Can't run program after compilation with gcc

Question

So, i am trying to run a program i wrote in C, in my Samsung Galaxy Tab 2 (in a virtual machine)

it compiles without a problem, the make command runs smoothly but the program itself doesn't run

shell$ ./prot

This gives me the following error:

bash: ./prot: Permission Denied

These are the permissions on the file:

-rw-rw-r-- 1 root sdcard-rw 8609 Mar 20 16:23 prot

What could this be, and how can i overcome this little problem?

PS.: I'm using Ubuntu, this program compiles and runs well on my Mac.

EDIT: See the answer of teppic, it solved my problem.

Yeah, looks like you dont have X permission for anyone to execute — FELIPE_RIBAS
– FELIPE_RIBAS, Commented Mar 20, 2013 at 16:36

teppic · Accepted Answer · 2013-03-20 16:50:05Z

3

It's very likely that your sdcard is mounted with noexec, which prevents you from executing any files on it. If you look in /etc/fstab, and there's an entry for the sdcard, take out this option. It's also normally possible to remount with the exec option with mount -o remount,exec.

Otherwise, you may be able to copy it somewhere where executables are allowed (e.g. /tmp).

answered Mar 20, 2013 at 16:50

teppic

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1 Comment

Souza Over a year ago

And you were right! Thank you very much to you and the others that tried to help me!

user529758 · Accepted Answer · 2013-03-20 16:31:53Z

1

You have to have permission for execution, i. e. the x bit set. Try

chmod +x prot

to fix it.

answered Mar 20, 2013 at 16:31

user529758

4 Comments

Souza Over a year ago

Tried that, the permissions didn't change, still the same error. Tried that command and also with sudo before it. Nothing.

user529758 Over a year ago

@Souza Then you're missing something else. Are you sure you're chmodding the same file you're trying to run?

John U Over a year ago

I think you need to chown and then chmod. I've also had chmod refuse the +x parameter but accept numerical ones like 777 on some systems.

Souza Over a year ago

seems the problem was that i didn't have the rights to change permissions at all inside the SD card, remounted with exec and it works now!

FELIPE_RIBAS · Accepted Answer · 2013-03-20 16:37:46Z

0

Maybe you need admin permission to change it, try:

$> sudo chmod 777 prot

answered Mar 20, 2013 at 16:37

FELIPE_RIBAS

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