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std.posix.ftruncate: handle NonResizable properly

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This commit is contained in:
Andrew Kelley 2025-07-25 14:14:40 -07:00
parent 8752d80c84
commit 733b208256
2 changed files with 7 additions and 3 deletions
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5
lib/std/fs/File.zig
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@ -2029,7 +2029,10 @@ pub const Writer = struct {
switch (w.mode) { switch (w.mode) {
.positional, .positional,
.positional_reading, .positional_reading,
=> try w.file.setEndPos(w.pos), => w.file.setEndPos(w.pos) catch |err| switch (err) {
error.NonResizable => return,
else => |e| return e,
},
.streaming, .streaming,
.streaming_reading, .streaming_reading,

5
lib/std/posix.zig
View File

@ -1052,6 +1052,7 @@ pub const TruncateError = error{
FileBusy, FileBusy,
AccessDenied, AccessDenied,
PermissionDenied, PermissionDenied,
NonResizable,
} || UnexpectedError; } || UnexpectedError;
/// Length must be positive when treated as an i64. /// Length must be positive when treated as an i64.
@ -1091,7 +1092,7 @@ pub fn ftruncate(fd: fd_t, length: u64) TruncateError!void {
.PERM => return error.PermissionDenied, .PERM => return error.PermissionDenied,
.TXTBSY => return error.FileBusy, .TXTBSY => return error.FileBusy,
.BADF => unreachable, // Handle not open for writing .BADF => unreachable, // Handle not open for writing
.INVAL => unreachable, // Handle not open for writing, negative length, or non-resizable handle .INVAL => return error.NonResizable,
.NOTCAPABLE => return error.AccessDenied, .NOTCAPABLE => return error.AccessDenied,
else => |err| return unexpectedErrno(err), else => |err| return unexpectedErrno(err),
} }
@ -1107,7 +1108,7 @@ pub fn ftruncate(fd: fd_t, length: u64) TruncateError!void {
.PERM => return error.PermissionDenied, .PERM => return error.PermissionDenied,
.TXTBSY => return error.FileBusy, .TXTBSY => return error.FileBusy,
.BADF => unreachable, // Handle not open for writing .BADF => unreachable, // Handle not open for writing
.INVAL => unreachable, // Handle not open for writing, negative length, or non-resizable handle .INVAL => return error.NonResizable, // This is returned for /dev/null for example.
else => |err| return unexpectedErrno(err), else => |err| return unexpectedErrno(err),
} }
} }