man:getpw
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), putp- went(3), setpwent(3), passwd(5)
COLOPHON
This page is part of release 4.16 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)
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