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C LINUX how to achieve functional copy of the document?
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The C Programming Linux beginner.
This function does not know how to achieve? What specific knowledge to use?
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Re : How to achieve the Linux C functional copy of the document?
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System
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Re : How to achieve the Linux C functional copy of the document?
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May open two descriptors, a read (), another write (), would not achieve!
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Re : How to achieve the Linux C functional copy of the document?
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Say the details? I just portal, and many unclear ah. For example, the first category of documents : :
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Re : How to achieve the Linux C functional copy of the document?
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Provide an example for you to see, I was not very proficient in :
I hope you can understand
#include "Stdio.h>
#include "String.h>
#include "Assert.h>
#include "Sys/types.h>
#include "Sys/stat.h>
#inlcude "Fcntl.h>
Int copy_file (char *form, char *to)
{
Int form_fd, to_fd;
Char ch = '\0';
Int with officers = 0
Assert (form> NULL);
Assert (to> NULL);
Form_fd to_fd = 0 = 0
Form_fd = open (form, O_RDONLY);
If (form_fd "0)
Return 1;
To_fd = open (to, O_RDONLY);
If (to_fd "0)
Return 1;
If (to_fd "0)
{
Close (to_fd);
Return 1;
}
To_fd = open (to, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
If (to_fd "0)
Return 1;
While (0)
{
With officers = read (form_fd, &ch, 1);
If (with officers of the "0)
Return 1;
If (with officers ====== 0)
Break;
Write (to_fd, &ch, 1);
}
Close (form_fd);
Close (to_fd);
Return 0
}
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Re : How to achieve the Linux C functional copy of the document?
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C Bible buy the bar, you have to have all the above, a little basic work.
Today interview for the gang, which alone of this question, !@#$%^&
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Re : How to achieve the Linux C functional copy of the document?
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I suggest you look at the books or more, such as c language portal type of books, so many procedures can be found.
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Re : How to achieve the Linux C functional copy of the document?
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I suggest u use "int link (const char *oldpath, const char *newpath); "
See details man link :
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Re : How to achieve the Linux C functional copy of the document?
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You find a serious look at the book and COPY What is the difference between LINK
This is your conceptual quote
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Re : How to achieve the Linux C functional copy of the document?
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Thank you!
Well, if I want to add a Linux system call, the system transfer function is to copy files, what ways ah? Calling in another procedure like how the new system call?
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Re : How to achieve the Linux C functional copy of the document?
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See numerous articles on what you found in a system call to increase the KERNEL
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Re : How to achieve the Linux C functional copy of the document?
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I used this procedure successfully translated (Of course, it is a typo include--inlcude), but has no operating results, please! Functional copies of the guidance can not be achieved!
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Re : How to achieve the Linux C functional copy of the document?
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You program named test.c
Gcc test.c
. /a.out Input-file-name output-file-name
Will be OK!
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Re : How to achieve the Linux C functional copy of the document?
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Tried, but no matter how operations are not the desired results.
Canada trails were not complicated and are not the objectives of paper trails.
The interview
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Re : How to achieve the Linux C functional copy of the document?
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I tried, no problem.
Operating procedure when you have advice?
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Re : How to achieve the Linux C functional copy of the document?
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No suggested.
For instance, under a document called hello.c in /pub/program
I operation. /copy.out /pub/program/hello.c /pub/program/aa.c
Results have nothing.
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