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GETGRNAM(3) Linux Programmer’s Manual GETGRNAM(3)
NAME
getgrnam, getgrnam_r, getgrgid, getgrgid_r - get group file entry
SYNOPSIS
#include <sys/types.h>
#include <grp.h>
struct group *getgrnam(const char *name);
struct group *getgrgid(gid_t gid);
int getgrnam_r(const char *name, struct group *gbuf,
char *buf, size_t buflen, struct group **gbufp);
int getgrgid_r(gid_t gid, struct group *gbuf,
char *buf, size_t buflen, struct group **gbufp);
DESCRIPTION
The getgrnam() function returns a pointer to a structure containing the group
information from /etc/group for the entry that matches the group name name.
The getgrgid() function returns a pointer to a structure containing the group
information from /etc/group for the entry that matches the group gid gid.
The getgrnam_r() and getgrgid_r() functions find the same information, but store
the retrieved group structure in the space pointed to by gbuf. This group struc-
ture 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 *gbufp.
The group structure is defined in <grp.h> as follows:
struct group {
char *gr_name; /* group name */
char *gr_passwd; /* group password */
gid_t gr_gid; /* group id */
char **gr_mem; /* group members */
};
The maximum needed size for buf can be found using sysconf(3) with the
_SC_GETGR_R_SIZE_MAX parameter.
RETURN VALUE
The getgrnam() and getgrgid() functions return a pointer to the group information
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 getgrent(), getgrgid(), or getgrnam().
The getgrnam_r() and getgrgid_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 gid was not found.
ENOMEM Insufficient memory.
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/group
group 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
fgetgrent(3), getgrent(3), setgrent(3), endgrent(3), getpwnam(3), group(5)
2003-11-15 GETGRNAM(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 05:37 @38.103.63.58 CrawledBy CCBot/1.0 (+http://www.commoncrawl.org/bot.html)