open() function with denied permission
I am trying to create a 'test.txt' file in root directory. Currently I am not a root user. my code is as follows:
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
int main(){
int fd;
fd=open("/test.txt",O_CREAT|O_RDWR|O_TRUNC,0777);
perror("error: ");
close(fd);
return 0;
}
however, when I compile and execute it, I get the error:
error: : Permission denied
how can I make my code to have the permission to create a file in root directory?
P.S. I am trying to make this work so that I can use it later on to apply this method to my linux daemon program.
c
edited Nov 28 '18 at 6:23
Community♦
11
asked Sep 6 '14 at 13:55
kwagjjkwagjj
281317
add a comment |
I am trying to create a 'test.txt' file in root directory. Currently I am not a root user. my code is as follows:
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
int main(){
int fd;
fd=open("/test.txt",O_CREAT|O_RDWR|O_TRUNC,0777);
perror("error: ");
close(fd);
return 0;
}
however, when I compile and execute it, I get the error:
error: : Permission denied
how can I make my code to have the permission to create a file in root directory?
P.S. I am trying to make this work so that I can use it later on to apply this method to my linux daemon program.
c
edited Nov 28 '18 at 6:23
Community♦
11
asked Sep 6 '14 at 13:55
kwagjjkwagjj
281317
11
Your program has to be run as a user which have permission to write in the asked directory. I suggest you rethink where to place your daemon files, have a separate folder (in e.g./var/libor similar) owned by a special user created just for your daemon. That way you don't have to run the daemon asrootand sidestep a big security risk.
– Some programmer dude
Sep 6 '14 at 14:01
you should run your program as a admin/root
– µtex
Sep 6 '14 at 14:05
1
@user1234 no, not really.
– The Paramagnetic Croissant
Sep 6 '14 at 15:08
@JoachimPileborg thanks I think you're right
– kwagjj
Sep 6 '14 at 18:12
add a comment |
I am trying to create a 'test.txt' file in root directory. Currently I am not a root user. my code is as follows:
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
int main(){
int fd;
fd=open("/test.txt",O_CREAT|O_RDWR|O_TRUNC,0777);
perror("error: ");
close(fd);
return 0;
}
however, when I compile and execute it, I get the error:
error: : Permission denied
how can I make my code to have the permission to create a file in root directory?
P.S. I am trying to make this work so that I can use it later on to apply this method to my linux daemon program.
c
edited Nov 28 '18 at 6:23
Community♦
11
asked Sep 6 '14 at 13:55
kwagjjkwagjj
281317
I am trying to create a 'test.txt' file in root directory. Currently I am not a root user. my code is as follows:
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
int main(){
int fd;
fd=open("/test.txt",O_CREAT|O_RDWR|O_TRUNC,0777);
perror("error: ");
close(fd);
return 0;
}
however, when I compile and execute it, I get the error:
error: : Permission denied
how can I make my code to have the permission to create a file in root directory?
P.S. I am trying to make this work so that I can use it later on to apply this method to my linux daemon program.
c
c
edited Nov 28 '18 at 6:23
Community♦
11
asked Sep 6 '14 at 13:55
kwagjjkwagjj
281317
edited Nov 28 '18 at 6:23
Community♦
11
asked Sep 6 '14 at 13:55
kwagjjkwagjj
281317
edited Nov 28 '18 at 6:23
Community♦
11
edited Nov 28 '18 at 6:23
Community♦
11
edited Nov 28 '18 at 6:23
Community♦
11
11
asked Sep 6 '14 at 13:55
kwagjjkwagjj
281317
asked Sep 6 '14 at 13:55
kwagjjkwagjj
281317
asked Sep 6 '14 at 13:55
kwagjjkwagjj
281317
281317
11
Your program has to be run as a user which have permission to write in the asked directory. I suggest you rethink where to place your daemon files, have a separate folder (in e.g./var/libor similar) owned by a special user created just for your daemon. That way you don't have to run the daemon asrootand sidestep a big security risk.
– Some programmer dude
Sep 6 '14 at 14:01
you should run your program as a admin/root
– µtex
Sep 6 '14 at 14:05
1
@user1234 no, not really.
– The Paramagnetic Croissant
Sep 6 '14 at 15:08
@JoachimPileborg thanks I think you're right
– kwagjj
Sep 6 '14 at 18:12
add a comment |
11
Your program has to be run as a user which have permission to write in the asked directory. I suggest you rethink where to place your daemon files, have a separate folder (in e.g./var/libor similar) owned by a special user created just for your daemon. That way you don't have to run the daemon asrootand sidestep a big security risk.
– Some programmer dude
Sep 6 '14 at 14:01
you should run your program as a admin/root
– µtex
Sep 6 '14 at 14:05
1
@user1234 no, not really.
– The Paramagnetic Croissant
Sep 6 '14 at 15:08
@JoachimPileborg thanks I think you're right
– kwagjj
Sep 6 '14 at 18:12
11
11
Your program has to be run as a user which have permission to write in the asked directory. I suggest you rethink where to place your daemon files, have a separate folder (in e.g.
/var/lib or similar) owned by a special user created just for your daemon. That way you don't have to run the daemon as root and sidestep a big security risk.– Some programmer dude
Sep 6 '14 at 14:01
Your program has to be run as a user which have permission to write in the asked directory. I suggest you rethink where to place your daemon files, have a separate folder (in e.g.
/var/lib or similar) owned by a special user created just for your daemon. That way you don't have to run the daemon as root and sidestep a big security risk.– Some programmer dude
Sep 6 '14 at 14:01
you should run your program as a admin/root
– µtex
Sep 6 '14 at 14:05
you should run your program as a admin/root
– µtex
Sep 6 '14 at 14:05
1
1
@user1234 no, not really.
– The Paramagnetic Croissant
Sep 6 '14 at 15:08
@user1234 no, not really.
– The Paramagnetic Croissant
Sep 6 '14 at 15:08
@JoachimPileborg thanks I think you're right
– kwagjj
Sep 6 '14 at 18:12
@JoachimPileborg thanks I think you're right
– kwagjj
Sep 6 '14 at 18:12
add a comment |
1 Answer
1
active
oldest
votes
fd=open("/test.txt",O_CREAT|O_RDWR|O_TRUNC,0777);
In this line specify path correctly.(i.e) It is current working directory means, keep (dot) . before / like./test.txt
answered Sep 6 '14 at 18:00
Anbu.SankarAnbu.Sankar
1,153515
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f25701020%2fopen-function-with-denied-permission%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
fd=open("/test.txt",O_CREAT|O_RDWR|O_TRUNC,0777);
In this line specify path correctly.(i.e) It is current working directory means, keep (dot) . before / like./test.txt
answered Sep 6 '14 at 18:00
Anbu.SankarAnbu.Sankar
1,153515
add a comment |
fd=open("/test.txt",O_CREAT|O_RDWR|O_TRUNC,0777);
In this line specify path correctly.(i.e) It is current working directory means, keep (dot) . before / like./test.txt
answered Sep 6 '14 at 18:00
Anbu.SankarAnbu.Sankar
1,153515
add a comment |
fd=open("/test.txt",O_CREAT|O_RDWR|O_TRUNC,0777);
In this line specify path correctly.(i.e) It is current working directory means, keep (dot) . before / like./test.txt
answered Sep 6 '14 at 18:00
Anbu.SankarAnbu.Sankar
1,153515
fd=open("/test.txt",O_CREAT|O_RDWR|O_TRUNC,0777);
In this line specify path correctly.(i.e) It is current working directory means, keep (dot) . before / like./test.txt
answered Sep 6 '14 at 18:00
Anbu.SankarAnbu.Sankar
1,153515
answered Sep 6 '14 at 18:00
Anbu.SankarAnbu.Sankar
1,153515
answered Sep 6 '14 at 18:00
Anbu.SankarAnbu.Sankar
1,153515
answered Sep 6 '14 at 18:00
Anbu.SankarAnbu.Sankar
1,153515
1,153515
add a comment |
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f25701020%2fopen-function-with-denied-permission%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
11
Your program has to be run as a user which have permission to write in the asked directory. I suggest you rethink where to place your daemon files, have a separate folder (in e.g.
/var/libor similar) owned by a special user created just for your daemon. That way you don't have to run the daemon asrootand sidestep a big security risk.– Some programmer dude
Sep 6 '14 at 14:01
you should run your program as a admin/root
– µtex
Sep 6 '14 at 14:05
1
@user1234 no, not really.
– The Paramagnetic Croissant
Sep 6 '14 at 15:08
@JoachimPileborg thanks I think you're right
– kwagjj
Sep 6 '14 at 18:12