seteuid - set effective user ID
int seteuid(uid_t uid);
If uid is equal to the real user ID or the saved set-user-ID, or if the process has appropriate privileges, seteuid() shall set the effective user ID of the calling process to uid; the real user ID and saved set-user-ID shall remain unchanged.
The seteuid() function shall not affect the supplementary group list in any way.
Upon successful completion, 0 shall be returned; otherwise, -1 shall be returned and errno set to indicate the error.
The seteuid() function shall fail if:
- The value of the uid argument is invalid and is not supported by the implementation.
- The process does not have appropriate privileges and uid does not match the real user ID or the saved set-user-ID.
Refer to the RATIONALE section in setuid().
exec(), getegid(), geteuid(), getgid(), getuid(), setegid(), setgid(), setregid(), setreuid(), setuid(), the Base Definitions volume of IEEE Std 1003.1-2001, <sys/types.h>, <unistd.h>
First released in Issue 6. Derived from the IEEE P1003.1a draft standard.
IEEE Std 1003.1-2001/Cor 2-2004, item XSH/TC2/D6/123 is applied, making an editorial correction to the [EPERM] error in the ERRORS section.