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GETPWENT(3)		   Linux Programmer's Manual		   GETPWENT(3)

NAME
       getpwent, setpwent, endpwent - get password file entry

SYNOPSIS
       #include <sys/types.h>
       #include <pwd.h>

       struct passwd *getpwent(void);

       void setpwent(void);

       void endpwent(void);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       getpwent(), setpwent(), endpwent():
	   _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 ||
	   _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED

DESCRIPTION
       The getpwent() function returns a pointer to a structure containing the
       broken-out  fields  of  a  record from the password database (e.g., the
       local password file /etc/passwd, NIS, and LDAP).	 The first time	 getp‐
       went()  is  called,  it returns the first entry; thereafter, it returns
       successive entries.

       The setpwent() function rewinds to the beginning of the password	 data‐
       base.

       The  endpwent()	function  is used to close the password database after
       all processing has been performed.

       The passwd structure is defined in <pwd.h> as follows:

	   struct passwd {
	       char   *pw_name;	      /* username */
	       char   *pw_passwd;     /* user password */
	       uid_t   pw_uid;	      /* user ID */
	       gid_t   pw_gid;	      /* group ID */
	       char   *pw_gecos;      /* user information */
	       char   *pw_dir;	      /* home directory */
	       char   *pw_shell;      /* shell program */
	   };

       For more information about the fields of this structure, see passwd(5).

RETURN VALUE
       The getpwent() function returns a pointer to  a	passwd	structure,  or
       NULL  if	 there	are  no	 more entries or an error occurs.  If an error
       occurs, errno is set appropriately.  If one wants to check errno	 after
       the call, it should be set to zero before the call.

       The  return value may point to a static area, and may be overwritten by
       subsequent calls to getpwent(), getpwnam(3), or getpwuid(3).   (Do  not
       pass the returned pointer to free(3).)

ERRORS
       EINTR  A signal was caught.

       EIO    I/O error.

       EMFILE The  maximum  number (OPEN_MAX) of files was open already in the
	      calling process.

       ENFILE The maximum number of files was open already in the system.

       ENOMEM Insufficient memory to allocate passwd structure.

       ERANGE Insufficient buffer space supplied.

FILES
       /etc/passwd
	      local password database file

ATTRIBUTES
   Multithreading (see pthreads(7))
       The getpwent() function is not thread-safe.

       The setpwent() and endpwent() functions are thread-safe.

CONFORMING TO
       SVr4, 4.3BSD, POSIX.1-2001.  The pw_gecos field	is  not	 specified  in
       POSIX, but is present on most implementations.

SEE ALSO
       fgetpwent(3),  getpw(3), getpwent_r(3), getpwnam(3), getpwuid(3), putp‐
       went(3), passwd(5)

COLOPHON
       This page is part of release 3.58 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

GNU				  2013-06-21			   GETPWENT(3)
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