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Utilities & Libraries
C Library Reference
I
iofunc_sync_default()
Default handler for _IO_SYNC messages

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        Default handler for _IO_CHOWN messages
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        Free all locks allocated for the client process
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        Default handler for _IO_CLOSE messages
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        Return the memory allocated for an OCB
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        Return the memory allocated for an OCB
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        Handle an _IO_DEVCTL message
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        Default handler for _IO_DEVCTL messages
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        Perform validation that's common to all handlers for _IO_DEVCTL messages
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        Lock a resource
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        Default handler for _IO_LOCK messages
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        Default handler for the lock_ocb callout
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        Handle an _IO_LSEEK message
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        Default handler for _IO_LSEEK messages
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        Verify a client's ability to make a new filesystem entry point
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        Verify a client's ability to open or to create a resource
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        Default handler for _IO_CONNECT messages
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        Increment count and locking flags
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        Default handler for _IO_OPENFD messages
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        Support pathconf() requests
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        Default handler for _IO_PATHCONF messages
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        Default handler for _IO_READ messages
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        Verify a client's read access to a resource
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        Verify the attributes being used to read a link
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        Do permission checks for a _IO_CONNECT_RENAME message
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        Do permission checks for the _IO_SPACE message
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        Populate a stat structure
      - iofunc_stat_default()
        Default handler for _IO_STAT messages
      - iofunc_sync()
        Indicate if synchronization is needed
      - iofunc_sync_default()
        Default handler for _IO_SYNC messages
      - iofunc_sync_verify()
        Verify permissions to sync
      - iofunc_time_update()
        Update time stamps
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        Unblock OCBs
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        Default unblock handler
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        Verify that an entry can be unlinked
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        Default handler for the unlock_ocb callout
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        Update time stamps
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        Default handler for _IO_UTIME messages
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        Default handler for _IO_WRITE messages
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        Verify a client's write access to a resource
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        Arm a resource manager
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        Determine if a number is finite
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        Test a character to see if it's any printable character except a space
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        Determine whether one floating-point number is greater than another
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iofunc_sync_default()

QNX SDP8.0C Library ReferenceAPIDeveloper

Default handler for _IO_SYNC messages

Synopsis:

#include <sys/iofunc.h>

int iofunc_sync_default( resmgr_context_t *ctp,
                         io_sync_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_sync_t structure that contains the message that the resource manager received. For more information, see iofunc_sync_verify().
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_sync_default() function implements POSIX semantics for the client's fsync() call, which is received as an _IO_SYNC 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 sync position, or you can call iofunc_func_init() to initialize all of the functions to their default values.

The iofunc_sync_default() function calls iofunc_sync_verify() to see if the client can synchronize the resource.

Returns:

EINVAL: The resource doesn't support synchronizing.
EOK: The client can synchronize the resource.

Classification:


Safety:
Cancellation point	No
Signal handler	Yes
Thread	Yes

Page updated: August 09, 2024