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int getgroups(int size, gid_t list[]);
#include <grp.h>
int setgroups(size_t size, const gid_t *list);
Tag | Description |
---|---|
getgroups() | |
Up to size supplementary group IDs (of the calling process) 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. Appropriate privileges (Linux: the CAP_SETGID capability) are required. |
Tag | Description |
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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. |
Tag | Description |
---|---|
EFAULT | list has an invalid address. |
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. |
EPERM | The calling process has insufficient privilege to call setgroups(). |
long ngroups_max; ngroups_max = sysconf(_SC_NGROUPS_MAX); |
The prototype for setgroups() is only available if _BSD_SOURCE is defined.
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