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chroot.0
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1996-09-01
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CHROOT(2) UNIX Programmer's Manual CHROOT(2)
NNAAMMEE
cchhrroooott - change root directory
SSYYNNOOPPSSIISS
##iinncclluuddee <<uunniissttdd..hh>>
_i_n_t
cchhrroooott(_c_o_n_s_t _c_h_a_r _*_d_i_r_n_a_m_e)
DDEESSCCRRIIPPTTIIOONN
_D_i_r_n_a_m_e is the address of the pathname of a directory, terminated by an
ASCII NUL. CChhrroooott() causes _d_i_r_n_a_m_e to become the root directory, that
is, the starting point for path searches of pathnames beginning with `/'.
In order for a directory to become the root directory a process must have
execute (search) access for that directory.
It should be noted that cchhrroooott() has no effect on the process's current
directory.
This call is restricted to the super-user.
RREETTUURRNN VVAALLUUEESS
Upon successful completion, a value of 0 is returned. Otherwise, a value
of -1 is returned and _e_r_r_n_o is set to indicate an error.
EERRRROORRSS
CChhrroooott() will fail and the root directory will be unchanged if:
[ENOTDIR] A component of the path name is not a directory.
[ENAMETOOLONG]
A component of a pathname exceeded {NAME_MAX} characters,
or an entire path name exceeded {PATH_MAX} characters.
[ENOENT] The named directory does not exist.
[EACCES] Search permission is denied for any component of the path
name.
[ELOOP] Too many symbolic links were encountered in translating the
pathname.
[EFAULT] _P_a_t_h points outside the process's allocated address space.
[EIO] An I/O error occurred while reading from or writing to the
file system.
SSEEEE AALLSSOO
chdir(2)
HHIISSTTOORRYY
The cchhrroooott() function call appeared in 4.2BSD.
4.2 Berkeley Distribution June 4, 1993 1