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Determine behaviour of EVFILT_WRITE for regular files on FreeBSD
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/* | ||
* Copyright (c) 2024 Arran Cudbard-Bell <a.cudbardb@freeradius.org> | ||
* | ||
* Permission to use, copy, modify, and distribute this software for any | ||
* purpose with or without fee is hereby granted, provided that the above | ||
* copyright notice and this permission notice appear in all copies. | ||
* | ||
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | ||
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | ||
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | ||
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | ||
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | ||
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | ||
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | ||
*/ | ||
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#include "common.h" | ||
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/** Test if we can setup an event to write to a regular file | ||
* | ||
* Setting up a write event on a regular file doesn't make much sense | ||
* but it is allowed by kqueue, so check we exhibit similar behaviour. | ||
*/ | ||
void | ||
test_kevent_write_regular_file(struct test_context *ctx) | ||
{ | ||
struct kevent kev, ret[1]; | ||
int fd; | ||
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fd = open(ctx->testfile, O_CREAT | O_WRONLY); | ||
if (fd < 0) | ||
abort(); | ||
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EV_SET(&kev, fd, EVFILT_WRITE, EV_ADD, 0, 0, &fd); | ||
kevent_rv_cmp(0, kevent(ctx->kqfd, &kev, 1, NULL, 0, NULL)); | ||
kevent_get(ret, NUM_ELEMENTS(ret), ctx->kqfd, 1); | ||
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/* File should appear immediately writable */ | ||
kevent_get(NULL, 0, ctx->kqfd, 1); | ||
kevent_cmp(&kev, ret); | ||
if (write(fd, "test", 4) != 4) { | ||
printf("failed writing to set file: %s", strerror(errno)); | ||
abort(); | ||
} | ||
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/* ...should still be writable */ | ||
kevent_get(NULL, 0, ctx->kqfd, 1); | ||
kevent_cmp(&kev, ret); | ||
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kev.flags = EV_DELETE; | ||
kevent_rv_cmp(0, kevent(ctx->kqfd, &kev, 1, NULL, 0, NULL)); | ||
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close(fd); | ||
unlink(ctx->testfile); | ||
} | ||
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void | ||
test_evfilt_write(struct test_context *ctx) | ||
{ | ||
char *tmpdir = getenv("TMPDIR"); | ||
if (tmpdir == NULL) | ||
#ifdef __ANDROID__ | ||
tmpdir = "/data/local/tmp"; | ||
#else | ||
tmpdir = "/tmp"; | ||
#endif | ||
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snprintf(ctx->testfile, sizeof(ctx->testfile), "%s/kqueue-test%d.tmp", | ||
tmpdir, testing_make_uid()); | ||
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test(kevent_write_regular_file, ctx); | ||
} |