1GETSERVENT(3)              Linux Programmer's Manual             GETSERVENT(3)
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NAME

6       getservent,  getservbyname, getservbyport, setservent, endservent - get
7       service entry
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SYNOPSIS

10       #include <netdb.h>
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12       struct servent *getservent(void);
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14       struct servent *getservbyname(const char *name, const char *proto);
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16       struct servent *getservbyport(int port, const char *proto);
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18       void setservent(int stayopen);
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20       void endservent(void);
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DESCRIPTION

23       The getservent() function reads the next line from the  file  /etc/ser‐
24       vices  and returns a structure servent containing the broken out fields
25       from the line.  The /etc/services file is opened if necessary.
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27       The getservbyname() function returns a servent structure for  the  line
28       from  /etc/services that matches the service name using protocol proto.
29       If proto is NULL, any protocol will be matched.
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31       The getservbyport() function returns a servent structure for  the  line
32       that  matches  the port port given in network byte order using protocol
33       proto. If proto is NULL, any protocol will be matched.
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35       The setservent() function opens and rewinds the /etc/services file.  If
36       stayopen is true (1), then the file will not be closed between calls to
37       getservbyname() and getservbyport().
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39       The endservent() function closes /etc/services.
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41       The servent structure is defined in <netdb.h> as follows:
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43              struct servent {
44                      char    *s_name;        /* official service name */
45                      char    **s_aliases;    /* alias list */
46                      int     s_port;         /* port number */
47                      char    *s_proto;       /* protocol to use */
48              }
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50       The members of the servent structure are:
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52       s_name The official name of the service.
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54       s_aliases
55              A zero terminated list of alternative names for the service.
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57       s_port The port number for the service given in network byte order.
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59       s_proto
60              The name of the protocol to use with this service.
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RETURN VALUE

63       The getservent(), getservbyname() and getservbyport() functions  return
64       the  servent structure, or a NULL pointer if an error occurs or the end
65       of the file is reached.
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FILES

68       /etc/services
69              services database file
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CONFORMING TO

72       4.3BSD, POSIX.1-2001.
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SEE ALSO

75       getnetent(3), getprotoent(3), services(5)
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79BSD                               2001-07-25                     GETSERVENT(3)
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