sia_get_groups - retrieve user's group information for SIA (Security Integration Architecture)
Standard C library (libc.so and libc.a)
int sia_get_groups( const char *username gid_t basegid gid_t *buffer int *ngroups)
The name of the user whose group information should be written to the buffer array. This parameter is read only. If not ((gid_t)-1), this GID will appear in the buffer array in addition to any other groups found for this user. This is normally used to pass the user's GID from the password information, since the GID is not necessarily listed in the group information obtained with getgrent(). The array into which this routine writes the accumulated GIDs for the specified user. On input, this parameter points to an integer that represents the maximum number of entries allowed for the buffer array. When this routine returns, it updates this value to be the number of entries which were found. On failure, the value is indeterminate.
The sia_get_groups() routine is called to obtain a user's group array.
A typical call to obtain a user's group array follows:
struct passwd *pw;
extern char *username;
pw = getpwnam(username);
if (pw == NULL)
ngroups = NGROUPS;
if (sia_get_groups(username, pw->pw_gid, groups, &ngroups)
/* process group array here */
This routine returns SIA_SUCCESS if all the incoming arguments are correct (non-null pointers, non-null username, and *ngroups must be positive), and if none of the configured mechanism functions for group processing returned a fatal error. Finding more than *ngroups GIDs for the user is one such fatal error, and is the only one defined for all mechanisms. If a fatal error is encountered in one of the configured mechanisms, this routine returns SIAFAIL|SIASTOP. If there are parameter errors, or if a getgrent_r call fails, this routine returns SIAFAIL.
While errno will usually be propagated from whatever other calls failed, this routine will return with errno explicitly set for the following conditions: One of the pointer arguments was NULL. *username was 0, or *ngroups was not positive. Thread context failure while scanning for groups.
getgrent(3), matrix.conf(4), initgroups(3), siad_get_groups(3) _sia_isagroup(3)
Security delim off