| Linux / Unix Command: getgroups |
NAME
getgroups, setgroups - get/set list of supplementary group IDsSYNOPSIS
#include <sys/types.h>#include <unistd.h>
int getgroups(int size, gid_t list[]);
#include <grp.h>
int setgroups(size_t size, const gid_t *list);
DESCRIPTION
- getgroups
- Up to size supplementary group IDs are returned in list. It is unspecified whether the effective group ID of the calling process is included in the returned list. (Thus, an application should also call getegid(2) and add or remove the resulting value.) If size is zero, list is not modified, but the total number of supplementary group IDs for the process is returned.
- setgroups
- Sets the supplementary group IDs for the process. Only the super-user may use this function.
RETURN VALUE
- getgroups
- On success, the number of supplementary group IDs is returned. On error, -1 is returned, and errno is set appropriately.
- setgroups
- On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORS
- EFAULT
- list has an invalid address.
- EPERM
- For setgroups, the user is not the super-user.
- EINVAL
- For setgroups, size is greater than NGROUPS (32 for Linux 2.0.32). For getgroups, size is less than the number of supplementary group IDs, but is not zero.
SEE ALSO
initgroups(3), getgid(2), setgid(2)
Important: Use the man command (% man) to see how a command is used on your particular computer.
