copy_file.c

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//******************************************************************************
 
#include <sys/errno.h>
 
#if defined(__APPLE__)
#include <copyfile.h>
#else
 
#include <fcntl.h>
#include <sys/sendfile.h>
#include <sys/stat.h>
 
#define COPYFILE_ALL 0
 
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
size_t copyfile(const char *src, const char *dest, const int unused_1, const int unused_2) {
    
    // Open source file as read only.
    int read_file = open(src, O_RDONLY);
 
    // Need the permissions and file size values of the source file.
    struct stat stat_buffer;
    fstat(read_file, &stat_buffer);
 
    // Open the destination file as write only with the same permissions as the
    // source file.
    int write_file = open(dest, O_WRONLY | O_CREAT, stat_buffer.st_mode);
    
    // Copy the file.
    off_t bytesCopied = 0;
    size_t error = sendfile(write_file, read_file, &bytesCopied, stat_buffer.st_size);
    
    // Close file handles.
    close(read_file);
    close(write_file);
}
 
#endif
 
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
int copy_file_c(const char *src, const char *dest) {
    if (copyfile(src, dest, 0, COPYFILE_ALL) < 0) {
        return errno;
    } else {
        return 0;
    }
}