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Full Discussion: tar and fifos
Top Forums UNIX for Advanced & Expert Users tar and fifos Post 302086134 by blowtorch on Tuesday 22nd of August 2006 10:48:20 AM
Old 08-22-2006
Well, see, there you have a problem. Cause tar needs filenames. Atleast the Solaris tar barfed saying something like that... If you just want to write to an output file, why not use dd?
--EDIT
Just tried tar on Linux and it failed too. Here's the simulation that I am using. It may not be anywhere near what you have, but its the closest that I'm gonna get.
Code:
#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<errno.h>

int main() {

        int fd,i;
        char a[2];

        fd=open("/tmp/pipe",O_WRONLY);
        if(fd==-1) {
                fprintf(stderr,"Error opening pipe: %d",errno);
                exit(-1);
        }
        for(i=65;i<91;i++) {
                sprintf(a,"%c",i);
                write(fd,&a[0],sizeof(char));
        }
        close(fd);
}

And here's how I am using dd:
Code:
$ ./a.out &
[1] 5795
$ dd if=/tmp/pipe bs=1
ABCDEFGHIJKLMNOPQRSTUVWXYZ26+0 records in
26+0 records out
26 bytes (26 B) copied, 0.000537 seconds, 48.4 kB/s
[1]+  Done                    ./a.out

Cheers
Last edited by blowtorch; 08-22-2006 at 12:03 PM..
 

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LEARN ABOUT CENTOS

tar_append_file

tar_append_file(3)						  C Library Calls						tar_append_file(3)

NAME

       tar_append_file, tar_append_eof, tar_append_regfile - append data to tar archives

SYNOPSIS

       #include <libtar.h>

       int tar_append_file(TAR *t, char *realname, char *savename);

       int tar_append_regfile(TAR *t, char *realname);

       int tar_append_eof(TAR *t);

VERSION

       This man page documents version 1.2 of libtar.

DESCRIPTION

       The  tar_append_file()  function  creates  a tar file header block describing the file named by the realname argument, but with the encoded
       filename of savename.  It then sets the current header associated with the TAR handle t to the newly created header block, and writes  this
       block  to  the  tar  archive  associated  with  t.   If	the  file named by realname is a regular file (and is not encoded as a hard link),
       tar_append_file() will call tar_append_regfile() to append the contents of the file.

       The tar_append_regfile() function appends the contents of a regular file to the tar archive associated with  t.	 Since	this  function	is
       called by tar_append_file(), it should only be necessary for applications that construct and write the tar file header on their own.

       The tar_append_eof() function writes an EOF marker (two blocks of all zeros) to the tar file associated with t.

RETURN VALUES

       On successful completion, these functions will return 0.  On failure, they will return -1 and set errno to an appropriate value.

ERRORS

       The tar_append_*() functions will fail if:

       EINVAL Less than T_BLOCKSIZE bytes were written to the tar archive.

       EINVAL Less than T_BLOCKSIZE bytes were read from the realname file.

       They  may  also	fail  if any of the following functions fail: lstat(), malloc(), open(), read(), th_write(), or the write function for the
       file type associated with the TAR handle t.

SEE ALSO

       read(2), open(2), lstat(2), th_write(3)

University of Illinois						     Jan 2001							tar_append_file(3)
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