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SubjectRe: Can EINTR be handled the way BSD handles it? -- a plea from a user-land programmer...
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"Theodore Y. Ts'o" <tytso@MIT.EDU> writes:

> Arguably though the bug is in glibc, in that if it's using signals
> behinds the scenes, it should have passed SA_RESTART to sigaction.

Why are you talking such a nonsense?

>
> However, from a portability point of view, you should *always* surround
> certain system calls with while loops, since even if your program
> doesn't use signals, if you run that program on a System-V derived Unix
> system, and someone types ^Z at the wrong moment, you can also get an
> EINTR. Similarly, you should always check the return value from write
> and make sure all of what you asked to be written, was actually
> written.
>
> What I normally do is have a full_write routine which looks something
> like this:
>
> static errcode_t full_write(int fd, void *buf, int count)
> {
> char *cp = buf;
> int left = count, c;
>
> while (left) {
> c = write(fd, cp, left);
> if (c < 0) {
> if (errno == EINTR || errno == EAGAIN)
> continue;
> return errno;
> }
> left -= c;
> cp += c;
> }
> return 0;
> }
>
> It's like checking the return value from malloc(). Not everyone does
> it, but even if it's not needed 99% of the time, it's a darned good idea
> to do that.
>
> - Ted
> -
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>
>

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