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GNU/Linux man pages

Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :

ISBN : 978-2-7460-9712-4
EAN : 9782746097124
(Editions ENI)

GNU/Linux

CentOS 4.8

i386

getgrent(3)


GETGRENT

GETGRENT

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
FILES
CONFORMING TO
SEE ALSO

NAME

getgrent, setgrent, endgrent − get group file entry

SYNOPSIS

#include <sys/types.h>
#include <grp.h>

struct group *getgrent(void);

void setgrent(void);

void endgrent(void);

DESCRIPTION

The getgrent() function returns a pointer to a structure containing the group information from /etc/group. The first time it is called it returns the first entry; thereafter, it returns successive entries.

The setgrent() function rewinds the file pointer to the beginning of the /etc/group file.

The endgrent() function closes the /etc/group file.

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 */
};

RETURN VALUE

The getgrent() function returns the group information structure, or NULL if there are no more entries or an error occurs.

Upon error, errno may be set. If you want to check its value, set it to zero before the call.

ERRORS

EINTR

A signal was caught.

EIO

I/O error.

EMFILE

The calling process already has too many open files.

ENFILE

Too many open files in the system.

ENOMEM

Insufficient memory to allocate group information structure.

FILES

/etc/group

group database file

CONFORMING TO

SVID 3, BSD 4.3, POSIX 1003.1-2003.

SEE ALSO

fgetgrent(3), getgrent_r(3), getgrgid(3), getgrnam(3),



getgrent(3)