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// Copyright (c) 2015-2016 Nuxi, https://nuxi.nl/
//
// SPDX-License-Identifier: BSD-2-Clause
#include <wasi/api.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
int fcntl(int fildes, int cmd, ...) {
switch (cmd) {
case F_GETFD:
// Act as if the close-on-exec flag is always set.
return FD_CLOEXEC;
case F_SETFD:
// The close-on-exec flag is ignored.
return 0;
case F_GETFL: {
// Obtain the flags and the rights of the descriptor.
__wasi_fdstat_t fds;
__wasi_errno_t error = __wasi_fd_fdstat_get(fildes, &fds);
if (error != 0) {
errno = error;
return -1;
}
// Roughly approximate the access mode by converting the rights.
int oflags = fds.fs_flags;
if ((fds.fs_rights_base &
(__WASI_RIGHTS_FD_READ | __WASI_RIGHTS_FD_READDIR)) != 0) {
if ((fds.fs_rights_base & __WASI_RIGHTS_FD_WRITE) != 0)
oflags |= O_RDWR;
else
oflags |= O_RDONLY;
} else if ((fds.fs_rights_base & __WASI_RIGHTS_FD_WRITE) != 0) {
oflags |= O_WRONLY;
} else {
oflags |= O_SEARCH;
}
return oflags;
}
case F_SETFL: {
// Set new file descriptor flags.
va_list ap;
va_start(ap, cmd);
int flags = va_arg(ap, int);
va_end(ap);
__wasi_fdflags_t fs_flags = flags & 0xfff;
__wasi_errno_t error =
__wasi_fd_fdstat_set_flags(fildes, fs_flags);
if (error != 0) {
errno = error;
return -1;
}
return 0;
}
default:
errno = EINVAL;
return -1;
}
}
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