3
votes
0answers
16 views

In ubuntu, I cannot send two-byte commands over a usb serial port from within a C program [migrated]

I wish to write in C or C++ a program to control a Sony camera connected over a USB serial device (Applied Logic USB to LANC [0600]) running on my Virtual Box guest OS, Ubuntu 12.04. Through putty, I ...
2
votes
1answer
72 views

closing the unwanted file descriptors

I am trying to understand how pipes work . This code snippet is from some website . So my understanding of the program goes like this : When we do pipe(fd) then fd[0]=3 and fd[0]=4 ( assuming only ...
0
votes
1answer
74 views

libext2fs gcc linking error

I am writing a C program which uses libext2fs: #include <ext2fs/ext2fs.h> int main(int argc, char *argv[]) { char *fsname = argv[1]; errcode_t err; ext2_filsys fs; err= ...
3
votes
1answer
175 views

How to let a user execute a script owned by root? Setuid doesn't seem to work anymore [duplicate]

I have some bash scripts that I use with the user 'root' to manage iptable rules. The problem is that I want these things at the same time: The script must be owned by root Permissions must be 700 ...
0
votes
2answers
156 views

Which process updates /proc/scsi/scsi?

I wrote C that displays info about my hardware on ubuntu. Now I wonder how I can make it more flexible such as querying the hardware directly instead of the file the os updates. So I think I can look ...
0
votes
1answer
117 views

Having trouble executing a compiled C program

I am running an Ubuntu v10.04 through VirtualBox. To test the persistence of files I create in the virtual machine, I wrote a very basic C program. When I shutdown the virtual machine and restart it, ...
1
vote
1answer
310 views

Writing a service in C: How to pass and process arguments to running service?

I want to write a service in C. While this service is running in background and processing some information I need to grab the results from this service from other applications or from command line. ...