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test: add WASI test for file resizing
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This commit adds a WASI test to cover the following functions:

- __wasi_fd_filestat_set_size()
- __wasi_fd_tell()

PR-URL: #31617
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
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cjihrig authored and addaleax committed Sep 22, 2020
1 parent 6ddeee4 commit 55ba743
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39 changes: 39 additions & 0 deletions test/wasi/c/ftruncate.c
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#include <sys/stat.h>
#include <assert.h>
#include <fcntl.h>
#include <unistd.h>

#define BASE_DIR "/tmp"
#define OUTPUT_DIR BASE_DIR "/testdir"
#define PATH OUTPUT_DIR "/output.txt"

int main(void) {
struct stat st;
int fd;

(void)st;
assert(0 == mkdir(OUTPUT_DIR, 0755));

fd = open(PATH, O_CREAT | O_WRONLY, 0666);
assert(fd != -1);

/* Verify that the file is initially empty. */
assert(0 == fstat(fd, &st));
assert(st.st_size == 0);
assert(0 == lseek(fd, 0, SEEK_CUR));

/* Increase the file size using ftruncate(). */
assert(0 == ftruncate(fd, 500));
assert(0 == fstat(fd, &st));
assert(st.st_size == 500);
assert(0 == lseek(fd, 0, SEEK_CUR));

/* Truncate the file using ftruncate(). */
assert(0 == ftruncate(fd, 300));
assert(0 == fstat(fd, &st));
assert(st.st_size == 300);
assert(0 == lseek(fd, 0, SEEK_CUR));

assert(0 == close(fd));
return 0;
}
1 change: 1 addition & 0 deletions test/wasi/test-wasi.js
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Expand Up @@ -71,6 +71,7 @@ if (process.argv[2] === 'wasi-child') {
runWASI({ test: 'exitcode', exitCode: 120 });
runWASI({ test: 'fd_prestat_get_refresh' });
runWASI({ test: 'freopen', stdout: `hello from input2.txt${EOL}` });
runWASI({ test: 'ftruncate' });
runWASI({ test: 'getentropy' });

// Tests that are currently unsupported on IBM i PASE.
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