Real, effective and saved user id in C program

Login or Register for Dates, Times and to Reply

Thread Tools Search this Thread
# 1  
Real, effective and saved user id in C program

I figured it out by now.

Last edited by Ralph; 04-02-2019 at 03:26 AM..
Login or Register for Dates, Times and to Reply

Previous Thread | Next Thread
Thread Tools Search this Thread
Search this Thread:
Advanced Search

Test Your Knowledge in Computers #443
Difficulty: Easy
FHM, a men's lifestyle magazine, asked 1,344 women if they preferred to hang out with a computer science expert or a footballer, and 1,023 (76.116%) stated they preferred geeks over athletes.
True or False?

8 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

Regarding real example of user of semicolon(;) and + in find/exec command.

Hello All, Was recently working on an requirement where we have to search files more than a specific number, following is the example on same. Let's say file names are test_40000.txt,test_40001.txt and so on till test_99999.txt. Now requirement was to search from find command only those... (1 Reply)
Discussion started by: RavinderSingh13
1 Replies

2. UNIX for Dummies Questions & Answers

[Solved] effective user id upon exec

Hello all. Despite the exec man page, the exec system call seems to turn my effective-user-id into my real-user-id. I coded and compiled 2 very simple c programs as user 1 (uid=501) The first one (A) prints real and effective user IDs and then execs the second one (B), which in turn prints... (7 Replies)
Discussion started by: oviv
7 Replies

3. UNIX for Dummies Questions & Answers

Real and Effective IDs

Can anyone explain me in details of Real and Effective IDs (6 Replies)
Discussion started by: kkalyan
6 Replies

4. Solaris

Help with who am i . Not displaying real user

Hi I'm trying to get the real username of any user running as root on my server. On one of my server running Sol 10, if I su to root and run who am i, it displays my username. which is what I want. But when I run it on another server, this time on Sol 8, it displays root as the user. Is... (9 Replies)
Discussion started by: wisdom
9 Replies

5. Shell Programming and Scripting

In real time - what user connects or disconnect

Write a tool that will be displayed in real time, what user connects or disconnects from a system that uses this tool :)) Maybe anyone can help me? (2 Replies)
Discussion started by: titasas
2 Replies

6. Shell Programming and Scripting

how to get real user name

I know that in order to get a real user name I should use the following command: cut -d: -f5 /etc/passwd. But how can I get the real user name for those users who are currently logged in to the system??? :confused: Can somebody help me??? (3 Replies)
Discussion started by: aga
3 Replies

7. Post Here to Contact Site Administrators and Moderators

I'm need effective program for advertising internet-projects

Anybody can recomend me websites for purchase professional software for website advertising? It's really important to me. Please, help. Thanks P.S. Also I need for advertising soft that can break CAPTHA's, can mass posting, can sort sites by Google PageRank (PR) and others. Also, I'm interested... (1 Reply)
Discussion started by: WebPromoters
1 Replies

8. Cybersecurity

Changing effective user

I would like to give execution rights for a script to one user. (that's the easy part...) When that user is running the script, I would like the effective user ID to be that of the file-owner. Is this possible? (6 Replies)
Discussion started by: hilmel
6 Replies
SETREUID(2)						      BSD System Calls Manual						       SETREUID(2)

setreuid -- set real and effective user ID's LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <unistd.h> int setreuid(uid_t ruid, uid_t euid); DESCRIPTION
This interface is made obsolete by the saved ID functionality in setuid(2) and seteuid(2). The real and effective user ID's of the current process are set according to the arguments. If the real user ID is changed, the saved user ID is changed to the new value of the effective user ID. If ruid or euid is -1, the current uid is filled in by the system. Unprivileged users may change the real user ID to the effective user ID, and may change the effective user ID to the real user ID or the saved user ID; only the super-user may make other changes. The setreuid() function has been used to swap the real and effective user IDs in set-user-ID programs to temporarily relinquish the set-user- ID value. This purpose is now better served by the use of the seteuid() function (see setuid(2)). When setting the real and effective user IDs to the same value, this function is equivalent to the setuid() function. When setting only the effective user ID, this function is equivalent to the seteuid() function. RETURN VALUES
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error. ERRORS
[EPERM] The current process is not the super-user and a change other than changing the effective user-id to the real user-id was specified. SEE ALSO
getuid(2), seteuid(2), setgid(2), setuid(2) HISTORY
The setreuid() function call appeared in 4.2BSD. An incompatible version was implemented in 4.4BSD. It was reimplemented in NetBSD 1.2 in a way compatible with 4.3BSD, SunOS and Linux, but should not be used in new code. BSD
January 5, 2001 BSD

Featured Tech Videos