| ... | @@ -442,6 +442,7 @@ fn getRandomBytesDevURandom(buf: []u8) !void { | ... | @@ -442,6 +442,7 @@ fn getRandomBytesDevURandom(buf: []u8) !void { |
| 442 | /// Causes abnormal process termination. | 442 | /// Causes abnormal process termination. |
| 443 | /// If linking against libc, this calls the abort() libc function. Otherwise | 443 | /// If linking against libc, this calls the abort() libc function. Otherwise |
| 444 | /// it raises SIGABRT followed by SIGKILL and finally lo | 444 | /// it raises SIGABRT followed by SIGKILL and finally lo |
| | 445 | /// Invokes the current signal handler for SIGABRT, if any. |
| 445 | pub fn abort() noreturn { | 446 | pub fn abort() noreturn { |
| 446 | @setCold(true); | 447 | @setCold(true); |
| 447 | // MSVCRT abort() sometimes opens a popup window which is undesirable, so | 448 | // MSVCRT abort() sometimes opens a popup window which is undesirable, so |
| ... | @@ -454,12 +455,44 @@ pub fn abort() noreturn { | ... | @@ -454,12 +455,44 @@ pub fn abort() noreturn { |
| 454 | windows.kernel32.ExitProcess(3); | 455 | windows.kernel32.ExitProcess(3); |
| 455 | } | 456 | } |
| 456 | if (!builtin.link_libc and builtin.os.tag == .linux) { | 457 | if (!builtin.link_libc and builtin.os.tag == .linux) { |
| | 458 | // The Linux man page says that the libc abort() function |
| | 459 | // "first unblocks the SIGABRT signal", but this is a footgun |
| | 460 | // for user-defined signal handlers that want to restore some state in |
| | 461 | // some program sections and crash in others. |
| | 462 | // So, the user-installed SIGABRT handler is run, if present. |
| 457 | raise(SIG.ABRT) catch {}; | 463 | raise(SIG.ABRT) catch {}; |
| 458 | | 464 | |
| 459 | // TODO the rest of the implementation of abort() from musl libc here | 465 | // Disable all signal handlers. |
| | 466 | sigprocmask(SIG.BLOCK, &linux.all_mask, null); |
| 460 | | 467 | |
| | 468 | // Only one thread may proceed to the rest of abort(). |
| | 469 | if (!builtin.single_threaded) { |
| | 470 | const global = struct { |
| | 471 | var abort_entered: bool = false; |
| | 472 | }; |
| | 473 | while (@cmpxchgWeak(bool, &global.abort_entered, false, true, .SeqCst, .SeqCst)) |_| {} |
| | 474 | } |
| | 475 | |
| | 476 | // Install default handler so that the tkill below will terminate. |
| | 477 | const sigact = Sigaction{ |
| | 478 | .handler = .{ .sigaction = SIG.DFL }, |
| | 479 | .mask = undefined, |
| | 480 | .flags = undefined, |
| | 481 | .restorer = undefined, |
| | 482 | }; |
| | 483 | sigaction(SIG.ABRT, &sigact, null) catch |err| switch (err) { |
| | 484 | error.OperationNotSupported => unreachable, |
| | 485 | }; |
| | 486 | |
| | 487 | _ = linux.tkill(linux.gettid(), SIG.ABRT); |
| | 488 | |
| | 489 | const sigabrtmask: linux.sigset_t = [_]u32{0} ** 31 ++ [_]u32{1 << (SIG.ABRT - 1)}; |
| | 490 | sigprocmask(SIG.UNBLOCK, &sigabrtmask, null); |
| | 491 | |
| | 492 | // Beyond this point should be unreachable. |
| | 493 | @intToPtr(*allowzero volatile u8, 0).* = 0; |
| 461 | raise(SIG.KILL) catch {}; | 494 | raise(SIG.KILL) catch {}; |
| 462 | exit(127); | 495 | exit(127); // Pid 1 might not be signalled in some containers. |
| 463 | } | 496 | } |
| 464 | if (builtin.os.tag == .uefi) { | 497 | if (builtin.os.tag == .uefi) { |
| 465 | exit(0); // TODO choose appropriate exit code | 498 | exit(0); // TODO choose appropriate exit code |
| ... | @@ -485,13 +518,13 @@ pub fn raise(sig: u8) RaiseError!void { | ... | @@ -485,13 +518,13 @@ pub fn raise(sig: u8) RaiseError!void { |
| 485 | if (builtin.os.tag == .linux) { | 518 | if (builtin.os.tag == .linux) { |
| 486 | var set: sigset_t = undefined; | 519 | var set: sigset_t = undefined; |
| 487 | // block application signals | 520 | // block application signals |
| 488 | _ = linux.sigprocmask(SIG.BLOCK, &linux.app_mask, &set); | 521 | sigprocmask(SIG.BLOCK, &linux.app_mask, &set); |
| 489 | | 522 | |
| 490 | const tid = linux.gettid(); | 523 | const tid = linux.gettid(); |
| 491 | const rc = linux.tkill(tid, sig); | 524 | const rc = linux.tkill(tid, sig); |
| 492 | | 525 | |
| 493 | // restore signal mask | 526 | // restore signal mask |
| 494 | _ = linux.sigprocmask(SIG.SETMASK, &set, null); | 527 | sigprocmask(SIG.SETMASK, &set, null); |
| 495 | | 528 | |
| 496 | switch (errno(rc)) { | 529 | switch (errno(rc)) { |
| 497 | .SUCCESS => return, | 530 | .SUCCESS => return, |
| ... | @@ -5441,6 +5474,16 @@ pub fn sigaction(sig: u6, noalias act: ?*const Sigaction, noalias oact: ?*Sigact | ... | @@ -5441,6 +5474,16 @@ pub fn sigaction(sig: u6, noalias act: ?*const Sigaction, noalias oact: ?*Sigact |
| 5441 | } | 5474 | } |
| 5442 | } | 5475 | } |
| 5443 | | 5476 | |
| | 5477 | /// Sets the thread signal mask. |
| | 5478 | pub fn sigprocmask(flags: u32, noalias set: ?*const sigset_t, noalias oldset: ?*sigset_t) void { |
| | 5479 | switch (errno(system.sigprocmask(flags, set, oldset))) { |
| | 5480 | .SUCCESS => return, |
| | 5481 | .FAULT => unreachable, |
| | 5482 | .INVAL => unreachable, |
| | 5483 | else => unreachable, |
| | 5484 | } |
| | 5485 | } |
| | 5486 | |
| 5444 | pub const FutimensError = error{ | 5487 | pub const FutimensError = error{ |
| 5445 | /// times is NULL, or both tv_nsec values are UTIME_NOW, and either: | 5488 | /// times is NULL, or both tv_nsec values are UTIME_NOW, and either: |
| 5446 | /// * the effective user ID of the caller does not match the owner | 5489 | /// * the effective user ID of the caller does not match the owner |
Andrew Kelley <andrew@ziglang.org> 2022-06-06 18:35:24-04:00
GitHub <noreply@github.com> 2022-06-06 18:35:24-04:00
Signed by PGP key 4AEE18F83AFDEB23
lib