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#include <errno.h>
#include "buffer.h"
int buffer_stubborn(int (*op)(),int fd,const char* buf, unsigned long int len) {
int w;
while (len) {
if ((w=op(fd,buf,len))<0) {
if (errno == EINTR) continue;
return -1;
};
buf+=w;
len-=w;
}
return 0;
}