iofunc_utime_default()
Default handler for _IO_UTIME messages
Synopsis:
#include <sys/iofunc.h>
int iofunc_utime_default( resmgr_context_t* ctp,
io_utime_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_utime_t structure that contains the message that the resource manager received; see iofunc_utime().
- 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_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 resmgr_io_funcs_t table passed as the io_funcs argument 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:
- IOFUNC_ATTR_ATIME
- IOFUNC_ATTR_CTIME
- IOFUNC_ATTR_MTIME
- IOFUNC_ATTR_DIRTY_TIME
- IOFUNC_ATTR_DIRTY_MODE
The iofunc_utime() function then calls iofunc_time_update() to update the appropriate time fields in ocb->attr.
Returns:
- EOK
- Successful completion.
- EINVAL
- The number of nanoseconds specified in atime_ns or mtime_ns is invalid.
- EOVERFLOW
- The number of seconds specified in atime_s or mtime_s won't fit into a time_t.
- EPERM
- The client doesn't have permissions to do the operation.
- EROFS
- The filesystem is read-only.
Classification:
| Safety: | |
|---|---|
| Cancellation point | No |
| Signal handler | Yes |
| Thread | Yes |