getpw(3) [x11r4 man page]

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

NAME

       getpw - reconstruct password line entry

SYNOPSIS

       #define _GNU_SOURCE	       /* See feature_test_macros(7) */
       #include <sys/types.h>
       #include <pwd.h>

       int getpw(uid_t uid, char *buf);

DESCRIPTION

       The getpw() function reconstructs the password line entry for the given user ID uid in the buffer buf.  The returned buffer contains a line
       of format

	   name:passwd:uid:gid:gecos:dir:shell

       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 getpw() function returns 0 on success; on error, it returns -1, and errno is set to indicate the error.

       If uid is not found in the password database, getpw() returns -1, sets errno to 0, and leaves buf unchanged.

ERRORS

       0 or ENOENT
	      No user corresponding to uid.

       EINVAL buf is NULL.

       ENOMEM Insufficient memory to allocate passwd structure.

FILES

       /etc/passwd
	      password database file

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +----------+---------------+----------------+
       |Interface | Attribute	  | Value	   |
       +----------+---------------+----------------+
       |getpw()   | Thread safety | MT-Safe locale |
       +----------+---------------+----------------+

CONFORMING TO

       SVr2.

BUGS

       The getpw() function is dangerous as it may overflow the provided buffer buf.  It is obsoleted by getpwuid(3).

SEE ALSO

       endpwent(3), fgetpwent(3), getpwent(3), getpwnam(3), getpwuid(3), putpwent(3), setpwent(3), passwd(5)

COLOPHON

       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

GNU
								    2017-09-15								  GETPW(3)

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

NAME

       fgetpwent - get password file entry

SYNOPSIS

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

       struct passwd *fgetpwent(FILE *stream);

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

       fgetpwent():
	   Since glibc 2.19:
	       _DEFAULT_SOURCE
	   Glibc 2.19 and earlier:
	       _SVID_SOURCE

DESCRIPTION

       The fgetpwent() function returns a pointer to a structure containing the broken out fields of a line in the file stream.  The first time it
       is called it returns the first entry; thereafter, it returns successive entries.  The file referred to by stream must have the same  format
       as /etc/passwd (see passwd(5)).

       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;      /* real name */
	       char   *pw_dir;	      /* home directory */
	       char   *pw_shell;      /* shell program */
	   };

RETURN VALUE

       The fgetpwent() function returns a pointer to a passwd structure, or NULL if there are no more entries or an error occurs.  In the event of
       an error, errno is set to indicate the cause.

ERRORS

       ENOMEM Insufficient memory to allocate passwd structure.

FILES

       /etc/passwd
	      password database file

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +------------+---------------+--------------------------+
       |Interface   | Attribute     | Value		       |
       +------------+---------------+--------------------------+
       |fgetpwent() | Thread safety | MT-Unsafe race:fgetpwent |
       +------------+---------------+--------------------------+
CONFORMING TO

       SVr4.

SEE ALSO

       endpwent(3), fgetpwent_r(3), fopen(3), getpw(3), getpwent(3), getpwnam(3), getpwuid(3), putpwent(3), setpwent(3), passwd(5)

COLOPHON

       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

GNU
								    2018-02-02							      FGETPWENT(3)