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std/c: allow overriding c imports for custom OS #20241

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std/c: allow overriding c imports for custom OS #20241

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17 changes: 13 additions & 4 deletions lib/std/c.zig
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
const std = @import("std");
const root = @import("root");
const builtin = @import("builtin");
const c = @This();
const page_size = std.mem.page_size;
Expand Down Expand Up @@ -32,7 +33,9 @@ pub inline fn versionCheck(comptime glibc_version: std.SemanticVersion) bool {
};
}

pub usingnamespace switch (native_os) {
pub usingnamespace if (@hasDecl(root, "os") and @hasDecl(root.os, "c") and @hasDecl(root.os.c, "os"))
root.os.c.os
else switch (native_os) {
.linux => @import("c/linux.zig"),
.windows => @import("c/windows.zig"),
.macos, .ios, .tvos, .watchos, .visionos => @import("c/darwin.zig"),
Expand All @@ -47,7 +50,9 @@ pub usingnamespace switch (native_os) {
else => struct {},
};

pub const pthread_mutex_t = switch (native_os) {
pub const pthread_mutex_t = if (@hasDecl(root, "os") and @hasDecl(root.os, "c") and @hasDecl(root.os.c, "pthread_mutex_t"))
root.os.c.pthread_mutex_t
else switch (native_os) {
.linux, .minix => extern struct {
data: [data_len]u8 align(@alignOf(usize)) = [_]u8{0} ** data_len,

Expand Down Expand Up @@ -208,7 +213,9 @@ pub const pthread_rwlock_t = switch (native_os) {
else => @compileError("target libc does not have pthread_rwlock_t"),
};

pub const AT = switch (native_os) {
pub const AT = if (@hasDecl(root, "os") and @hasDecl(root.os, "c") and @hasDecl(root.os.c, "AT"))
root.os.c.AT
else switch (native_os) {
.linux => linux.AT,
.windows => struct {
/// Remove directory instead of unlinking file
Expand Down Expand Up @@ -326,7 +333,9 @@ pub const AT = switch (native_os) {
else => @compileError("target libc does not have AT"),
};

pub const O = switch (native_os) {
pub const O = if (@hasDecl(root, "os") and @hasDecl(root.os, "c") and @hasDecl(root.os.c, "O"))
root.os.c.O
else switch (native_os) {
.linux => linux.O,
.emscripten => packed struct(u32) {
ACCMODE: std.posix.ACCMODE = .RDONLY,
Expand Down