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link: PTRACE_ATTACH/PTRACE_DETACH

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Andrew Kelley 2022-01-14 18:04:11 -07:00
parent ae8e7c8f5a
commit 50a2bb58d2
1 changed files with 13 additions and 1 deletions
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14
src/link.zig
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@ -378,7 +378,7 @@ pub const File = struct {
if (build_options.only_c) unreachable;
if (base.file != null) return;
const emit = base.options.emit orelse return;
if (base.child_pid != null) {
if (base.child_pid) |pid| {
// If we try to open the output file in write mode while it is running,
// it will return ETXTBSY. So instead, we copy the file, atomically rename it
// over top of the exe path, and then proceed normally. This changes the inode,
@ -388,6 +388,11 @@ pub const File = struct {
});
try emit.directory.handle.copyFile(emit.sub_path, emit.directory.handle, tmp_sub_path, .{});
try emit.directory.handle.rename(tmp_sub_path, emit.sub_path);
switch (std.os.errno(std.os.linux.ptrace(std.os.linux.PTRACE.ATTACH, pid, 0, 0, 0))) {
.SUCCESS => {},
else => |errno| log.warn("ptrace failure: {s}", .{@tagName(errno)}),
}
}
base.file = try emit.directory.handle.createFile(emit.sub_path, .{
.truncate = false,
@ -437,6 +442,13 @@ pub const File = struct {
}
f.close();
base.file = null;
if (base.child_pid) |pid| {
switch (std.os.errno(std.os.linux.ptrace(std.os.linux.PTRACE.DETACH, pid, 0, 0, 0))) {
.SUCCESS => {},
else => |errno| log.warn("ptrace failure: {s}", .{@tagName(errno)}),
}
}
},
.c, .spirv, .nvptx => {},
}