Sponsored Content
Full Discussion: question about popen in C
Top Forums Programming question about popen in C Post 302505010 by omega666 on Wednesday 16th of March 2011 01:06:43 AM
Old 03-16-2011
so if i set an element of a file_pointer array to 0, and then i compare NULL to that value 0, will it crash or just result to false, cause i set the file pointer array and pid array to 0, after closing its respective file pointer. this is like removing the struct from the chain of structs, but using an array method.

also
for the popen_new function
the instruction given was ls; ls

Last edited by omega666; 03-17-2011 at 05:15 PM..
 

10 More Discussions You Might Find Interesting

1. Programming

question about popen();

Hi The following is my program to test popen() routine. The purpose is to print some contents of the corrent directory. But in fact, the output is only one character 'a', which I believe is the first char of the file "a.out". So, can anybody tell me what is wrong about this program?... (2 Replies)
Discussion started by: dell9
2 Replies

2. Programming

query in popen

hai friends I have written a tcp chat server in c.. I have designed a cgi program in c to control it... When i try to start the server from the cgi program, it is not starting. Why is that ? I have even tried giving the root ownership for all the programs.. Still its not. I have used the... (1 Reply)
Discussion started by: collins
1 Replies

3. Programming

popen and tar, please HELP!

Hi there, I'm facing a problem running the tar command with the popen function. FILE* fp = popen("tar czf - textfile","r") // output this program should give the output to the stdout. I don't know if it is possible and which function like fprint() etc. should I use. I suppose that I... (4 Replies)
Discussion started by: stef83
4 Replies

4. Programming

using popen with background process

hi, how to work with a background process without a controlling terminal to make use of popen or system call ? when ever i use popen or system function call in foreground process, there is no problem with respect to that .. but when the same program is run as a background process without a... (7 Replies)
Discussion started by: matrixmadhan
7 Replies

5. Shell Programming and Scripting

Python: popen problems

Hello I'm writing a web server in python(obelisk-http.sourceforge.net) and I'm having a greeat problem with POST method it like that When someone make a POST request to the server it must open the executable(perl/python/.exe/elf) and send to the STANDART in (stdin) the request and get the... (2 Replies)
Discussion started by: sendai
2 Replies

6. Programming

prolems with pipes and popen in c

Hi! I'm trying to write a c program. The child process must transmit to the parent a file name and the parent must count the lines from the file and return te result to the child. Here is what i've done. It doesn't stop running, I guess. I'm sorry if it's an ugly code, i'm new at this stuff,... (2 Replies)
Discussion started by: alina89
2 Replies

7. UNIX for Advanced & Expert Users

popen and pclose solved

Hi I am trying to use popen function with wrtie option to give inputs to ftp command. #include "stdio.h" int main(int argv ,char *argc) { int size=0; char *buf; FILE *fp; fp = popen("ftp","w"); while(getline(&buf,&size,stdin) != -1) write(fp,buf);... (0 Replies)
Discussion started by: kumaran_5555
0 Replies

8. Programming

segmentation fault while using popen

hi, i am trying to use popen to run a grep process and check if the pattern exists in the file that i am searching in. i am getting segmentation fault when i try to execute the following code char *cd; char flag; char hdr_flpsp; char hdr_flpsp2; FILE *fp; printf ("program starts");... (1 Reply)
Discussion started by: sais
1 Replies

9. Programming

question about system and popen in C

in man system it talks about SIGCHLD will be blocked, and SIGINT and SIGQUIT will be ignored. Does this signal stuff also happen in popen command? (even though man popen says nothing about signals) also if I am not using wait(&status) and I am using waitpid(pid, NULL, 0) how would... (1 Reply)
Discussion started by: omega666
1 Replies

10. Programming

Popen problem

Hello all, I am reading a huge zip file in POPEN process and then writting that to a normal file which of 2GB. Now the process is failing when I looked for the cause someother process comming in after I read my file and it is deleting the zip. But in theory the popen command should read the... (5 Replies)
Discussion started by: arunkumar_mca
5 Replies
ARRAY_DIFF(3)								 1							     ARRAY_DIFF(3)

array_diff - Computes the difference of arrays

SYNOPSIS
array array_diff (array $array1, array $array2, [array $...]) DESCRIPTION
Compares $array1 against one or more other arrays and returns the values in $array1 that are not present in any of the other arrays. PARAMETERS
o $array1 - The array to compare from o $array2 - An array to compare against o $... - More arrays to compare against RETURN VALUES
Returns an array containing all the entries from $array1 that are not present in any of the other arrays. EXAMPLES
Example #1 array_diff(3) example <?php $array1 = array("a" => "green", "red", "blue", "red"); $array2 = array("b" => "green", "yellow", "red"); $result = array_diff($array1, $array2); print_r($result); ?> Multiple occurrences in $array1 are all treated the same way. This will output : Array ( [1] => blue ) NOTES
Note Two elements are considered equal if and only if (string) $elem1 === (string) $elem2. In words: when the string representation is the same. Note This function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using array_diff($array1[0], $array2[0]);. SEE ALSO
array_diff_assoc(3), array_intersect(3), array_intersect_assoc(3). PHP Documentation Group ARRAY_DIFF(3)
All times are GMT -4. The time now is 01:34 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy