Default handler for _IO_UTIME messages
#include <sys/iofunc.h> int iofunc_utime_default( resmgr_context_t* ctp, io_utime_t* msg, iofunc_ocb_t* ocb );
- A pointer to a resmgr_context_t structure that the resource-manager library uses to pass context information between functions.
- A pointer to the io_utime_t structure that contains the message that the resource manager received; see iofunc_utime().
- A pointer to the iofunc_ocb_t structure for the Open Control Block that was created when the client opened the resource.
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The iofunc_utime_default() function implements POSIX semantics for the client's utime() call, which is received as an _IO_UTIME message by the resource manager.
You can place this function directly into the io_funcs table passed to resmgr_attach(), at the utime position, or you can call iofunc_func_init() to initialize all of the functions to their default values.
The iofunc_utime_default() function calls iofunc_utime() to do the actual work. It verifies that the client has the necessary permissions to effect a utime on the device. If so, the utime is performed, modifying elements of the ocb->attr structure. This function takes care of updating these bits in the flags member of ocb->attr:
The iofunc_utime() function then calls iofunc_time_update() to update the appropriate time fields in ocb->attr.
- Successful completion.
- An attempt was made to utime a read-only filesystem.
- The client doesn't have permissions to do the operation.
- The group ID or owner ID didn't match.
Writing a Resource Manager chapter of the Programmer's Guide.