iofunc_mmap_default()

Default handler for _IO_MMAP messages

Synopsis:

#include <sys/iofunc.h>

int iofunc_mmap_default ( resmgr_context_t * ctp,
                          io_mmap_t * msg,
                          iofunc_ocb_t * ocb );

Arguments:

ctp: A pointer to a resmgr_context_t structure that the resource-manager library uses to pass context information between functions.
msg: A pointer to the io_mmap_t structure that contains the message that the resource manager received. For more information, see the documentation for iofunc_mmap().
ocb: A pointer to the iofunc_ocb_t structure for the Open Control Block that was created when the client opened the resource.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The iofunc_mmap_default() function provides functionality for the _IO_MMAP message. This message is private to the Memory Manager (a part of the microkernel's procnto).

You can place this function directly into the resmgr_io_funcs_t table passed as the io_funcs argument to resmgr_attach(), at the mmap position, or you can call iofunc_func_init() to initialize all of the functions to their default values.

The iofunc_mmap_default() function calls iofunc_mmap() to do the actual work.

Note that if you write your own handler for _IO_MMAP messages, and you want the process manager to be able to execute binaries from the resource, then your handler must use the iofunc_mmap() function.

Returns:

A nonpositive value (i.e., less than or equal to 0): Successful completion.
EROFS: An attempt to memory map (mmap) a read-only file, using the PROT_WRITE page protection mode.
EACCES: The client doesn't have the appropriate permissions.
ENOMEM: Insufficient memory exists to allocate internal resources required to effect the mapping.

Classification:

QNX Neutrino

Safety:
Cancellation point	No
Interrupt handler	No
Signal handler	Yes
Thread	Yes