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/*
* Set and clear the O_NONBLOCK fcntl option on an open file.
*
* We don't realistically expect these operations to fail (the most
* plausible error condition is EBADF, but we always believe ourselves
* to be passing a valid fd so even that's an assertion-fail sort of
* response), so we don't make any effort to return sensible error
* codes to the caller - we just log to standard error and die
* unceremoniously.
*
* Returns the previous state of O_NONBLOCK.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include "putty.h"
bool nonblock(int fd)
{
int fdflags;
fdflags = fcntl(fd, F_GETFL);
if (fdflags < 0) {
fprintf(stderr, "%d: fcntl(F_GETFL): %s\n", fd, strerror(errno));
exit(1);
}
if (fcntl(fd, F_SETFL, fdflags | O_NONBLOCK) < 0) {
fprintf(stderr, "%d: fcntl(F_SETFL): %s\n", fd, strerror(errno));
exit(1);
}
return fdflags & O_NONBLOCK;
}
bool no_nonblock(int fd)
{
int fdflags;
fdflags = fcntl(fd, F_GETFL);
if (fdflags < 0) {
fprintf(stderr, "%d: fcntl(F_GETFL): %s\n", fd, strerror(errno));
exit(1);
}
if (fcntl(fd, F_SETFL, fdflags & ~O_NONBLOCK) < 0) {
fprintf(stderr, "%d: fcntl(F_SETFL): %s\n", fd, strerror(errno));
exit(1);
}
return fdflags & O_NONBLOCK;
}
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