This is the
errno for "No space left on device". Predominantly, the error occurs if trying to
write onto a
full filesystem. To
confound things, the
System V IPC APIs (and, consequently, more new interfaces) treat object spaces like
disks/filesystems, possibly returning this
error, too. This shouldn't be a problem, but like many others, the
short description is
suboptimal: it should really be just "No space left".
The common pitfall of errno codes: they weren't made truly general.