getaliasbyname_r man page on YellowDog

Man page or keyword search:  
man Server   18644 pages
apropos Keyword Search (all sections)
Output format
YellowDog logo
[printable version]

SETALIASENT(3)		 access mail aliases database		SETALIASENT(3)

NAME
       setaliasent,  endaliasent,  getaliasent, getaliasent_r, getaliasbyname,
       getaliasbyname_r - read an alias entry

SYNOPSIS
       #include <aliases.h>

       void setaliasent(void);

       void endaliasent(void);

       struct aliasent *getaliasent(void);

       int getaliasent_r(struct aliasent *result,
	   char *buffer, size_t buflen, struct aliasent **res);

       struct aliasent *getaliasbyname(const char *name);

       int getaliasbyname_r(const char *name,
	   struct aliasent *result,
	   char *buffer, size_t buflen, struct aliasent **res);

DESCRIPTION
       One of the databases available with the Name Service  Switch  (NSS)  is
       the  aliases  database,	that contains mail aliases. (To find out which
       databases are supported, try  getent --help .)  Six functions are  pro‐
       vided to access the aliases database.

       The  getaliasent() function returns a pointer to a structure containing
       the group information from the aliases database.	 The first time it  is
       called  it  returns  the first entry; thereafter, it returns successive
       entries.

       The setaliasent() function rewinds the file pointer to the beginning of
       the aliases database.

       The endaliasent() function closes the aliases database.

       getaliasent_r()	is the reentrant version of the previous function. The
       requested structure is stored via the first argument but the programmer
       needs  to  fill	the  other  arguments also. Not providing enough space
       causes the function to fail.

       The function getaliasbyname() takes the name argument and searches  the
       aliases	database.  The	entry  is  returned  as	 a pointer to a struct
       aliasent.

       getaliasbyname_r() is the reentrant version of the  previous  function.
       The  requested structure is stored via the second argument but the pro‐
       grammer need to fill the other arguments	 also.	Not  providing	enough
       space causes the function to fail.

       The struct aliasent is defined in <aliases.h>.
       struct aliasent {
	   char *alias_name;		  /* alias name */
	   size_t alias_members_len;
	   char **alias_members;	  /* alias name list */
	   int alias_local;
       };

FILES
       The  default  alias  database  is  the  file /etc/aliases.  This can be
       changed in the /etc/nsswitch.conf file.

RETURN VALUE
       The functions getaliasent_r() and getaliasbyname_r() return a  non-zero
       value on error.

EXAMPLE
       The  following example compiles with gcc example.c -o example.  It will
       dump all names in the alias database.

       #include <aliases.h>
       #include <stdio.h>
       #include <stdlib.h>
       #include <errno.h>

       int main() {
	 struct aliasent *al;
	 setaliasent();
	 for (;;) {
	   al = getaliasent();
	   if (al == NULL) break;
	   printf("Name: %s\n", al->alias_name);
	 }
	 if (errno) {
	     perror("reading alias");
	     exit(EXIT_FAILURE);
	 }
	 endaliasent();
	 exit(EXIT_SUCCESS);
       }

CONFORMING TO
       These routines are glibc-specific.  The NeXT has similar routines
	      #include <aliasdb.h>
	      void alias_setent(void);
	      void alias_endent(void);
	      alias_ent *alias_getent(void);
	      alias_ent *alias_getbyname(char *name);

SEE ALSO
       getgrent(3), getpwent(3), getspent(3), aliases(5)

GNU				  2003-09-09			SETALIASENT(3)
[top]

List of man pages available for YellowDog

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net