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## Name
setresuid, setresgid - set real, effective, and saved user / group ID
## Synopsis
```**c++
#include <unistd.h>
int setresuid(uid_t, uid_t, uid_t);
int setresgid(gid_t, gid_t, gid_t);
```
## Description
Sets all of real, effective, and saved user or group ID to the given values.
An argument of `-1` keeps the corresponding ID unchanged.
For non-superusers, each of the given values has to be equal to any of the current real, effective, or saved IDs for the call to succeed.
## Return value
If the call was set successful, returns 0.
Otherwise, returns -1 and sets `errno` to describe the error.
## Errors
* `EPERM`: At least one of the passed IDs was not equal to the current real, effective, or saved ID, and the user is not superuser.
## See also
* [`setuid_overview`(7)](../man7/setuid_overview.md)
* [`geteuid`(2) / `getegid`(2)](geteuid.md)
* [`getuid`(2) / `getgid`(2)](getuid.md)
* [`getresuid`(2) / `getresgid`(2)](getresuid.md)
* [`seteuid`(2) / `setegid`(2)](seteuid.md)
* [`setuid`(2) / `setgid`(2)](setuid.md)
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