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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | FILES | ATTRIBUTES | CONFORMING TO | BUGS | SEE ALSO | COLOPHON |
GETPW(3) Linux Programmer's Manual GETPW(3)
getpw - reconstruct password line entry
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <sys/types.h>
#include <pwd.h>
int getpw(uid_t uid, char *buf);
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).
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.
0 or ENOENT
No user corresponding to uid.
EINVAL buf is NULL.
ENOMEM Insufficient memory to allocate passwd structure.
/etc/passwd
password database file
For an explanation of the terms used in this section, see
attributes(7).
┌──────────┬───────────────┬────────────────┐
│Interface │ Attribute │ Value │
├──────────┼───────────────┼────────────────┤
│getpw() │ Thread safety │ MT-Safe locale │
└──────────┴───────────────┴────────────────┘
SVr2.
The getpw() function is dangerous as it may overflow the provided
buffer buf. It is obsoleted by getpwuid(3).
endpwent(3), fgetpwent(3), getpwent(3), getpwnam(3), getpwuid(3),
putpwent(3), setpwent(3), passwd(5)
This page is part of release 4.12 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 2015-07-23 GETPW(3)
Pages that refer to this page: fgetpwent(3), getpwent(3), getpwent_r(3), getpwnam(3), putpwent(3)