d6856859d3
* standard library knows if it is linking against libc and will sometimes call libc functions in that case instead of providing redundant definitions * fix infinite loop bug when resolving use declarations * allow calling the same C function from different C imports. closes #277 * push more logic from compiler to std/bootstrap.zig * standard library provides way to access errno closes #274 * fix compile error in standard library for windows * add implementation of getRandomBytes for windows
75 lines
2.6 KiB
Zig
75 lines
2.6 KiB
Zig
const posix = switch(@compileVar("os")) {
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Os.linux => @import("linux.zig"),
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Os.darwin, Os.macosx, Os.ios => @import("darwin.zig"),
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else => @compileError("Unsupported OS"),
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};
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const windows = @import("windows.zig");
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const errno = @import("errno.zig");
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const linking_libc = @import("build.zig").linking_libc;
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const c = @import("c/index.zig");
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error Unexpected;
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/// Fills `buf` with random bytes. If linking against libc, this calls the
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/// appropriate OS-specific library call. Otherwise it uses the zig standard
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/// library implementation.
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pub fn getRandomBytes(buf: []u8) -> %void {
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while (true) {
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const err = switch (@compileVar("os")) {
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Os.linux => {
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if (linking_libc) {
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if (c.getrandom(buf.ptr, buf.len, 0) == -1) *c._errno() else 0
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} else {
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posix.getErrno(posix.getrandom(buf.ptr, buf.len, 0))
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}
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},
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Os.darwin, Os.macosx, Os.ios => {
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if (linking_libc) {
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if (posix.getrandom(buf.ptr, buf.len) == -1) *c._errno() else 0
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} else {
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posix.getErrno(posix.getrandom(buf.ptr, buf.len))
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}
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},
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Os.windows => {
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var hCryptProv: windows.HCRYPTPROV = undefined;
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if (!windows.CryptAcquireContext(&hCryptProv, null, null, windows.PROV_RSA_FULL, 0)) {
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return error.Unexpected;
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}
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defer _ = windows.CryptReleaseContext(hCryptProv, 0);
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if (!windows.CryptGenRandom(hCryptProv, windows.DWORD(buf.len), buf.ptr)) {
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return error.Unexpected;
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}
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return;
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},
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else => @compileError("Unsupported OS"),
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};
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if (err > 0) {
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return switch (err) {
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errno.EINVAL => @unreachable(),
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errno.EFAULT => @unreachable(),
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errno.EINTR => continue,
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else => error.Unexpected,
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}
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}
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return;
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}
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}
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/// Raises a signal in the current kernel thread, ending its execution.
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/// If linking against libc, this calls the abort() libc function. Otherwise
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/// it uses the zig standard library implementation.
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pub coldcc fn abort() -> unreachable {
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if (linking_libc) {
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c.abort();
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}
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switch (@compileVar("os")) {
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Os.linux => {
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_ = posix.raise(posix.SIGABRT);
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_ = posix.raise(posix.SIGKILL);
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while (true) {}
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},
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else => @compileError("Unsupported OS"),
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}
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}
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