tar_extract_file(3) C Library Calls tar_extract_file(3)NAME
tar_extract_file, tar_extract_regfile, tar_extract_hardlink,
tar_extract_symlink, tar_extract_chardev, tar_extract_blockdev,
tar_extract_dir, tar_extract_fifo, tar_skip_regfile, tar_set_file_perms
- extract files from a tar archive
SYNOPSIS
#include <libtar.h>
int tar_extract_file(TAR *t, char *realname);
int tar_extract_regfile(TAR *t, char *realname);
int tar_skip_regfile(TAR *t);
int tar_extract_dir(TAR *t, char *realname);
int tar_extract_hardlink(TAR *t, char *realname);
int tar_extract_symlink(TAR *t, char *realname);
int tar_extract_blockdev(TAR *t, char *realname);
int tar_extract_chardev(TAR *t, char *realname);
int tar_extract_fifo(TAR *t, char *realname);
int tar_set_file_perms(TAR *t, char *realname);
VERSION
This man page documents version 1.2 of libtar.
DESCRIPTION
The tar_extract_file() function acts as a front-end to the other
tar_extract_*() functions. It checks the current tar header associated
with the TAR handle t (which must be initialized first by calling
th_read()) to determine what kind of file the header refers to. It
then calls the appropriate tar_extract_*() function to extract that
kind of file.
The tar_skip_regfile() function skips over the file content blocks and
positions the file pointer at the expected location of the next tar
header block.
The tar_set_file_perms() function sets the attributes of the extracted
file to match the encoded values. This includes the file's modifica‐
tion time, mode, owner, and group. This function is automatically
called by tar_extract_file(), but applications which call the other
tar_extract_*() functions directly will need to call
tar_set_file_perms() manually if this behavior is desired.
RETURN VALUES
On successful completion, the functions documented here will return 0.
On failure, they will return -1 and set errno to an appropriate value.
The tar_extract_dir() function will return 1 if the directory already
exists.
ERRORS
The tar_extract_file() function will fail if:
EEXIST If the O_NOOVERWRITE flag is set and the file already exists.
The tar_extract_*() functions will fail if:
EINVAL An entry could not be added to the internal file hash.
EINVAL Less than T_BLOCKSIZE bytes were read from the tar archive.
EINVAL The current file header associated with t refers to a kind of
file other than the one which the called function knows about.
They may also fail if any of the following functions fail: mkdir(),
write(), link(), symlink(), mknod(), mkfifo(), utime(), chown(),
lchown(), chmod(), or lstat().
SEE ALSOmkdir(2), write(2), link(2), symlink(2), mknod(2), mkfifo(2), utime(2),
chown(2), lchown(2), chmod(2), lstat(2)University of Illinois Jan 2001 tar_extract_file(3)
