A program named mycat.c is given out as below :
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
int main( int argc, char *argv[] )
{
int i, fd, ch; // declare local variables
for (i = 1; i < argc; i++)
{
fd = open( argv[i], O_RDONLY );
if ( fd < 0 ) { perror( argv[i] ); continue; }
while ( read( fd, &ch, 1 ) == 1 )
write( STDOUT_FILENO, &ch, 1 );
close( fd );
}
}
after compiling, we run ./mycat /proc/self/maps in Linux and get
the results as the following figure, please give the
brief
explanation
s of the result from the views of virtual memory management and
the segment -page scheme.
