Modify the flags associated with a connection
Synopsis:
#include <sys/neutrino.h>
int ConnectFlags( pid_t pid,
int coid,
unsigned mask,
unsigned bits );
int ConnectFlags_r( pid_t pid,
int coid,
unsigned mask,
unsigned bits );
Arguments:
- pid
- The ID of the process that the connection ID belongs to, or 0 for
the current process.
- coid
- The ID of the connection whose flags you want to modify.
- mask
- A bitmap that indicates which bits are to be modified in the flags.
- bits
- The new value of the flags.
The flags currently defined include:
- _NTO_COF_CLOEXEC — close the connection if the
process calls an exec*() function to start a new process.
Library:
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
Description:
The ConnectFlags() and ConnectFlags_r()
kernel calls modify flags associated with the specified connection.
These kernel calls don't block.
These functions are identical except in the way they indicate errors.
See the Returns section for details.
You need to initialize the bits that correspond to the flag in both the
mask and bits arguments:
- If the bit in the mask is 1, and the bit in the bits
is 1, the function turns the flag on.
- If the bit in the mask is 1, and the bit in the bits
is 0, the function turns the flag off.
- If bit in the mask is 0, the function doesn't change the current value
of the flag.
Note:
In order to change the connection flags on a coid for another process with a different user ID,
your process must have the
PROCMGR_AID_CONNECTION ability enabled.
For more information, see
procmgr_ability().
Returns:
The only difference between these functions is the way they indicate errors:
- ConnectFlags()
- The previous value of the flags associated with the connection.
If an error occurs, the function returns -1 and sets
errno.
- ConnectFlags_r()
- The previous value of the flags associated with the connection.
This function does NOT set errno.
If an error occurs, the negative of a value from the Errors section is returned.
Errors:
- EBADF
- The coid isn't a valid connection ID for the process.
- EPERM
- The calling process doesn't have the required permission; see
procmgr_ability().
- ESRCH
- The process ID is invalid.
Classification:
QNX Neutrino
Safety: |
|
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |