11-17-2006
Quote:
Originally Posted by jim mcnamara
1. You can't rename them because they are creations of the kernel.
2. I just tried this - you can create a symlink to the file with ln -s to a directory in /proc, and it works correctly.
??
3. Your first program could read the /proc/whatever/file into a local file then give that file name to prog2
I'm not sure I understand your answers. I think we might be talking past each other so let me see if I can be a little more specific in what I'm doing.
prog2 is just a standard Xwindows application that knows nothing about what I'm trying to do. prog1 is a "wrapper" around it that I wrote. prog2 has been moved out of it's standard location and put somewhere else in the file system. prog1 has taken it's place. It's job is to check the user id and the command line being passed to prog2 to see if it is allowed, and if it is then execute prog2 with that command line. However, I don't want "prog2" showing up in a "ps" listing, so before executing the execv command I change argv[0] to "prog1". So if you just run "ps" prog2 never shows up since the default for ps is to show only the command line, not the actual file name. But if you pass "-o fname" (or use "sdtprocess") then the actual filename shows up, which is bad because the command line says "prog1" and the actual filename says "prog2".
I'm using Solaris 8 if that makes a difference. I've looked at the /proc directory and it's all pid values for directories and each directory has a standard layout. The only place I've found the filenames I'm looking for is in the file "psinfo", which makes sense since there is a "psinfo" structure in the "procfs.h" header with an "fname" field. So I assumed the way to change the value of fname for "prog2" was to find it's pid (no problem there), read in the psinfo file, change the fname field and write it back out. Assuming this can be done, which I suspected could not be, and your comments in 1) above reinforces that.
In your other comments you mention creating a smylink between a directory in /proc and something else (prog2?) or copying a file from the /proc directory and giving that name to prog2. I don't know what you are saying here. Could you explain this further?
Thank you for your reply.
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ECPG(1) PostgreSQL Client Applications ECPG(1)
NAME
ecpg - embedded SQL C preprocessor
SYNOPSIS
ecpg [ option... ] file...
DESCRIPTION
ecpg is the embedded SQL preprocessor for C programs. It converts C programs with embedded SQL statements to normal C code by replacing the
SQL invocations with special function calls. The output files can then be processed with any C compiler tool chain.
ecpg will convert each input file given on the command line to the corresponding C output file. Input files preferrably have the extension
.pgc, in which case the extension will be replaced by .c to determine the output file name. If the extension of the input file is not .pgc,
then the output file name is computed by appending .c to the full file name. The output file name can also be overridden using the -o
option.
This reference page does not describe the embedded SQL language. See the PostgreSQL Programmer's Guide for that.
OPTIONS
ecpg accepts the following command-line arguments:
-c Automatically generate C code from SQL code. Currently, this works for EXEC SQL TYPE.
-D symbol
Define a C preprocessor symbol.
-I directory
Specify an additional include path, used to find files included via EXEC SQL INCLUDE. Defaults are . (current directory),
/usr/local/include, the PostgreSQL include directory which is defined at compile time (default: /usr/local/pgsql/include), and
/usr/include, in that order.
-o filename
Specifies that ecpg should write all its output to the given filename.
-t Turn on autocommit of transactions. In this mode, each query is automatically committed unless it is inside an explicit transaction
block. In the default mode, queries are committed only when EXEC SQL COMMIT is issued.
-v Print additional information including the version and the include path.
---help
Show a brief summary of the command usage, then exit.
--version
Output version information, then exit.
NOTES
When compiling the preprocessed C code files, the compiler needs to be able to find the ECPG header files in the PostgreSQL include direc-
tory. Therefore, one might have to use the -I option when invoking the compiler (e.g., -I/usr/local/pgsql/include).
Programs using C code with embedded SQL have to be linked against the libecpg library, for example using the flags -L/usr/local/pgsql/lib
-lecpg.
The value of either of these directories that is appropriate for the installation can be found out using pg_config(1).
EXAMPLES
If you have an embedded SQL C source file named prog1.pgc, you can create an executable program using the following sequence of commands:
ecpg prog1.pgc
cc -I/usr/local/pgsql/include -c prog1.c
cc -o prog1 prog1.o -L/usr/local/pgsql/lib -lecpg
SEE ALSO
PostgreSQL Programmer's Guide for a more detailed description of the embedded SQL interface
Application 2002-11-22 ECPG(1)