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Full Discussion: fork function
Top Forums UNIX for Dummies Questions & Answers fork function Post 46844 by a25khan on Tuesday 27th of January 2004 08:31:29 PM
Old 01-27-2004
hi there,
for instance you had it like this

int main()
{int pid = fork();
exit(0);
}

so the above code is parent process? lets assume that the fork succeeds.
u said, a complete copy of the process springs into existence. does
that mean that the code
int main() { int pid = fork(); exit(0); } will be regenerated ? if
so, then this will be always recurring or recrusive. this child process
will keep generating different child processes! n this will never
come to an end? will it!?

then u said "both copies store somethin in pid". we just did
fork once, why are u saying both copies? i dont' quite get that!

then u said
The child will store 0 in pid.

The parent will store the pid of the child in pid.

but the code that i had has got just one pid! hence the call
pid = fork() would store the pid of child. and child would store
0 in pid, but wouldn't the child have the same code as parent since
the child process is a copy of a process, so the child would store
another childs pid! when would the child store 0 in pid!

what i m tryin to say is if an exact copy of the process is created,
how would that come to an end, since the child will do fork as well
as it has the same code involved as in its parents!

i know i m not right, but i don't quite get this here. i may sound
stupid but i am probably missing something.
Perderabo, can you give me more insight on that!
Thanks
 

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LEARN ABOUT V7

ppmtosixel

ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.	The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
	      pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order	of  magni-
	      tude larger than a compressed file and prints much slower.

       -margin
	      If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
	      fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater	than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

								   26 April 1991						     ppmtosixel(1)
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