A question about the system call mount in a C program
Dear all,
Currently I'm working on a C program (OS = ubuntu 9.0.4)in which a USB key will
be mounted and umounted for several times. I read the man page
of the mount system call.
I use the following test code
Code:
#include <sys/mount.h>
int main(int argc, char *argv[])
{
if (mount("/dev/sdg1", "/media/flashCorsaire/", "fuseblk",
MS_MGC_VAL,"rw,nosuid,nodev,allow_other,blksize=4096") != 0)
{
fprintf(stderr, "Error: The program doesn't seem to be able ");
fprintf(stderr, "to control the USB device\n");
fprintf(stderr, "%s\n", strerror(errno));
return 1;
}
return 0;
}
Whether the USB key has already been mounted or not, when I run this program as root I get
the following error message:
Code:
Error: The program doesn't seem to be able to control the USB device
Invalid argument
I don't really understand what is invalid argument in my code, because here is the line that I put
in /etc/fstab:
Code:
/dev/sdg1 /media/flashCorsaire auto defaults 0 0
And also here is what I see in /etc/mtab when I connect the USB to my PC
Therefore the file system is 'fuseblk' and options are rw,nosuid,nodev,allow_other,blksize=4096
So what's the problem? Where did I make a mistake in the code that generates this error
message?
Hi,
Ho do I differentiate system call from library call?
for example if I am using chmod , how do I find out if it is a system call or library call?
Thanks
Muru (2 Replies)
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LEARN ABOUT SUSE
halmount
halmount(1) User Commands halmount(1)NAME
halmount - mount and umount filesystems via hal
SYNOPSIS
halmount [OPTIONS]... <device|label> [mountpoint]
halmount -u [OPTIONS]... <device|label|mountpoint>
halmount -e [OPTIONS]... <device|label|mountpoint>
DESCRIPTION
halmount can mount and umount filesystems via hal. Hotpluggable devices and media such as USB sticks and CD-ROMs are typically not entered
into /etc/fstab and are therefore not mountable by normal users via the mount(8) command. Instead hal provides methods to mount and umount
such devices.
Additionally it's also possible to eject devices. For devices like USB sticks eject means the device cannot be mounted again until the
stick is re-plugged, ie a "save remove" feature.
OPTIONS -t TYPE
specify the file system type to use
-o OPTIONS
specify mount options
-v verbose listing of devices
-u umount specified device
-e umount and eject specified device
-a perform requested mount/umount/eject operation all available devices
--listudi
list UDIs of devices, useful for debugging
EXAMPLES
halmount
list all mountable devices known to hal
halmount /dev/hdc
mount device hdc on default mount point (/media/volumelabel)
halmount /dev/hdc cdrom
mount device hdc on /media/cdrom
halmount -u "Holiday Pictures"
umount device that has the label "Holiday Pictures"
SEE ALSO mount(8), umount(8), eject(1), fstab(5)SUSE Linux November 2006 halmount(1)
08-16-2009
A question about the system call mount in a C program
