FLOCKFILE(3S)                        BSD                         FLOCKFILE(3S)



NAME
     flockfile - lock a stdio stream

SYNOPSIS
     #include <stdio.h>

     void flockfile (FILE * stream );

DESCRIPTION
     The flockfile function locks a stdio stream so that a thread can have
     exclusive use of that stream for multiple I/O operations.  Use the
     flockfile function for a thread that wishes to ensure that the output of
     several putc(3S) functions, for example, is not garbled by another thread
     also trying to use putc(3S).

     Matching flockfile and funlockfile calls can be nested.

     The behavior of the flockfile function is unspecified if the stream
     argument does not point to a valid FILE structure.

SEE ALSO
     funlockfile(3S), unlocked_getc(3S), unlocked_putc(3S)