AT&T UNIX™PC Unix System V Users Manual - tenox

FCNTL (2) FCNTL (2)
[ENOLCK] Cmd is F _SETLK or F _SETLKW, the type of lock
is a read or write lock, and there are no more record
locks available (too many file segments locked).
[EDEADLK] Cmd is F _SETLKW, the lock is blocked by some
lock from another process, and putting the calling
process to sleep, waiting for that lock to become
free, would cause a deadlock.
[EF AULT] Cmd is F _SETLK, arg points outside the program
address space.
SEE ALSO
close(2), creat(2), dup(2), exec(2), fork(2), open(2), pipe(2), fcntl(S).
DIAGNOSTICS
Upon successful completion, the value returned depends on cmd as
follows:
F _DUPFD A new file descriptor.
F _GETFD Value of flag (only the low-order bit is defined).
F_SETFD Value other than -1.
F _GETFL Value of file flags.
F _SETFL Value other than -1.
F _GETLK Value other than -1.
F _SETLK Value other than -1.
F _SETLKW Value other than -1.
WARNINGS
Because in the future the variable errno will be set to EAGAlN
rather than EACCES when a section of a file is already locked by
another process, portable application programs should expect and
test for either value.
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