03-20-2009
10 More Discussions You Might Find Interesting
1. Programming
hi, I have a problem. I've done a lil program which gets from the server the given persons username a personal folder. I made it with a pipe calling popen with a command, but how can i make the same thing using fifo. I make the fifo with mkfifo() func. and than what. How do I tell the sertver using... (3 Replies)
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2. UNIX for Dummies Questions & Answers
Hi ,
I m beginner for Unix and i want to use FIFO in my 2 Scripts . I want 1 script to read data from FIFO and other will write into FIFO.
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Hi All,
I have a query on Perl. I have a text file which has 3 lines, i want to only replace the first line with my replaced text and keep the rest of the text. FOr eg
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4. Programming
Hello,
I have a FIFO which i would like to open O_WDWR | O_NONBLOCK | O_ASYNC and have a SIGIO signal generated when there is input on the FIFO, but there a re a bunch of bugs surrounding this (like for instance i read somewhere that you have to set O_ASYNC with fcntl etc.
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5. Programming
Hello C programming fellows!!!
I'm doing a program with multiple threads in gnu/linux, ubuntu for beeing precise...
This program consist in multiple threads, as logical each thread do different things and communicate to each other using IPC.
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6. Programming
Dear friends
i'm want to implement a program which one file is split into fragments by the server (by some random size) and sent to some processes, so these processes get randomly the fragments of the original file from the server, then the downloader randomly connects to some of these processes... (0 Replies)
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7. Programming
=server.c=
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <signal.h>
#define MSGSIZE 50 (1 Reply)
Discussion started by: sponge
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8. Ubuntu
Hi!
I have installed ubuntu out of an error, a bit of frustration, a bit of annoyance and a bit of excitement! I am (was!) a windows user. I had windows 7 on my laptop. You might already know how famous windows is with nasty viruses. I got one too! Had no option but to get rid of the whole... (3 Replies)
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9. UNIX and Linux Applications
Hello ,
I am working on unix FIFO IPC. i have a doubt regarding that.
If the fifo is updated(write()) through one process....can we able to send any signal that fifo is updated and ready to get read...to other process.?? (0 Replies)
Discussion started by: Harry443
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10. Answers to Frequently Asked Questions
Hi. i am new to Linux. i have a Turbo-cad and circuit wizard programme on CD that I want to install and run. I keep getting the message I do not have an auto-run programme. Do I need to install specific drivers for this? What programme do I need? (1 Reply)
Discussion started by: Alfred Kruger
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LEARN ABOUT LINUX
setegid
SETEUID(2) Linux Programmer's Manual SETEUID(2)
NAME
seteuid, setegid - set effective user or group ID
SYNOPSIS
#include <sys/types.h>
#include <unistd.h>
int seteuid(uid_t euid);
int setegid(gid_t egid);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
seteuid(), setegid():
_BSD_SOURCE || _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600
DESCRIPTION
seteuid() sets the effective user ID of the calling process. Unprivileged user processes may only set the effective user ID to the real
user ID, the effective user ID or the saved set-user-ID.
Precisely the same holds for setegid() with "group" instead of "user".
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORS
EPERM The calling process is not privileged (Linux: does not have the CAP_SETUID capability in the case of seteuid(), or the CAP_SETGID
capability in the case of setegid()) and euid (respectively, egid) is not the real user (group) ID, the effective user (group) ID,
or the saved set-user-ID (saved set-group-ID).
CONFORMING TO
4.3BSD, POSIX.1-2001.
NOTES
Setting the effective user (group) ID to the saved set-user-ID (saved set-group-ID) is possible since Linux 1.1.37 (1.1.38). On an arbi-
trary system one should check _POSIX_SAVED_IDS.
Under libc4, libc5 and glibc 2.0 seteuid(euid) is equivalent to setreuid(-1, euid) and hence may change the saved set-user-ID. Under glibc
2.1 and later it is equivalent to setresuid(-1, euid, -1) and hence does not change the saved set-user-ID. Similar remarks hold for sete-
gid().
According to POSIX.1, seteuid() (setegid()) need not permit euid (egid) to be the same value as the current effective user (group) ID, and
some implementations do not permit this.
SEE ALSO
geteuid(2), setresuid(2), setreuid(2), setuid(2), capabilities(7), credentials(7)
COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2009-10-17 SETEUID(2)