<div>
You could try scaning the __iob[] structure.
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You could try scaning the __iob[] structure.

<div>
Sorry, ozo, I didn't see you already post a comment.
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Sorry, ozo, I didn't see you already post a comment.

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Also, to ozo, my understanding is, __iob[] &nbsp;only includes fds opened via fopen() , fdopen() and fdopen(). Other fds opened through open(), pipe(), dup(), socket(), accept(), &nbsp;etc.. are not included. 
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Also, to ozo, my understanding is, __iob[]  only includes fds opened via fopen() , fdopen() and fdopen(). Other fds opened through open(), pipe(), dup(), socket(), accept(),  etc.. are not included.

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code correction:<br />
<br />
the last code line in the proposed answer:<br />
<br />
&nbsp; &nbsp; &nbsp;return count -3;<br />
<br />
should change to:<br />
<br />
&nbsp; &nbsp; &nbsp;if( pid == getpid() )<br />
&nbsp; &nbsp; &nbsp; &nbsp; return count - 3;<br />
&nbsp; &nbsp; &nbsp;else<br />
&nbsp; &nbsp; &nbsp; &nbsp; return count -2;
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code correction:

the last code line in the proposed answer:

     return count -3;

should change to:

     if( pid == getpid() )
        return count - 3;
     else
        return count -2;

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<div class="content wysiwyg-content">
Hi !<br />
<br />
How can I find out how many file descriptors a process has open ? &nbsp;Either I can use a system call but preferrably I would like to put it in the program itself. &nbsp;I am on Sun Solaris machine.<br />
<br />
Marvin.
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Hi !

How can I find out how many file descriptors a process has open ?  Either I can use a system call but preferrably I would like to put it in the program itself.  I am on Sun Solaris machine.

Marvin.

How many file open ?

C is a general-purpose, imperative computer programming language, supporting structured programming, lexical variable scope and recursion, while a static type system prevents many unintended operations. By design, C provides constructs that map efficiently to typical machine instructions, so it has found lasting use in applications that had formerly been coded in assembly language, including operating systems as well as various application software for computers ranging from supercomputers to embedded systems. It is distinct from C++ (which has its roots in C) and C#, and many later languages have borrowed directly or indirectly from C.