# fcntl Function

Performs the operation specified by command on the file descriptor filedes.

Attention: This interface function is implemented only by MPLAB XC32 C compilers.

Include

<fcntl.h>

Prototype

int fcntl(int filedes, int command, …)

Arguments

 filedes file descriptor on which the command is performed command command performed on file descriptor. Some commands require additional arguments to be supplied ... the data associated with the command to be executed

Return Value

The return value and error conditions are dependent on the individual commands.

Remarks

This function is implemented as a stub that must be completed to suite the application.

The following table shows the available commands.

 F_DUPFD Duplicate the file descriptor (return another file descriptor pointing to the same open file). F_GETFD Get flags associated with the file descriptor. F_SETFD Set flags associated with the file descriptor. F_GETFL Get flags associated with the open file. F_SETFL Set flags associated with the open file. F_GETLK Test a file lock. F_SETLK Set or clear a file lock. F_SETLKW Like F_SETLK, but wait for completion. F_OFD_GETLK Test an open file description lock. F_OFD_SETLK Set or clear an open file description lock F_OFD_SETLKW Like F_OFD_SETLK, but block until lock is acquired. F_GETOWN Get process or process group ID to receive SIGIO signals. F_SETOWN Set process or process group ID to receive SIGIO signals.

Source File

fcntl.c