c - 写入返回值 c

Question

在 linux 机器上，

写入文件的 write() 或 writev() 写入的字节数少于给定的字节数的原因是什么？

我知道它是一个有效的返回值，可以返回 > 0 和 < 您给 write 调用的大小，但我很好奇为什么会发生这种情况......

Answer 1

the documentation 中列出了几个原因，包括:

• If a write() requests that more bytes be written than there is room for (for example, the process' file size limit or the physical end of a medium), only as many bytes as there is room for shall be written.

• If write() is interrupted by a signal after it successfully writes some data, it shall return the number of bytes written.