Getting Started with QNX Neutrino - QNX Software Systems

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Alphabetical listing of connect and I/O functions © 2009, QNX Software Systems GmbH & Co. KG. pathnames; the “original” pathname and the “new” pathname. The original pathname is passed in path, because it’s the thing being worked on (it’s the filename that’s undergoing the name change). The new pathname is the argument to the operation. You’ll see that the extra parameter passed to the connect functions conveniently contains a pointer to the argument of the operation — in this case, the new pathname. (Implementation-wise, the new pathname is stored just past the original pathname in the path pointer, with alignment taken into consideration, but you don’t have to do anything about this — the extra parameter conveniently gives you the correct pointer.) Alphabetical listing of connect and I/O functions This section gives an alphabetical listing of the connect and I/O function entry points that you can fill in (the two tables passed to resmgr_attach()). Remember that if you simply call iofunc_func_init(), all these entries will be filled in with the appropriate defaults; you’d want to modify a particular entry only if you wish to handle that particular message. In the “Examples” section, below, you’ll see some examples of the common functions. It may seem confusing at first, but note that there are in fact two unblock outcalls — one is a connect function and one is an I/O function. This is correct; it’s a reflection of when the unblock occurs. The connect version of the unblock function is used when the kernel unblocks the client immediately after the client has sent the connect message; the I/O version of the unblock function is used when the kernel unblocks the client immediately after the client has sent an I/O message. In order not to confuse the client’s C-library call (for example, open()) with the resource manager connect outcall that goes into that particular slot, we’ve given all of our functions an “io_” prefix. For example, the function description for the open connect outcall slot will be under io_open(). io_chmod() int io_chmod (resmgr_context_t *ctp, io_chmod_t *msg, RESMGR_OCB_T *ocb) Classification: I/O function Default handler: iofunc_chmod_default() Helper functions: iofunc_chmod() Client functions: chmod(), fchmod() Messages: _IO_CHMOD Data structure: struct _io_chmod { uint16_t type; uint16_t combine_len; mode_t mode; }; 230 Chapter 5 • Resource Managers April 30, 2009
© 2009, QNX Software Systems GmbH & Co. KG. Alphabetical listing of connect and I/O functions typedef union { struct _io_chmod i; } io_chmod_t; Description: Responsible for changing the mode for the resource identified by the passed ocb to the value specified by the mode message member. Returns: The status via the helper macro _RESMGR_STATUS. io_chown() int io_chown (resmgr_context_t *ctp, io_chown_t *msg, RESMGR_OCB_T *ocb) Classification: I/O function Default handler: iofunc_chown_default() Helper functions: iofunc_chown() Client functions: chown(), fchown() Messages: _IO_CHOWN Data structure: struct _io_chown { uint16_t type; uint16_t combine_len; int32_t gid; int32_t uid; }; typedef union { struct _io_chown i; } io_chown_t; Description: Responsible for changing the user ID and group ID fields for the resource identified by the passed ocb to uid and gid, respectively. Note that the mount structure flag IOFUNC_PC_CHOWN_RESTRICTED and the OCB flag field should be examined to determine whether the filesystem allows chown() to be performed by non-root users. Returns: The status via the helper macro _RESMGR_STATUS. io_close_dup() int io_close_dup (resmgr_context_t *ctp, io_close_t *msg, RESMGR_OCB_T *ocb) Classification: I/O function Default handler: iofunc_close_dup_default() Helper functions: iofunc_close_dup() Client functions: close(), fclose() Messages: _IO_CLOSE_DUP April 30, 2009 Chapter 5 • Resource Managers 231
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QNX Neutrino RTOS Getting Started w
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Contents About This Guide xi What y
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© 2009, QNX Software Systems GmbH
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List of Figures A process as a cont
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About This Guide April 30, 2009 Abo
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Chapter 3 Clocks, Timers, and Getti
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Using timers © 2009, QNX Software
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Chapter 4 Interrupts In this chapte
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Neutrino and interrupts © 2009, QN
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Writing interrupt handlers © 2009,
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Appendix B Calling 911 In this appe
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Seeking professional help © 2009,
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Seeking professional help © 2009,
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Appendix C Sample Programs In this
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Getting Started with QNX Neutrino - QNX Software Systems

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