I know May be I was not clear enough of what I am trying to do,
The program is as follows -
Code:
int main()
{
if( write(STDIN_FILENO,"arghh!",6) == -1 )
{
fprintf(stderr,"Error in write\n");
exit(2);
}
return 0;
}
I am doing following on shell command line -
$>file.txt (this create an empty file.txt)
$./a.out < file.txt (redirect standard input of a.out to file.txt, a.out is supposed to WRITE to(not READ from) file.txt(that is what it is programmed to do).
($ is not part of command but of shell command prompt)
STDIN_FILENO's file status flag is 2 (O_RDWR - both read write allowed).
I expected that a.out writes to standard input; which is file.txt. But file.txt remains empty.
I am trying to understand 'why'
Anybody. Please illuminate
Code:
[c_d@localhost cfiles]$ cat temp.c
#include<unistd.h>
#include<fcntl.h>
int main()
{
if((write(STDIN_FILENO,"arrgh!",6))==-1)
{
perror("error writing to file");
}
}
[c_d@localhost cfiles]$ touch file #create empty file
[c_d@localhost cfiles]$ cat file #you can see, that the file is empty
[c_d@localhost cfiles]$ gcc temp.c #compile temp.c
[c_d@localhost cfiles]$ ./a.out 0>file #redirection notice no "arrgh!" prints
[c_d@localhost cfiles]$ cat file #because "arrgh!" is redirected to file
arrgh![c_d@localhost cfiles]$ rm file ; touch file
[c_d@localhost cfiles]$ ./a.out <file # :(
error writing to file: Bad file descriptor
[c_d@localhost cfiles]$
i dunno...why that happens. probably because file connects to stdin of a.out first, so when write command executes, stdin is connected to file so it is not able to write into stdin, hence it returns -1.
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Discussion started by: wisecracker
0 Replies
LEARN ABOUT XFREE86
asadmin-reconfig
asadmin-reconfig(1AS) User Commands asadmin-reconfig(1AS)NAME
asadmin-reconfig, reconfig - applies the changes you have made for a server instance
SYNOPSIS
reconfig --user admin_user [--password admin_password] [--host localhost] [--port 4848] [--secure|-s] [--passwordfile filename] [--discard-
manualchanges=false] [--keepmanualchanges=false] instance_name
This command is deprecated. It allows you to apply changes you have made for a server instance. Use the reconfig command after you've used
the set command to change server properties. Any changes you make to the configuration files of the server do not take affect until you
apply the changes by running the reconfig command. When --discardmanualchanges is set to true, manual changes made to the server.xml file
are discarded. When --keepmanualchanges is set to true, manual changes made to the server.xml file take affect. However if both options are
false (both options are not specified), an error message is displayed if manual changes and/or changes have been applied using the Adminis-
trator Interface. Use this command with discretion since there is no undo, and the changes applied are made directly to your con-
fig/backup/server.xmlfile.
OPTIONS --user administrative user associated for the instance.
--password administrative password corresponding to the administrative user.
--host host name of the machine hosting the administrative instance.
--port administrative port number associated with the administrative host.
--passwordfile file containing passwords appropriate for the command (e.g., administrative instance).
--secure if true, uses SSL/TLS to communicate with the administrative instance.
--discardmanualchanges defaults to false. When set to true, discards the changes made manually to the server.xml file.
--keepmanualchanges defaults to false. When set to true, allows the manual changes made to the server.xml file to take affect.
OPERANDS
instance_name name of the instance..
Example 1: Using reconfig
asadmin> reconfig --user admin
--passwordfile passwords.txt --host localhost --port 4848 server1
Successfully reconfigured
Example 2: Using reconfig with the --discardmanualchanges option
asadmin> reconfig --user admin --passwordfile passwords.txt --host localhost --port 4848 --discardmanualchanges server1
Instance restart is required
Successfully reconfigured
Example 3: Using reconfig with the --keepmanualchanges option
asadmin> reconfig --user admin --passwordfile passwords.txt --host localhost --port 4848 --keepmanualchanges server1
Instance restart is required
Successfully reconfigured
EXIT STATUS
0 command executed successfully
1 error in executing the command
asadmin-get(1AS), asadmin-set(1AS), asadmin-list(1AS)J2EE 1.4 SDK March 2004 asadmin-reconfig(1AS)
04-01-2009
May be I was not clear enough of what I am trying to do,