Regarding Function and Pointers.


 
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Old 05-25-2004
Regarding Function and Pointers.

HI,

Here is some thing that is puzzling me from a long time.
Can some body explain me this with example.

The question is :-

What is the difference between function pointer and pointer to a function.

Where do we actually use the function pointers and pointer to functions.

Thanks in Advance.
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smfi_replacebody(3N)													      smfi_replacebody(3N)

NAME
smfi_replacebody() - replaces the data in the sendmail message body SYNOPSIS
PARAMETERS
ctx Specifies the opaque context structure. bodyp Specifies a pointer to the start of the new body data, which does not have to be null-terminated. If bodyp is set to NULL, the length of the body is considered to be 0 (zero). The body data must be in CR or LF form. bodylen Specifies the number of data bytes pointed by bodyp. DESCRIPTION
replaces the body of the current message. can be called only from the routine and can be called more than once. When is called more than once, the subsequent calls append data to the new body of the message. Notes o As the message body may be very large, setting may significantly affect filter performance. o If a filter sets but does not call the original body remains unchanged. o The filter order is important for the routine. Filters placed later in the sequence will observe the changes RETURN VALUE
fails and returns due to the following reasons: o The value of bodyp is equal to NULL and the value of bodylen is greater than 0. o Changing the body in the current connection state is invalid. o Network error occurs. o The is not set when the function is called. AUTHOR
was developed by the Sendmail Inc. SEE ALSO
smfi_chgheader(3N), smfi_insheader(3N), smfi_addrcpt(3N), smfi_addheader(3N), smfi_delrcpt(3N). on smfi_replacebody(3N)