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freebsd: getFdPath: < 13.1 fallback impl

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Michael Dusan 2023-01-02 19:18:32 -05:00
parent 4cdbde55b4
commit 537624734c
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2 changed files with 49 additions and 13 deletions
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2
lib/std/c/freebsd.zig
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@ -21,6 +21,8 @@ pub extern "c" fn malloc_usable_size(?*const anyopaque) usize;
pub extern "c" fn getpid() pid_t;
pub extern "c" fn kinfo_getfile(pid: pid_t, cntp: *c_int) ?[*]kinfo_file;
pub const sf_hdtr = extern struct {
headers: [*]const iovec_const,
hdr_cnt: c_int,

60
lib/std/os.zig
View file

@ -5131,20 +5131,54 @@ pub fn getFdPath(fd: fd_t, out_buffer: *[MAX_PATH_BYTES]u8) RealPathError![]u8 {
return target;
},
.freebsd => {
comptime if (builtin.os.version_range.semver.max.order(.{ .major = 13, .minor = 0 }) == .lt)
@compileError("querying for canonical path of a handle is unsupported on FreeBSD 12 and below");
var kfile: system.kinfo_file = undefined;
kfile.structsize = system.KINFO_FILE_SIZE;
switch (errno(system.fcntl(fd, system.F.KINFO, @ptrToInt(&kfile)))) {
.SUCCESS => {},
.BADF => return error.FileNotFound,
else => |err| return unexpectedErrno(err),
if (comptime builtin.os.version_range.semver.max.order(.{ .major = 13, .minor = 0 }) == .gt) {
var kfile: system.kinfo_file = undefined;
kfile.structsize = system.KINFO_FILE_SIZE;
switch (errno(system.fcntl(fd, system.F.KINFO, @ptrToInt(&kfile)))) {
.SUCCESS => {},
.BADF => return error.FileNotFound,
else => |err| return unexpectedErrno(err),
}
const len = mem.indexOfScalar(u8, &kfile.path, 0) orelse MAX_PATH_BYTES;
mem.copy(u8, out_buffer, kfile.path[0..len]);
return out_buffer[0..len];
} else {
// This fallback implementation reimplements libutil's `kinfo_getfile()`.
// The motivation is to avoid linking -lutil when building zig or general
// user executables.
var mib = [4]c_int{ CTL.KERN, KERN.PROC, KERN.PROC_FILEDESC, system.getpid() };
var len: usize = undefined;
sysctl(&mib, null, &len, null, 0) catch |err| switch (err) {
error.PermissionDenied => unreachable,
error.SystemResources => return error.SystemResources,
error.NameTooLong => unreachable,
error.UnknownName => unreachable,
else => return error.Unexpected,
};
len = len * 4 / 3;
const buf = std.heap.c_allocator.alloc(u8, len) catch return error.SystemResources;
defer std.heap.c_allocator.free(buf);
len = buf.len;
sysctl(&mib, &buf[0], &len, null, 0) catch |err| switch (err) {
error.PermissionDenied => unreachable,
error.SystemResources => return error.SystemResources,
error.NameTooLong => unreachable,
error.UnknownName => unreachable,
else => return error.Unexpected,
};
var i: usize = 0;
while (i < len) {
const kf: *align(1) system.kinfo_file = @ptrCast(*align(1) system.kinfo_file, &buf[i]);
if (kf.fd == fd) {
len = mem.indexOfScalar(u8, &kf.path, 0) orelse MAX_PATH_BYTES;
if (len == 0) return error.NameTooLong;
mem.copy(u8, out_buffer, kf.path[0..len]);
return out_buffer[0..len];
}
i += @intCast(usize, kf.structsize);
}
return error.InvalidHandle;
}
const len = mem.indexOfScalar(u8, &kfile.path, 0) orelse MAX_PATH_BYTES;
mem.copy(u8, out_buffer, kfile.path[0..len]);
return out_buffer[0..len];
},
else => @compileError("querying for canonical path of a handle is unsupported on this host"),
}