = 426;
+pub const SYS_io_uring_register: ::c_long = 427;
+pub const SYS_open_tree: ::c_long = 428;
+pub const SYS_move_mount: ::c_long = 429;
+pub const SYS_fsopen: ::c_long = 430;
+pub const SYS_fsconfig: ::c_long = 431;
+pub const SYS_fsmount: ::c_long = 432;
+pub const SYS_fspick: ::c_long = 433;
 pub const SYS_pidfd_open: ::c_long = 434;
 pub const SYS_clone3: ::c_long = 435;
+pub const SYS_close_range: ::c_long = 436;
+pub const SYS_openat2: ::c_long = 437;
+pub const SYS_pidfd_getfd: ::c_long = 438;
+pub const SYS_faccessat2: ::c_long = 439;
+pub const SYS_process_madvise: ::c_long = 440;
+pub const SYS_epoll_pwait2: ::c_long = 441;
+pub const SYS_mount_setattr: ::c_long = 442;
 
 extern "C" {
     pub fn sysctl(

src/unix/linux_like/linux/gnu/b64/mips64/mod.rs

@@ -577,8 +577,25 @@ pub const SYS_pkey_mprotect: ::c_long = 5000 + 323;
 pub const SYS_pkey_alloc: ::c_long = 5000 + 324;
 pub const SYS_pkey_free: ::c_long = 5000 + 325;
 pub const SYS_statx: ::c_long = 5000 + 326;
+pub const SYS_pidfd_send_signal: ::c_long = 5000 + 424;
+pub const SYS_io_uring_setup: ::c_long = 5000 + 425;
+pub const SYS_io_uring_enter: ::c_long = 5000 + 426;
+pub const SYS_io_uring_register: ::c_long = 5000 + 427;
+pub const SYS_open_tree: ::c_long = 5000 + 428;
+pub const SYS_move_mount: ::c_long = 5000 + 429;
+pub const SYS_fsopen: ::c_long = 5000 + 430;
+pub const SYS_fsconfig: ::c_long = 5000 + 431;
+pub const SYS_fsmount: ::c_long = 5000 + 432;
+pub const SYS_fspick: ::c_long = 5000 + 433;
 pub const SYS_pidfd_open: ::c_long = 5000 + 434;
 pub const SYS_clone3: ::c_long = 5000 + 435;
+pub const SYS_close_range: ::c_long = 5000 + 436;
+pub const SYS_openat2: ::c_long = 5000 + 437;
+pub const SYS_pidfd_getfd: ::c_long = 5000 + 438;
+pub const SYS_faccessat2: ::c_long = 5000 + 439;
+pub const SYS_process_madvise: ::c_long = 5000 + 440;
+pub const SYS_epoll_pwait2: ::c_long = 5000 + 441;
+pub const SYS_mount_setattr: ::c_long = 5000 + 442;
 
 pub const SFD_CLOEXEC: ::c_int = 0x080000;
 

src/unix/linux_like/linux/gnu/b64/powerpc64/mod.rs

@@ -1043,8 +1043,25 @@ pub const SYS_preadv2: ::c_long = 380;
 pub const SYS_pwritev2: ::c_long = 381;
 pub const SYS_kexec_file_load: ::c_long = 382;
 pub const SYS_statx: ::c_long = 383;
+pub const SYS_pidfd_send_signal: ::c_long = 424;
+pub const SYS_io_uring_setup: ::c_long = 425;
+pub const SYS_io_uring_enter: ::c_long = 426;
+pub const SYS_io_uring_register: ::c_long = 427;
+pub const SYS_open_tree: ::c_long = 428;
+pub const SYS_move_mount: ::c_long = 429;
+pub const SYS_fsopen: ::c_long = 430;
+pub const SYS_fsconfig: ::c_long = 431;
+pub const SYS_fsmount: ::c_long = 432;
+pub const SYS_fspick: ::c_long = 433;
 pub const SYS_pidfd_open: ::c_long = 434;
 pub const SYS_clone3: ::c_long = 435;
+pub const SYS_close_range: ::c_long = 436;
+pub const SYS_openat2: ::c_long = 437;
+pub const SYS_pidfd_getfd: ::c_long = 438;
+pub const SYS_faccessat2: ::c_long = 439;
+pub const SYS_process_madvise: ::c_long = 440;
+pub const SYS_epoll_pwait2: ::c_long = 441;
+pub const SYS_mount_setattr: ::c_long = 442;
 
 extern "C" {
     pub fn sysctl(