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Test Your Knowledge in Computers #567
Difficulty: Medium
The ternary if-then-else operator generally has the following syntax: E ? X : Y where E is a Boolean expression and if true, the statement is assigned the value Y.
True or False?
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_fini(9e) [bsd man page]

_fini(9E)							Driver Entry Points							 _fini(9E)

NAME
_fini, _info, _init - loadable module configuration entry points SYNOPSIS
#include <sys/modctl.h> int _fini(void); int _info(struct modinfo *modinfop); int _init(void); INTERFACE LEVEL
Solaris DDI specific (Solaris DDI). These entry points are required. You must write them. PARAMETERS
_info() modinfop A pointer to an opaque modinfo structure. DESCRIPTION
_init() initializes a loadable module. It is called before any other routine in a loadable module. _init() returns the value returned by mod_install(9F). The module may optionally perform some other work before the mod_install(9F) call is performed. If the module has done some setup before the mod_install(9F) function is called, then it should be prepared to undo that setup if mod_install(9F) returns an error. _info() returns information about a loadable module. _info() returns the value returned by mod_info(9F). _fini() prepares a loadable module for unloading. It is called when the system wants to unload a module. If the module determines that it can be unloaded, then _fini() returns the value returned by mod_remove(9F). Upon successful return from _fini() no other routine in the module will be called before _init() is called. RETURN VALUES
_init() should return the appropriate error number if there is an error, otherwise it should return the return value from mod_install(9F). _info() should return the return value from mod_info(9F) _fini() should return the return value from mod_remove(9F). _fini() is permitted to return EBUSY prior to calling mod_remove(9F) if the driver should not be unloaded. Driver global resources, such as mutexes and calls to ddi_soft_state_fini(9F), should only be destroyed in _fini() after mod_remove() returns successfully. EXAMPLES
Example 1: Initializing and Freeing a Mutex The following example demonstrates how to initialize and free a mutex(9F). #include <sys/modctl.h> #include <sys/ddi.h> #include <sys/sunddi.h> static struct dev_ops drv_ops; /* * Module linkage information for the kernel. */ static struct modldrv modldrv = { &mod_driverops, /* Type of module. This one is a driver */ "Sample Driver", &drv_ops /* driver ops */ }; static struct modlinkage modlinkage = { MODREV_1, &modldrv, NULL }; /* * Global driver mutex */ static kmutex_t xx_global_mutex; int _init(void) { int i; /* * Initialize global mutex before mod_install'ing driver. * If mod_install() fails, must clean up mutex initialization */ mutex_init(&xx_global_mutex, NULL, MUTEX_DRIVER, (void *)NULL); if ((i = mod_install(&modlinkage)) != 0) { mutex_destroy(&xx_global_mutex); } return (i); } int _info(struct modinfo *modinfop) { return (mod_info(&modlinkage, modinfop)); } int _fini(void) { int i; /* * If mod_remove() is successful, we destroy our global mutex */ if ((i = mod_remove(&modlinkage)) == 0) { mutex_destroy(&xx_global_mutex); } return (i); } SEE ALSO
add_drv(1M), mod_info(9F), mod_install(9F), mod_remove(9F), mutex(9F), modldrv(9S), modlinkage(9S), modlstrmod(9S) Writing Device Drivers WARNINGS
Do not change the structures referred to by the modlinkage structure after the call to mod_install(), as the system may copy or change them. NOTES
Even though the identifiers _fini(), _info(), and _init() appear to be declared as globals, their scope is restricted by the kernel to the module that they are defined in. BUGS
On some implementations _info() may be called before _init(). SunOS 5.10 22 Jan 2002 _fini(9E)

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