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3396c97da9
Now that the new CMake build system is encouraging us to lay out the code like a set of libraries, it seems like a good idea to make them look more _like_ libraries, by putting things into separate modules as far as possible. This fixes several previous annoyances in which you had to link against some object in order to get a function you needed, but that object also contained other functions you didn't need which included link-time symbol references you didn't want to have to deal with. The usual offender was subsidiary supporting programs including misc.c for some innocuous function and then finding they had to deal with the requirements of buildinfo(). This big reorganisation introduces three new subdirectories called 'utils', one at the top level and one in each platform subdir. In each case, the directory contains basically the same files that were previously placed in the 'utils' build-time library, except that the ones that were extremely miscellaneous (misc.c, utils.c, uxmisc.c, winmisc.c, winmiscs.c, winutils.c) have been split up into much smaller pieces.
56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
/*
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* Set and clear the O_NONBLOCK fcntl option on an open file.
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*
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* We don't realistically expect these operations to fail (the most
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* plausible error condition is EBADF, but we always believe ourselves
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* to be passing a valid fd so even that's an assertion-fail sort of
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* response), so we don't make any effort to return sensible error
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* codes to the caller - we just log to standard error and die
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* unceremoniously.
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*
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* Returns the previous state of O_NONBLOCK.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <fcntl.h>
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#include "putty.h"
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bool nonblock(int fd)
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{
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int fdflags;
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fdflags = fcntl(fd, F_GETFL);
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if (fdflags < 0) {
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fprintf(stderr, "%d: fcntl(F_GETFL): %s\n", fd, strerror(errno));
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exit(1);
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}
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if (fcntl(fd, F_SETFL, fdflags | O_NONBLOCK) < 0) {
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fprintf(stderr, "%d: fcntl(F_SETFL): %s\n", fd, strerror(errno));
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exit(1);
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}
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return fdflags & O_NONBLOCK;
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}
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bool no_nonblock(int fd)
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{
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int fdflags;
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fdflags = fcntl(fd, F_GETFL);
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if (fdflags < 0) {
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fprintf(stderr, "%d: fcntl(F_GETFL): %s\n", fd, strerror(errno));
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exit(1);
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}
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if (fcntl(fd, F_SETFL, fdflags & ~O_NONBLOCK) < 0) {
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fprintf(stderr, "%d: fcntl(F_SETFL): %s\n", fd, strerror(errno));
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exit(1);
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}
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return fdflags & O_NONBLOCK;
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}
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