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Copy a file using UNIX-system calls
Post 302300880 by c_d on Wednesday 25th of March 2009 09:47:46 AM
03-25-2009
Copy a file using UNIX-system calls
Code:
#include<unistd.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<stdlib.h>
int main( int argc,char *argv[] )
{
char buf;
int sourcefile,destfile,n;
if(argc!=3)
{
write(STDOUT_FILENO,"prgm1 <sourcefile> <destination file>\n",50);
exit(1);
}
else
{
sourcefile=open(argv[1],O_RDONLY);
if(sourcefile==-1)
{
perror("SOURCE FILE ERROR");
exit(0);
}
else
{
destfile=open(argv[2],O_WRONLY | O_CREAT , 0641);
if(destfile==-1)
{
perror("DESTINATION FILE ERROR");
exit(0);
}
else
{
while((n=read(sourcefile,&buf,1)) != -1)
{
write( destfile, &buf, 1 );
}
write(STDOUT_FILENO, "FILES COPIED\n" , 15);
close(sourcefile);
close(destfile);
}
}
}
return 0;
}
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LEARN ABOUT FREEBSD
ctfmerge
CTFMERGE(1) BSD General Commands Manual CTFMERGE(1) NAME
ctfmerge -- merge several CTF data sections into one SYNOPSIS
ctfmerge [-fgstv] -l label -L labelenv -o outfile file ... ctfmerge [-fgstv] -l label -L labelenv -o outfile -d uniqfile [-g] [-D uniqlabel] file ... ctfmerge [-fgstv] -l label -L labelenv -o outfile -w withfile file ... ctfmerge [-g] -c srcfile destfile DESCRIPTION
The ctfmerge utility merges several CTF data sections from several files into one output file, unifying common data. The following options are available: -f Match global symbols to global CTF data. -g Don't delete the original debugging sections. -s Use the .dynsym ELF section instead of the .symtab ELF section. -t Make sure that all object files have a CTF section. -v Enable verbose mode. -l label Sets the label as label. -L labelenv Instructs ctfmerge to read the label from the environment variable labelenv. -o outfile Use outfile to store the merged CTF data. -d uniqfile Uniquify against uniqfile. -d uniqlabel Uniquify against label uniqlabel -w withfile Additive merge with withfile. -c srcfile destfile Copy CTF data from srcfile into destfile. EXIT STATUS
The ctfmerge utility exits 0 on success, and >0 if an error occurs. SEE ALSO
ctfconvert(1), ctfdump(1) HISTORY
The ctfmerge utility first appeared in FreeBSD 7.0. AUTHORS
The CTF utilities came from OpenSolaris. BSD
July 7, 2010 BSD