doubts reg inodes Post: 93680

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Top Forums Shell Programming and Scripting doubts reg inodes Post 93680 by jim mcnamara on Wednesday 21st of December 2005 09:58:02 AM

12-21-2005

Registered User

chmod has no effect on a file descriptor that is already open. The code will keep writing to the file. This is because permissions checking occurs only when the process first tries to open the file.

Code:

/* filetest.c will this keep writing after a chmod on the file mid-way? */
#include <stdio.h>
#include <stdlib.h>

#define ck(x)if((x)==1){perror("error on file");exit(EXIT_FAILURE);}
int main()
{
	FILE *out=fopen("./myfile","w");
	char tmp[32]={0x0};
	int i=0;

	for(i=0;i<1000;i++) ck(fprintf(out,"%d\n",i));
	printf("We are pausing now... push <Enter> to continue.. ");    
	fgets(tmp,sizeof(tmp),stdin);
	system("chmod 000 ./myfile");
	for(i=0;i<1000;i++) ck(fprintf(out,"%d\n",i));
    ck(fclose(out));
    printf("exiting with no errors...\n");
    return 0;
}

output:

Quote:

kcsdev:/home/jmcnama> cc filetest.c
kcsdev:/home/jmcnama> a.out
We are pausing now... push <Enter> to continue..
exiting with no errors...
kcsdev:/home/jmcnama> ll ./myfile
---------- 1 jmcnama prog 7780 Dec 21 07:51 ./myfile
kcsdev:/home/jmcnama> wc -l myfile
wc: cannot open myfile
kcsdev:/home/jmcnama> chmod 777 myfile
kcsdev:/home/jmcnama> wc -l myfile
2000 myfile
kcsdev:/home/jmcnama>

jim mcnamara

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rsvg

rsvg(1) 							   User Commands							   rsvg(1)

NAME

       rsvg - convert SVG files into raster images

SYNOPSIS

       rsvg  [--dpi  number]  [--format  png|jpeg] [--height integer] [--version] [--width integer] [--x-zoom number] [--y-zoom number] infile.svg
       outfile.png|outfile.jpeg

DESCRIPTION

       rsvg converts SVG images into PNG and JPEG raster images.

OPTIONS

       The following options are supported:

       --dpi number    Set the resolution of the image in pixels per inch. The default value is 90dpi. You can also use -d to specify this option.

       --format png | jSpecify the output format for the converted image. The default value is png. You can also use -f to specify this option.

       --height integerSpecify the height of the converted image. The default value is the height of the original image. You can also  use  -h	to
		       specify this option.

       --version       Display rsvg version information. You can also use -v to specify this option.

       --width integer Specify	the  width  of	the  converted image. The default value is the width of the original image. You can also use -w to
		       specify this option.

       --x-zoom number X Zoom factor, as a percentage. The default value is 1.0.  You can also use -x to specify this option.

       --y-zoom number Y Zoom factor, as a percentage. The default value is 1.0.  You can also use -y to specify this option.

OPERANDS

       The following operands are supported:

       infile.svg      The name of the input SVG file.

       outfile.png     The name of the converted PNG file.

       outfile.jpeg    The name of the converted JPEG file.

EXAMPLES

       Example 1: Converting an SVG Image to PNG

       example% rsvg myfile.svg myfile.png

       Example 2: Converting an SVG Image to JPEG at 300dpi Resolution

       example% rsvg -f jpeg -d 300 myfile.svg myfile.jpg

EXIT STATUS

       The following exit values are returned:

       0	Application exited successfully

       >0	Application exited with failure

FILES

       The following files are used by this application:

       /usr/bin/rsvg	       Executable to convert SVG files into raster images

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWgnome-base-libs	   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |External			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       http://librsvg.sourceforge.net/

       http://www.w3.org/TR/SVG11/

NOTES

       Original man page written by Dom Lachowicz (cinamod@hotmail.com), Alex Larsson (alex@redhat.com), and others.

       Updated by Laszlo Peter, Sun Microsystems Inc., 2004.

SunOS 5.10							    7 Sep 2004								   rsvg(1)

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