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GETPWNAM(3) Linux Programmer’s Manual GETPWNAM(3)
NAME
getpwnam, getpwnam_r, getpwuid, getpwuid_r - get password file entry
SYNOPSIS
#include <sys/types.h>
#include <pwd.h>
struct passwd *getpwnam(const char *name);
struct passwd *getpwuid(uid_t uid);
int getpwnam_r(const char *name, struct passwd *pwbuf,
char *buf, size_t buflen, struct passwd **pwbufp);
int getpwuid_r(uid_t uid, struct passwd *pwbuf,
char *buf, size_t buflen, struct passwd **pwbufp);
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 getpwnam_r() and getpwuid_r() functions find the same information, but store
the retrieved passwd structure in the space pointed to by pwbuf. This passwd
structure contains pointers to strings, and these strings are stored in the buffer
buf of size buflen. A pointer to the result (in case of success) or NULL (in case
no entry was found or an error occurred) is stored in *pwbufp.
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 */
};
The maximum needed size for buf can be found using sysconf(3) with the
_SC_GETPW_R_SIZE_MAX parameter.
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. If an error occurs,
errno is set appropriately. If one wants to check errno after the call, it should
be set to zero before the call.
The return value may point to static area, and may be overwritten by subsequent
calls to getpwent(), getpwnam(), or getpwuid().
The getpwnam_r() and getpwuid_r() functions return zero on success. In case of
error, an error value is returned.
ERRORS
0 or ENOENT or ESRCH or EBADF or EPERM or ...
The given name or uid was not found.
ENOMEM Insufficient memory to allocate passwd structure.
EIO I/O error.
EINTR A signal was caught.
EMFILE The maximum number (OPEN_MAX) of files was open already in the calling pro-
cess.
ENFILE The maximum number of files was open already in the system.
ERANGE Insufficient buffer space supplied.
FILES
/etc/passwd
password database file
CONFORMING TO
SVID 3, BSD 4.3, POSIX 1003.1-2003
NOTES
The formulation given above under "RETURN VALUE" is from POSIX 1003.1-2001. It
does not call "not found" an error, hence does not specify what value errno might
have in this situation. But that makes it impossible to recognize errors. One might
argue that according to POSIX errno should be left unchanged if an entry is not
found. Experiments on various Unix-like systems shows that lots of different values
occur in this situation: 0, ENOENT, EBADF, ESRCH, EWOULDBLOCK, EPERM and probably
others.
SEE ALSO
fgetpwent(3), getgrnam(3), getpwent(3), setpwent(3), endpwent(3), getpw(3), putp-
went(3), passwd(5)
GNU 1996-05-27 GETPWNAM(3)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache/1.3.41 (Unix) PHP/5.2.5 mod_perl/1.30 mod_gzip/1.3.26.1a
Under GNU General Public License
2008-12-02 07:18 @38.103.63.58 CrawledBy CCBot/1.0 (+http://www.commoncrawl.org/bot.html)