getpw

(3)

reconstruct password line entry

#define _GNU_SOURCE /* See feature_test_macros(7) */ #include <sys/types.h> #include <pwd.h> [[deprecated]] int getpw(uid_t uid, char *buf);

LIBRARY

Standard C library (libc, -lc)

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

STANDARDS

None.

HISTORY

SVr2.

BUGS

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