about option_t
typedef struct {
char *name; /* name of the option */
enum opt_type type;
void *addr;
char *description;
unsigned int flags;
void *addr2;
int upper_limit;
int lower_limit;
const char *source;
short int priority;
short int winner;
} option_t;Which piece of code call the void *addr. some plugins uses this pointer to call functions when the plugin loads. BTW, what is the exactly meaning of each value of enum opt_type struct? Thanks a lot!
2008-05-05
Quoted 3 lines · On Mon, May 05, 2008 at 03:34:29PM +0800, [email protected] wrote:
Which piece of code call the void *addr. some plugins uses this pointer to call functions when the plugin loads. BTW, what is the exactly meaning of each value of enum
opt_typestruct? Thanks a lot!
Not an interesting question, sorry. Refer to the PPP source. It is truly fascinating and well coded. Explore references to the option_t typedef. Take particular note of ->addr and where o_bool appears in the source. It is amazing. Truly, amazing. Use a capable editor and cross referencing tool. I use emacs with etags, but you might find something else more appropriate.
Signature · 1 line
James Cameron
Quoted 1 line · [email protected] writes:
Which piece of code call the void *addr.
'addr' is a type-dependent value. It's not necessarily called as a function -- that only happens if the type is o_special, o_special_noarg, or o_wild.
Quoted 1 line
some plugins uses this pointer to call functions when the plugin loads. BTW, what is the exactly meaning of each value of enum
opt_typestruct? Thanks a lot!
The values should be relatively self-explanatory, if you read the code in options.c or examine any of the code that uses the options.
o_special_noarg - option is processed by a function call and consumes no other arguments.
o_special - option processed by function call and consumes one more argument.
o_bool - option address is a 'bool' to be set to the lower 8 bits of 'flags'. If 'addr2' is set, use the OPT_A2{COPY,CLR,CLRB,OR) to determine what is done to that value.
o_int - parse an integer, offset by low 8 bits of 'flags', and store in 'addr'.
o_wild - special self-identifying option (no keyword; parsed by appearance). Used only for IPv4 addresses, device name, and tty speed.
Signature · 1 line
James Carlson 42.703N 71.076W <[email protected]>
thanks for you help!
2008-05-05
·¢¼şÈË£º James Carlson
·¢ËÍʱ¼ä£º 2008-05-05 19:41:21
ÊÕ¼şÈË£º [email protected]
³ËÍ£º linux-ppp
Ö÷Ì⣺ Re: about option_t
Quoted 1 line · [email protected] writes:
Which piece of code call the void *addr.
'addr' is a type-dependent value. It's not necessarily called as a function -- that only happens if the type is o_special, o_special_noarg, or o_wild.
Quoted 1 line
some plugins uses this pointer to call functions when the plugin loads. BTW, what is the exactly meaning of each value of enum
opt_typestruct? Thanks a lot!
The values should be relatively self-explanatory, if you read the code in options.c or examine any of the code that uses the options.
o_special_noarg - option is processed by a function call and consumes no other arguments.
o_special - option processed by function call and consumes one more argument.
o_bool - option address is a 'bool' to be set to the lower 8 bits of 'flags'. If 'addr2' is set, use the OPT_A2{COPY,CLR,CLRB,OR) to determine what is done to that value.
o_int - parse an integer, offset by low 8 bits of 'flags', and store in 'addr'.
o_wild - special self-identifying option (no keyword; parsed by appearance). Used only for IPv4 addresses, device name, and tty speed.
Signature · 4 lines
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