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28 .\" From: @(#)getgrent.3 8.2 (Berkeley) 4/19/94
29 .\" $FreeBSD: src/lib/libc/gen/getgrent.3,v 1.28 2007/01/09 00:27:53 imp Exp $
46 .Nd group database operations
55 .\".Fn getgrent_r "struct group *grp" "char *buffer" "size_t bufsize" "struct group **result"
57 .Fn getgrnam "const char *name"
59 .Fn getgrnam_r "const char *name" "struct group *grp" "char *buffer" "size_t bufsize" "struct group **result"
61 .Fn getgrgid "gid_t gid"
63 .Fn getgrgid_r "gid_t gid" "struct group *grp" "char *buffer" "size_t bufsize" "struct group **result"
65 .Fn getgruuid "uuid_t uuid"
67 .Fn getgruuid_r "uuid_t uuid" "struct group *grp" "char *buffer" "size_t bufsize" "struct group **result"
69 .Fn setgroupent "int stayopen"
75 .\"These functions operate on the group database file
76 These functions obtain information from
77 .Xr opendirectoryd 8 ,
83 Each line of the database is defined by the structure
88 .Bd -literal -offset indent
90 char *gr_name; /* group name */
91 char *gr_passwd; /* group password */
92 gid_t gr_gid; /* group id */
93 char **gr_mem; /* group members */
102 search the group database for the given group name pointed to by
104 the group id given by
108 respectively, returning the first one encountered.
110 names, group gids, or uuids may result in undefined behavior.
112 Note that the groups file
114 does not contain group UUIDs.
115 The UUID for a group may be found using
116 .Fn mbr_gid_to_uuid .
118 On Mac OS X, these routines are thread-safe and return a pointer to a
119 thread-specific data structure. The contents of this data
120 structure are automatically released by subsequent calls to
121 any of these routines on the same thread, or when the thread exits.
122 These routines are therefore unsuitable for use in libraries or frameworks,
123 from where they may overwrite the per-thread data that the calling
124 application expects to find as a result of its own calls to these
125 routines. Library and framework code should use the alternative reentrant
126 variants detailed below.
131 sequentially reads the group database and is intended for programs
132 that wish to step through the complete list of groups.
139 are alternative versions of
145 The caller must provide storage for the results of the search in
153 When these functions are successful, the
155 argument will be filled-in, and a pointer to that argument will be
158 If an entry is not found or an error occurs,
163 These functions will open the group file for reading, if necessary.
168 opens the file, or rewinds it if it is already open.
171 is non-zero, file descriptors are left open, significantly speeding
172 functions subsequent calls.
173 This functionality is unnecessary for
175 as it does not close its file descriptors by default.
177 be noted that it is dangerous for long-running programs to use this
178 functionality as the group file may be updated.
185 with an argument of zero.
190 closes any open files.
197 return a pointer to a group structure on success or
199 if the entry is not found or if an error occurs.
200 If an error does occur,
203 Note that programs must explicitly set
205 to zero before calling any of these functions if they need to
206 distinguish between a non-existent entry and an error.
212 return 0 if no error occurred, or an error number to indicate failure.
213 It is not an error if a matching entry is not found.
218 and the return value is 0, no matching entry exists.)
221 returns the value 1 if successful, otherwise the value
228 have no return value.
230 .Bl -tag -width /etc/group -compact
235 The historic function
237 which allowed the specification of alternate group databases, has
238 been deprecated and is no longer available.
242 .Xr mbr_gid_to_uuid 3,
243 .Xr opendirectory 8 ,
258 function differs from that standard in that its return type is
290 appeared in Mac OS X 10.8.
300 leave their results in an internal thread-specific memory and return
301 a pointer to that object.
304 will modify the same object.