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std.posix: Added error message 'ProcessNotFound' for reading and writing in a Linux process (#21430)

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* Added error message 'ProcessNotFound' for reading and writing in a Linux
process.
This error occurs if the process to be read from or written to no longer exists.
Fixes #19875

* Added error message "ProcessNotFound" for error forwarding.

* Add error messgae for forwarding.

* Added message for forwarding.

* Error set completed.

* Fixed format error.

* Changed comments to doc comments.
This commit is contained in:
Chris Boesch 2024-10-03 03:54:30 +02:00 committed by GitHub
parent 8ee52f99ce
commit e22d79dacb
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GPG Key ID: B5690EEEBB952194
3 changed files with 23 additions and 0 deletions
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1
lib/compiler/fmt.zig
View File

@ -207,6 +207,7 @@ const FmtError = error{
LockViolation,
NetNameDeleted,
InvalidArgument,
ProcessNotFound,
} || fs.File.OpenError;
fn fmtPath(fmt: *Fmt, file_path: []const u8, check_mode: bool, dir: fs.Dir, sub_path: []const u8) FmtError!void {

16
lib/std/posix.zig
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@ -798,6 +798,10 @@ pub const ReadError = error{
/// In WASI, this error occurs when the file descriptor does
/// not hold the required rights to read from it.
AccessDenied,
/// This error occurs in Linux if the process to be read from
/// no longer exists.
ProcessNotFound,
} || UnexpectedError;
/// Returns the number of bytes that were read, which can be less than
@ -854,6 +858,7 @@ pub fn read(fd: fd_t, buf: []u8) ReadError!usize {
.INTR => continue,
.INVAL => unreachable,
.FAULT => unreachable,
.NOENT => return error.ProcessNotFound,
.AGAIN => return error.WouldBlock,
.CANCELED => return error.Canceled,
.BADF => return error.NotOpenForReading, // Can be a race condition.
@ -917,6 +922,7 @@ pub fn readv(fd: fd_t, iov: []const iovec) ReadError!usize {
.INTR => continue,
.INVAL => unreachable,
.FAULT => unreachable,
.NOENT => return error.ProcessNotFound,
.AGAIN => return error.WouldBlock,
.BADF => return error.NotOpenForReading, // can be a race condition
.IO => return error.InputOutput,
@ -996,6 +1002,7 @@ pub fn pread(fd: fd_t, buf: []u8, offset: u64) PReadError!usize {
.INTR => continue,
.INVAL => unreachable,
.FAULT => unreachable,
.NOENT => return error.ProcessNotFound,
.AGAIN => return error.WouldBlock,
.BADF => return error.NotOpenForReading, // Can be a race condition.
.IO => return error.InputOutput,
@ -1133,6 +1140,7 @@ pub fn preadv(fd: fd_t, iov: []const iovec, offset: u64) PReadError!usize {
.INTR => continue,
.INVAL => unreachable,
.FAULT => unreachable,
.NOENT => return error.ProcessNotFound,
.AGAIN => return error.WouldBlock,
.BADF => return error.NotOpenForReading, // can be a race condition
.IO => return error.InputOutput,
@ -1176,6 +1184,10 @@ pub const WriteError = error{
/// Connection reset by peer.
ConnectionResetByPeer,
/// This error occurs in Linux if the process being written to
/// no longer exists.
ProcessNotFound,
} || UnexpectedError;
/// Write to a file descriptor.
@ -1243,6 +1255,7 @@ pub fn write(fd: fd_t, bytes: []const u8) WriteError!usize {
.INTR => continue,
.INVAL => return error.InvalidArgument,
.FAULT => unreachable,
.NOENT => return error.ProcessNotFound,
.AGAIN => return error.WouldBlock,
.BADF => return error.NotOpenForWriting, // can be a race condition.
.DESTADDRREQ => unreachable, // `connect` was never called.
@ -1315,6 +1328,7 @@ pub fn writev(fd: fd_t, iov: []const iovec_const) WriteError!usize {
.INTR => continue,
.INVAL => return error.InvalidArgument,
.FAULT => unreachable,
.NOENT => return error.ProcessNotFound,
.AGAIN => return error.WouldBlock,
.BADF => return error.NotOpenForWriting, // Can be a race condition.
.DESTADDRREQ => unreachable, // `connect` was never called.
@ -1404,6 +1418,7 @@ pub fn pwrite(fd: fd_t, bytes: []const u8, offset: u64) PWriteError!usize {
.INTR => continue,
.INVAL => return error.InvalidArgument,
.FAULT => unreachable,
.NOENT => return error.ProcessNotFound,
.AGAIN => return error.WouldBlock,
.BADF => return error.NotOpenForWriting, // Can be a race condition.
.DESTADDRREQ => unreachable, // `connect` was never called.
@ -1488,6 +1503,7 @@ pub fn pwritev(fd: fd_t, iov: []const iovec_const, offset: u64) PWriteError!usiz
.INTR => continue,
.INVAL => return error.InvalidArgument,
.FAULT => unreachable,
.NOENT => return error.ProcessNotFound,
.AGAIN => return error.WouldBlock,
.BADF => return error.NotOpenForWriting, // Can be a race condition.
.DESTADDRREQ => unreachable, // `connect` was never called.

6
lib/std/zig/system.zig
View File

@ -172,6 +172,7 @@ pub const DetectError = error{
DeviceBusy,
OSVersionDetectionFail,
Unexpected,
ProcessNotFound,
};
/// Given a `Target.Query`, which specifies in detail which parts of the
@ -443,6 +444,7 @@ pub const AbiAndDynamicLinkerFromFileError = error{
Unexpected,
UnexpectedEndOfFile,
NameTooLong,
ProcessNotFound,
};
pub fn abiAndDynamicLinkerFromFile(
@ -831,6 +833,7 @@ fn glibcVerFromRPath(rpath: []const u8) !std.SemanticVersion {
error.UnableToReadElfFile,
error.Unexpected,
error.FileSystem,
error.ProcessNotFound,
=> |e| return e,
};
}
@ -1077,6 +1080,7 @@ fn detectAbiAndDynamicLinker(
const len = preadAtLeast(file, &buffer, 0, min_len) catch |err| switch (err) {
error.UnexpectedEndOfFile,
error.UnableToReadElfFile,
error.ProcessNotFound,
=> return defaultAbiAndDynamicLinker(cpu, os, query),
else => |e| return e,
@ -1120,6 +1124,7 @@ fn detectAbiAndDynamicLinker(
error.SymLinkLoop,
error.ProcessFdQuotaExceeded,
error.SystemFdQuotaExceeded,
error.ProcessNotFound,
=> |e| return e,
error.UnableToReadElfFile,
@ -1176,6 +1181,7 @@ fn preadAtLeast(file: fs.File, buf: []u8, offset: u64, min_read_len: usize) !usi
error.Unexpected => return error.Unexpected,
error.InputOutput => return error.FileSystem,
error.AccessDenied => return error.Unexpected,
error.ProcessNotFound => return error.ProcessNotFound,
};
if (len == 0) return error.UnexpectedEndOfFile;
i += len;