View Source: getprotobyname(3) - Waikato Linux Users Group

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GETPROTOENT
!!!GETPROTOENT
NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
FILES
CONFORMING TO
SEE ALSO
----
!!NAME


getprotoent, getprotobyname, getprotobynumber, setprotoent, endprotoent - get protocol entry
!!SYNOPSIS


__#include
__''name''__);
struct protoent *getprotobynumber(int__ ''proto''__);
void setprotoent(int__ ''stayopen''__);
void endprotoent(void);
__
!!DESCRIPTION


The __getprotoent()__ function reads the next line from
the file ''/etc/protocols'' and returns a structure
''protoent'' containing the broken out fields from the
line. The ''/etc/protocols'' file is opened if
necessary.


The __getprotobyname()__ function returns a
''protoent'' structure for the line from
''/etc/protocols'' that matches the protocol name
''name''.


The __getprotobynumber()__ function returns a
''protoent'' structure for the line that matches the
protocol number ''number''.


The __setprotoent()__ function opens and rewinds the
''/etc/protocols'' file. If ''stayopen'' is true (1),
then the file will not be closed between calls to
__getprotobyname()__ or
__getprotobynumber()__.


The __endprotoent()__ function closes
''/etc/protocols''.


The ''protoent'' structure is defined in
'''' as follows:


struct protoent {
char    *p_name;        /* official protocol name */
char    **p_aliases;    /* alias list */
int     p_proto;        /* protocol number */
}


The members of the ''protoent'' structure
are:


''p_name''


The official name of the protocol.


''p_aliases''


A zero terminated list of alternative names for the
protocol.


''p_proto''


The protocol number.
!!RETURN VALUE


The __getprotoent()__, __getprotobyname()__ and
__getprotobynumber()__ functions return the
''protoent'' structure, or a NULL pointer if an error
occurs or the end of the file is reached.
!!FILES


''/etc/protocols''


protocol database file
!!CONFORMING TO


BSD 4.3
!!SEE ALSO


getservent(3), getnetent(3),
protocols(5)
----

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Last edited on Tuesday, June 4, 2002 12:24:22 am by "perry"

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