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flockfile(3) Library Functions Manual flockfile(3) NAME flockfile - Locks a stdio stream LIBRARY Standard C Library (libc.a) SYNOPSIS #include <stdio.h> void flockfile( FILE * file ); STANDARDS Interfaces documented on this reference page conform to industry stan- dards as follows: flockfile, POSIX.1c Refer to the standards(5) reference page for more information about in- dustry standards and associated tags. PARAMETERS Specifies the stream to be locked. 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 printf() functions, for example, is not garbled by another thread also trying to use printf(). Matching flockfile() and funlockfile() calls can be nested. The behavior of the flockfile() function is unspecified if the file pa- rameter does not point to a valid FILE structure. RELATED INFORMATION Functions: funlockfile(3), getc_unlocked(3), putc_unlocked(3) delim off flockfile(3)