DCMD_ALL_SETFLAGS

Updated: October 26, 2022

Set O_* file status flags

Synopsis:

#include <sys/dcmd_all.h>

#define DCMD_ALL_SETFLAGS   __DIOT(_DCMD_ALL, 2, int)

Arguments to devctl():

Argument Value
filedes A file descriptor that you obtained by opening the device.
dcmd DCMD_ALL_SETFLAGS
dev_data_ptr A pointer to a int containing the flags you want to set.
n_bytes sizeof(int)
dev_info_ptr NULL

Description:

This command sets O_* file status flags, described in <fcntl.h>. You can't use this command to set the file access bits. Clients usually use the fcntl() cover function to generate this request:

fcntl(fd, F_SETFL, flags);

Input:

A bitwise OR of zero or more of the following status flags (identified by the QNX Neutrino O_SETFLAG mask):

For more information, see open() in the QNX Neutrino C Library Reference.

Output:

None.

Errors:

The devctl() function can return the following, in addition to the error codes listed in its entry in the C Library Reference:

EINVAL
You specified one of the *SYNC flags, but IOFUNC_PC_SYNC_IO isn't set in the device's mount configuration.

Example:

if (devctl(fd, DCMD_ALL_SETFLAGS, &flags, sizeof flags, NULL) != EOK)
{
   /* Error */
}

See also:

DCMD_ALL_GETFLAGS

devctl(), fcntl(), open() in the QNX Neutrino C Library Reference