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Top Forums Programming Need help with running the tar command using system() call in C Post 302256501 by wempy on Monday 10th of November 2008 02:00:59 AM
Old 11-10-2008
chroot is not what you want, it changes the / path to be the named dir, so any subsequent calls will have that as their / path - not a good idea

chdir() is what you need
man 2 chdir will give you information on chdir (on a linux machine anyway)
 

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chdir(2)							   System Calls 							  chdir(2)

NAME
chdir, fchdir - change working directory SYNOPSIS
#include <unistd.h> int chdir(const char *path); int fchdir(int fildes); DESCRIPTION
The chdir() and fchdir() functions cause a directory pointed to by path or fildes to become the current working directory. The starting point for path searches for path names not beginning with / (slash). The path argument points to the path name of a directory. The fildes argument is an open file descriptor of a directory. For a directory to become the current directory, a process must have execute (search) access to the directory. RETURN VALUES
Upon successful completion, 0 is returned. Otherwise, -1 is returned, the current working directory is unchanged, and errno is set to indi- cate the error. ERRORS
The chdir() function will fail if: EACCES Search permission is denied for any component of the path name. EFAULT The path argument points to an illegal address. EINTR A signal was caught during the execution of the chdir() function. EIO An I/O error occurred while reading from or writing to the file system. ELOOP Too many symbolic links were encountered in translating path. ENAMETOOLONG The length of the path argument exceeds PATH_MAX, or the length of a path component exceeds NAME_MAX while _POSIX_NO_TRUNC is in effect. ENOENT Either a component of the path prefix or the directory named by path does not exist or is a null pathname. ENOLINK The path argument points to a remote machine and the link to that machine is no longer active. ENOTDIR A component of the path name is not a directory. The fchdir() function will fail if: EACCES Search permission is denied for fildes. EBADF The fildes argument is not an open file descriptor. EINTR A signal was caught during the execution of the fchdir() function. EIO An I/O error occurred while reading from or writing to the file system. ENOLINK The fildes argument points to a remote machine and the link to that machine is no longer active. ENOTDIR The open file descriptor fildes does not refer to a directory. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Async-Signal-Safe | +-----------------------------+-----------------------------+ SEE ALSO
chroot(2), attributes(5), standards(5) SunOS 5.10 28 Dec 1996 chdir(2)
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