Login or Register to Ask a Question and Join Our Community


Programming

How to get fdes from FILE*

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Programming How to get fdes from FILE*
# 1  
Old 06-02-2005
Question How to get fdes from FILE*
The open() system call directly returns a fdes, whereas it's more portable 'ANSI C' counterpart fopen() returns a pointer the the FILE struct.

I have seen implementation of stdio.h on HP-UX, BSD and a few more, the typedef'd struct FILE stores the value of file descriptor in differenrt ways with diff attribute names.

In such a case how do i portably extract the file descriptor from a pointer to the FILE struct as returned by fopen?

Is there any such macro in C?

Even as i am concerned about portability I also need to excercise the power and granularity provided by system calls Smilie

F1, F1, F1 ......

Thanks in Advance,
Sumanth
# 2  
Old 06-02-2005
fileno
And it has a man page...."man fileno".
Login or Register to Ask a Question

Previous Thread | Next Thread

3 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Shell script (sh file) logic to compare contents of one file with another file and output to file

Shell script logic Hi I have 2 input files like with file 1 content as (file1) "BRGTEST-242" a.txt "BRGTEST-240" a.txt "BRGTEST-219" e.txt File 2 contents as fle(2) "BRGTEST-244" a.txt "BRGTEST-244" b.txt "BRGTEST-231" c.txt "BRGTEST-231" d.txt "BRGTEST-221" e.txt I want to get... (22 Replies)
Discussion started by: pottic
22 Replies

2. Shell Programming and Scripting

Compare 2 text file with 1 column in each file and write mismatch data to 3rd file

Hi, I need to compare 2 text files with around 60000 rows and 1 column. I need to compare these and write the mismatch data to 3rd file. File1 - file2 = file3 wc -l file1.txt 58112 wc -l file2.txt 55260 head -5 file1.txt 101214200123 101214700300 101250030067 101214100500... (10 Replies)
Discussion started by: Divya Nochiyil
10 Replies

3. Shell Programming and Scripting

Match list of strings in File A and compare with File B, C and write to a output file in CSV format

Hi Friends, I'm a great fan of this forum... it has helped me tone my skills in shell scripting. I have a challenge here, which I'm sure you guys would help me in achieving... File A has a list of job ids and I need to compare this with the File B (*.log) and File C (extend *.log) and copy... (6 Replies)
Discussion started by: asnandhakumar
6 Replies
Login or Register to Ask a Question