我在 C 中有這個函式，我想用它在非阻塞模式下通過我的 udp 套接字寫入位元組。我應該完成“待完成”部分。任何人都可以幫助我了解該怎么做嗎？回憶那里的 write 功能是否有意義？
ssize_t nonblocking_write_all(int fd, const void *ptr, size_t n)
{
size_t n_left = n;
while (n_left > 0) {
ssize_t n_written = write(fd, ptr, n_left);
if (n_written < 0) {
/*** TO BE DONE START ***/
/*** TO BE DONE END ***/
if (n_left == n)
return -1; /* nothing has been written */
else
break; /* we have written something */
} else if (n_written == 0) {
continue;
}
n_left -= n_written;
ptr = n_written;
}
assert(n - n_left >= 0);
return n - n_left;
}
uj5u.com熱心網友回復：
這有效： n_written=nonblocking_write_all(fd,ptr,n_left);
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