NAME

fcntl − file control options

SYNOPSIS

#include <fcntl.h>

DESCRIPTION

The fcntl(2) function provides for control over open files. This include file describes requests and arguments to fcntl and open(2).

/* Flag values accessible to open(2) and fcntl(2) */
/*  (The first three can only be set by open) */
#defineO_RDONLY 0
#defineO_WRONLY 1
#defineO_RDWR 2
#defineO_NDELAY 04 /* Non-blocking I/O */
#defineO_APPEND 010 /* append (writes guaranteed at the end) */
 /* Flag values accessible only to open(2) */
#defineO_CREAT 00400 /* open with file create (uses third open arg)*/
#defineO_TRUNC 01000 /* open with truncation */
#defineO_EXCL 02000 /* exclusive open */
 /* fcntl(2) requests */
#defineF_DUPFD 0 /* Duplicate fildes */
#defineF_GETFD 1 /* Get fildes flags */
#defineF_SETFD 2 /* Set fildes flags */
#defineF_GETFL 3 /* Get file flags */
#defineF_SETFL 4 /* Set file flags */

SEE ALSO

fcntl(2), open(2). 

May 16, 1980