SETGROUPS(2) | System Calls Manual | SETGROUPS(2)

# NAME

`setgroups` — set group access list

# SYNOPSIS

`#include <sys/types.h>`
`#include <unistd.h>`

int
`setgroups`(int ngroups, const gid_t *gidset);

# DESCRIPTION

`setgroups`() sets the group access list of the current user process according to the array gidset. The parameter ngroups indicates the number of entries in the array and must be no more than `NGROUPS_MAX`.

Only the superuser may set new groups.

# RETURN VALUES

Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error.

# ERRORS

The `setgroups`() call will fail if:

[`EINVAL`]
  The value of ngroups is greater than `NGROUPS_MAX`.
[`EPERM`]
  The caller is not the superuser.
[`EFAULT`]
  The address specified for gidset is outside the process address space.

# SEE ALSO

getgroups(2), setgid(2), setregid(2), initgroups(3)

# HISTORY

The `setgroups`() system call first appeared in 4.1cBSD.

July 8, 2019 | Debian