unistd.h -- Header File

Define constants for file-handling routines
#include <unistd.h>

The header  file unistd.h  defines standard routines  used by the  UNIX and
UNIX-like operating  systems.  It prototypes many  commonly used functions,
and declares manifest constants used when checking file access, setting the
seek pointer, and locking files.

See Also

access(),
fseek(),
header files,
lockf()
POSIX Standard, §2.9

© 2012 by Stephen A. Ness