Update time stamps
Synopsis:
#include <sys/iofunc.h>
int iofunc_utime( resmgr_context_t* ctp,
io_utime_t* msg,
iofunc_ocb_t* ocb,
iofunc_attr_t* attr );
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 below.
- ocb
- A pointer to the
iofunc_ocb_t
structure for the Open Control Block that was created when the
client opened the resource.
- attr
- A pointer to the
iofunc_attr_t
structure that describes the characteristics of the device that's
associated with your resource manager.
Library:
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
Description:
The iofunc_utime() helper function examines the flags
member in the passed attr structure and sets the
IOFUNC_ATTR_ATIME and IOFUNC_ATTR_MTIME bits if requested.
The function sets the IOFUNC_ATTR_CTIME and
IOFUNC_ATTR_DIRTY_TIME bits.
It then calls
iofunc_time_update()
to update the file times.
io_utime_t structure
The io_utime_t structure holds the _IO_UTIME or _IO_UTIME64
message received by the resource manager:
struct _io_utime {
uint16_t type;
uint16_t combine_len;
int32_t cur_flag;
struct __utimbuf32 times;
};
struct _io_utime64 {
uint16_t type;
uint16_t combine_len;
int32_t cur_flag;
int64_t atime_s;
int64_t atime_ns;
int64_t mtime_s;
int64_t mtime_ns;
};
typedef union {
struct _io_utime i;
struct _io_utime i64;
} io_utime_t;
The I/O message structures are unions of an input message (coming to the
resource manager) and an output or reply message (going back to the client).
In this case, there's only an input message, i or i64,
that contains the following members:
- type
- _IO_UTIME or _IO_UTIME64.
- combine_len
- If the message is a combine message, _IO_COMBINE_FLAG
is set in this member.
For more information, see
Combine Messages
chapter of Writing a Resource Manager.
- cur_flag
- If set, iofunc_utime() ignores the times member,
and set the appropriate file times to the current time.
- times
- (_IO_UTIME only)
A __utimbuf32 structure that specifies the time to use when setting the file times.
For more information about this structure, see
utime().
- atime_s, atime_ns, mtime_s,
mtime_ns
- (_IO_UTIME64 only)
The times, in seconds and nanoseconds, to use when setting the file access and modification times.
If the access or modification time is zero, the time is set to the current time.
Returns:
- EOK
- Successful completion.
- EACCES
- The client doesn't have permissions to do the operation.
- 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 group ID or owner ID didn't match.
- EROFS
- The filesystem is read-only.
Classification:
QNX Neutrino
Safety: |
|
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |