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Kernel: Add some spec links and comments to sys$posix_fallocate()

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This commit is contained in:
Andreas Kling 2022-11-27 20:13:15 +01:00
parent 961e1e590b
commit 4277e2d58f
1 changed files with 5 additions and 0 deletions
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5
Kernel/Syscalls/fallocate.cpp
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@ -12,11 +12,13 @@
namespace Kernel { namespace Kernel {
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/posix_fallocate.html
ErrorOr<FlatPtr> Process::sys$posix_fallocate(int fd, Userspace<off_t const*> userspace_offset, Userspace<off_t const*> userspace_length) ErrorOr<FlatPtr> Process::sys$posix_fallocate(int fd, Userspace<off_t const*> userspace_offset, Userspace<off_t const*> userspace_length)
{ {
VERIFY_NO_PROCESS_BIG_LOCK(this); VERIFY_NO_PROCESS_BIG_LOCK(this);
TRY(require_promise(Pledge::stdio)); TRY(require_promise(Pledge::stdio));
// [EINVAL] The len argument is less than zero, or the offset argument is less than zero, or the underlying file system does not support this operation.
auto offset = TRY(copy_typed_from_user(userspace_offset)); auto offset = TRY(copy_typed_from_user(userspace_offset));
if (offset < 0) if (offset < 0)
return EINVAL; return EINVAL;
@ -31,9 +33,12 @@ ErrorOr<FlatPtr> Process::sys$posix_fallocate(int fd, Userspace<off_t const*> us
return EFBIG; return EFBIG;
auto description = TRY(open_file_description(fd)); auto description = TRY(open_file_description(fd));
// [EBADF] The fd argument references a file that was opened without write permission.
if (!description->is_writable()) if (!description->is_writable())
return EBADF; return EBADF;
// [ESPIPE] The fd argument is associated with a pipe or FIFO.
if (description->is_fifo()) if (description->is_fifo())
return ESPIPE; return ESPIPE;