int copy_fd(int ifd, int ofd)
{
while (1) {
- int len;
char buffer[8192];
char *buf = buffer;
- len = read(ifd, buffer, sizeof(buffer));
+ ssize_t len = xread(ifd, buffer, sizeof(buffer));
if (!len)
break;
if (len < 0) {
- if (errno == EAGAIN)
- continue;
+ int read_error = errno;
+ close(ifd);
return error("copy-fd: read returned %s",
- strerror(errno));
+ strerror(read_error));
}
- while (1) {
- int written = write(ofd, buf, len);
+ while (len) {
+ int written = xwrite(ofd, buf, len);
if (written > 0) {
buf += written;
len -= written;
- if (!len)
- break;
}
- if (!written)
+ else if (!written) {
+ close(ifd);
return error("copy-fd: write returned 0");
- if (errno == EAGAIN || errno == EINTR)
- continue;
- return error("copy-fd: write returned %s",
- strerror(errno));
+ } else {
+ int write_error = errno;
+ close(ifd);
+ return error("copy-fd: write returned %s",
+ strerror(write_error));
+ }
}
}
close(ifd);
return 0;
}
+int copy_file(const char *dst, const char *src, int mode)
+{
+ int fdi, fdo, status;
+
+ mode = (mode & 0111) ? 0777 : 0666;
+ if ((fdi = open(src, O_RDONLY)) < 0)
+ return fdi;
+ if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
+ close(fdi);
+ return fdo;
+ }
+ status = copy_fd(fdi, fdo);
+ if (close(fdo) != 0)
+ return error("%s: close error: %s", dst, strerror(errno));
+
+ if (!status && adjust_shared_perm(dst))
+ return -1;
+
+ return status;
+}