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Add man pages for seteuid() and friends.

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Also add an overview page that explains the general concepts.
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Nico Weber 2020-06-30 15:32:10 -04:00 • committed by Andreas Kling
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38
Base/usr/share/man/man2/seteuid.md Normal file
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## Name
seteuid, setegid - set effective user / group ID
## Synopsis
```**c++
#include <unistd.h>
int seteuid(uid_t);
int setegid(gid_t);
```
## Description
Sets the effective user or group ID.
For non-superusers, the effective ID can only be set to the current real or saved ID.
In particular, `seteuid(geteuid())` will fail if the current effective user ID is not equal to the current real or saved ID.
## Return value
If the call was set successful, returns 0.
Else, returns -1 and sets `errno` to describe the error.
## Errors
* `EPERM`: The new ID is not equal to the real ID 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)
* [`setuid`(2) / `setgid`(2)](setuid.md)
* [`setresuid`(2) / `setresgid`(2)](setresuid.md)