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getpwnam(3) [redhat man page]

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

NAME
getpwnam, getpwuid - get password file entry SYNOPSIS
#include <pwd.h> #include <sys/types.h> struct passwd *getpwnam(const char *name); struct passwd *getpwuid(uid_t uid); DESCRIPTION
The getpwnam() function returns a pointer to a structure containing the broken out fields of a line from /etc/passwd for the entry that matches the user name name. The getpwuid() function returns a pointer to a structure containing the broken out fields of a line from /etc/passwd for the entry that matches the user uid uid. The passwd structure is defined in <pwd.h> as follows: struct passwd { char *pw_name; /* user name */ 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 getpwnam() and getpwuid() functions return a pointer to the passwd structure, or NULL if the matching entry is not found or an error occurs. ERRORS
ENOMEM Insufficient memory to allocate passwd structure. FILES
/etc/passwd password database file CONFORMING TO
SVID 3, POSIX, BSD 4.3 SEE ALSO
fgetpwent(3), getgrnam(3), getpwent(3), setpwent(3), endpwent(3), getpw(3), putpwent(3), passwd(5) GNU
1996-05-27 GETPWNAM(3)

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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)

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