|
|
Sponsored Content
Top Forums
Programming
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;
}
|
|
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
What does the system call "dup" do?
What is the difference between dup and dup2
I have a fair idea of what it does but I am confused when its coming down to the exact details...
Please help me!:confused: (2 Replies)
Discussion started by: clickonline1
2 Replies
2. UNIX for Dummies Questions & Answers
Which system calls are made for operations cp and mv (2 Replies)
Discussion started by: gaurava99
2 Replies
3. UNIX for Dummies Questions & Answers
open, creat, read, write, lseek and close
Are they all primitive?
:confused:
*Another Question: is there a different between a system call, and an i/o system call? (2 Replies)
Discussion started by: PlunderBunny
2 Replies
4. Solaris
where can i find the differences in System calls between solaris and aix?
also is it possible to find a comprehensive list of them? (1 Reply)
Discussion started by: TECHRAMESH
1 Replies
5. UNIX Desktop Questions & Answers
Hi,
I'm new to UNIX system calls. Can someone share your knowledge as to how exactly system calls should be executed?
Can they be typed like commands such as mkdir on the terminal itself? Also, are there any websites which will show me an example of the output to expect when a system call like... (1 Reply)
Discussion started by: ilavenil
1 Replies
6. UNIX for Dummies Questions & Answers
Hi all,
I am new here .
I want to know about system call in detail.
As system calls are also function .How system identifies it.:) (2 Replies)
Discussion started by: vishwasrao
2 Replies
7. UNIX for Dummies Questions & Answers
Hello,
how would i be able to call ps in C programming?
thanks,
---------- Post updated at 01:39 AM ---------- Previous update was at 01:31 AM ----------
here's the complete system call, ps -o pid -p %d, getpit() (2 Replies)
Discussion started by: l flipboi l
2 Replies
8. UNIX for Dummies Questions & Answers
I'm currently studying for my exam, and is practicing with sample exam questions.
However there is a question asking "Name THREE UNIX Directory system calls" and the answer given is "opendir, closedir and readdir", however the next question ask "Why is a write directory system call not included... (1 Reply)
Discussion started by: Izzy123
1 Replies
9. UNIX for Dummies Questions & Answers
Hello...
I'm trying to setup a cronjob to record system data using glance at certain times of the day. My question is, how would one export the "Global System Calls" information to a file? Below is the command I have been using and it works to export CPU information.
glance -f ... (0 Replies)
Discussion started by: fumus
0 Replies
10. UNIX for Dummies Questions & Answers
Hi i am very new to programming in UNIX and don't understand the difference between a system call and a normal function call. Also can I implement system calls from within a program? If so could someone please give me an example of a system call from within a program. Lastly, when creating a... (1 Reply)
Discussion started by: bjhum33
1 Replies
LEARN ABOUT DEBIAN
libssh2_sftp_rename_ex
libssh2_sftp_rename_ex(3) libssh2 manual libssh2_sftp_rename_ex(3) NAME
libssh2_sftp_rename_ex - rename an SFTP file SYNOPSIS
#include <libssh2.h> #include <libssh2_sftp.h> int libssh2_sftp_rename_ex(LIBSSH2_SFTP *sftp, const char *source_filename, unsigned int source_filename_len, const char *dest_filename, unsigned int dest_filename_len, long flags); int libssh2_sftp_rename_ex(LIBSSH2_SFTP *sftp, const char *source_filename, const char *dest_filename); DESCRIPTION
sftp - SFTP instance as returned by libssh2_sftp_init(3) sourcefile - Path and name of the existing filesystem entry sourcefile_len - Length of the path and name of the existing filesystem entry destfile - Path and name of the target filesystem entry destfile_len - Length of the path and name of the target filesystem entry flags - Bitmask flags made up of LIBSSH2_SFTP_RENAME_* constants. Rename a filesystem object on the remote filesystem. The semantics of this command typically include the ability to move a filsystem object between folders and/or filesystem mounts. If the LIBSSH2_SFTP_RENAME_OVERWRITE flag is not set and the destfile entry already exists, the operation will fail. Use of the other two flags indicate a preference (but not a requirement) for the remote end to perform an atomic rename operation and/or using native system calls when possible. RETURN VALUE
Return 0 on success or negative on failure. It returns LIBSSH2_ERROR_EAGAIN when it would otherwise block. While LIBSSH2_ERROR_EAGAIN is a negative number, it isn't really a failure per se. ERRORS
LIBSSH2_ERROR_ALLOC - An internal memory allocation call failed. LIBSSH2_ERROR_SOCKET_SEND - Unable to send data on socket. LIBSSH2_ERROR_SOCKET_TIMEOUT - LIBSSH2_ERROR_SFTP_PROTOCOL - An invalid SFTP protocol response was received on the socket, or an SFTP operation caused an errorcode to be returned by the server. SEE ALSO
libssh2_sftp_init(3) libssh2 0.15 1 Jun 2007 libssh2_sftp_rename_ex(3)