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Full Discussion: help to find find filename usingFile pointer in c
Top Forums UNIX for Dummies Questions & Answers help to find find filename usingFile pointer in c Post 302130670 by Perderabo on Tuesday 7th of August 2007 10:23:34 AM
Old 08-07-2007
In the case of "prog_a | prog_b", prog_b won't have any name associated with FD 0. There are lots of problems like that. lsof is a program that can display pretty good info for most FD's of most processes, but it must run suid'ed to root. Get lsof and run it to see if that sort of info could help you. If so, use popen() to run lsof from your process and parse the lsof output to get what you need. Something like this is the only way.
 

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LEARN ABOUT MOJAVE

pldd

PLDD(1) 							 Linux User Manual							   PLDD(1)

NAME

       pldd - display dynamic shared objects linked into a process

SYNOPSIS

       pldd pid
       pldd option

DESCRIPTION

       The  pldd  command  displays a list of the dynamic shared objects that are linked into the process with the specified process ID.  The list
       includes the libraries that have been dynamically loaded using dlopen(3).

OPTIONS

       -?, --help
	      Display program help message.

       --usage
	      Display a short usage message.

       -V, --version
	      Display the program version.

EXIT STATUS

       On success, pldd exits with the status 0.  If the specified process does not exist, the user does not have permission to access its dynamic
       shared  object  list, or no command-line arguments are supplied, pldd exists with a status of 1.  If given an invalid option, it exits with
       the status 64.

VERSIONS

       pldd is available since glibc 2.15.

CONFORMING TO

       The pldd command is not specified by POSIX.1.  Some other systems have a similar command.

NOTES

       The command

	   lsof -p PID

       also shows output that includes the dynamic shared objects that are linked into a process.

       The gdb(1) info shared command also shows the shared libraries being used by a process, so that one can obtain similar output to pldd using
       a command such as the following (to monitor the process with the specified pid):

	   $ gdb -ex "set confirm off" -ex "set height 0" -ex "info shared" 
		   -ex "quit" -p $pid | grep '^0x.*0x'

BUGS

       Since glibc 2.19, pldd is broken: it just hangs when executed.  It is unclear if it will ever be fixed.

EXAMPLE

       $ echo $$	       # Display PID of shell
       1143
       $ pldd $$	       # Display DSOs linked into the shell
       1143:	 /usr/bin/bash
       linux-vdso.so.1
       /lib64/libtinfo.so.5
       /lib64/libdl.so.2
       /lib64/libc.so.6
       /lib64/ld-linux-x86-64.so.2
       /lib64/libnss_files.so.2

SEE ALSO

       ldd(1), lsof(1), dlopen(3), ld.so(8)

COLOPHON

       This  page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

GNU
								    2017-09-15								   PLDD(1)
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