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Full Discussion: Writing from STDIN_FILENO to a file
Top Forums Programming Writing from STDIN_FILENO to a file Post 302181644 by shamrock on Thursday 3rd of April 2008 01:00:51 PM
Old 04-03-2008
Changes to the original source code are highlighted in red.

Code:
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

int main(void) {
   pid_t childpid;
   int fd[2];
   int file;
   mode_t fd_mode=S_IRWXU;

   if ((pipe(fd) == -1) || ((childpid = fork()) == -1)) {
       perror("Failed to setup pipeline");
       return 1;
   }
   if(childpid>0) {
        /* send output to the pipe */
      printf("I am parent\n");
      if (dup2(fd[1], STDOUT_FILENO) == -1) {
          perror("Failed to redirect stdout of ls");
          return 1;
      }
      else if ((close(fd[0]) == -1) || (close(fd[1]) == -1)) {
               perror("Failed to close extra pipe descriptors on ls");
               return 1;
      } else
          if (execl("/bin/ls", "ls", "-lrt", (char *) 0) < 0) {
              perror("Failed to exec output file");
              return 1;          
         }
   }
        /* receive input from the pipe */
   printf("I am child\n");
   if (dup2(fd[0], STDIN_FILENO) == -1) {
       perror("Failed to redirect stdin of writing to file");
       return 1;
   }
   else if ((close(fd[0]) == -1) || (close(fd[1]) == -1)) {
            perror("Failed to close extra pipe file descriptors");
            return 1;
   } else {
       if ((file=open("file1.txt",O_WRONLY | O_CREAT,fd_mode))==-1) {
           perror("Error opening the file");
           return 1;
       }
       char *buffer=(char *)malloc(200);
/*
 * use read() instead of fgets() as read() takes an int for the file
 * descriptor while fgets() takes a pointer to a stream of type FILE.
 * Replacing fgets() with read() doesn't crash the program anymore.
 */
       read(STDIN_FILENO, buffer, 100);
       if (write(file, buffer, 100) < 0) {
           perror("Failed to write to the pipe");
           return 1;
       }
   }
   return 0;
}

 

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LEARN ABOUT DEBIAN

colorgccrc

COLORGCCRC(5)							File Formats Manual						     COLORGCCRC(5)

NAME

       colorgccrc - configuration file for colorgcc

DESCRIPTION

       A colorgccrc configuration file is used to configure the highlighting of the compiler output from colorgcc.

SYNTAX

       Each  line  consists  of  a  keyword  designating  a configuration variable.  The keyword is followed by `:' and then one or several values
       (depending on the keyword).  Lines beginning with a hash mark `#' are comments.

CONFIGURATION VARIABLES

       g++ | gcc | c++ | cc | g77 | gcj | gnat | gpc
	      Specifies the paths to the compilers.  Takes one value; a path to the compiler.

       nocolor
	      Specifies what terminal types colorization should be disabled on.  Takes one or several values, separated by whitespace.

       srcColor
	      Specifies the highlighting attributes source-code should be given.  Takes one or several color attributes.  See  the  section  COLOR
	      ATTRIBUTES for more information.

       introColor
	      Specifies  the  highlighting  attributes	for normal compiler output.  Takes one or several color attributes.  See the section COLOR
	      ATTRIBUTES for more information.

       warningFileNameColor | errorFileNameColor
	      Specifies the highlighting attributes for the filename in a  warning  or	an  error,  respectively.   Takes  one	or  several  color
	      attributes.  See the section COLOR ATTRIBUTES for more information.

       warningNumberColor | errorNumberColor
	      Specifies  the  highlighting  attributes	for  the  line-number  in a warning or an error, respectively.	Takes one or several color
	      attributes.  See the section COLOR ATTRIBUTES for more information.

       warningMessageColor | errorMessageColor
	      Specifies the highlighting attributes for the message-text in a warning or an error,  respectively.   Takes  one	or  several  color
	      attributes.  See the section COLOR ATTRIBUTES for more information.

COLOR ATTRIBUTES

       The following attributes are valid for highlighting.

       clear, reset

       bold, underline, underscore, blink, reverse, concealed

       black, red, green, yellow, blue, magenta, cyan, white

       on_black, on_red, on_green, on_yellow, on_blue, on_magenta, on_cyan, on_white

SEE ALSO

       gcc(1), colorgcc(1)

HISTORY

       Jan 15 2003: Initial version of this manual-page.

REPORTING BUGS

       Report bugs to <jmoyers@geeks.com>

AUTHORS

       Jamie Moyers <jmoyers@geeks.com> is the author of colorgcc.

       This  manual  page  was	written  by Joe Wreschnig <piman@sacredchao.net>, and modified by David Weinehall <tao@debian.org>, for the Debian
       GNU/Linux system (but may be used by others).

COPYRIGHT

       Copyright (C) 2003 Jamie Moyers
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

								   Jan 15, 2003 						     COLORGCCRC(5)
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