Linux repositories inspector
GNU
2017-09-15

manpages-dev

Manual pages about using GNU/Linux for development

man-pages

Linux kernel and C library user-space interface documentation

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
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).
⇧ Top