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wasi: apply wasm_runtime_begin_blocking_op to poll as well #3080

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Jan 25, 2024
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wasi: apply wasm_runtime_begin_blocking_op to poll as well #3080

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21 changes: 21 additions & 0 deletions core/iwasm/libraries/libc-wasi/sandboxed-system-primitives/src/blocking_op.c
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@

#include "ssp_config.h"
#include "blocking_op.h"
#include "libc_errno.h"

__wasi_errno_t
blocking_op_close(wasm_exec_env_t exec_env, os_file_handle handle,
Expand Down Expand Up @@ -170,3 +171,23 @@ blocking_op_openat(wasm_exec_env_t exec_env, os_file_handle handle,
wasm_runtime_end_blocking_op(exec_env);
return error;
}

#ifndef BH_PLATFORM_WINDOWS
/* REVISIT: apply the os_file_handle style abstraction for pollfd? */
__wasi_errno_t
blocking_op_poll(wasm_exec_env_t exec_env, struct pollfd *pfds, nfds_t nfds,
int timeout_ms, int *retp)
{
int ret;
if (!wasm_runtime_begin_blocking_op(exec_env)) {
return __WASI_EINTR;
}
ret = poll(pfds, nfds, timeout_ms);
wasm_runtime_end_blocking_op(exec_env);
if (ret == -1) {
return convert_errno(errno);
}
*retp = ret;
return 0;
}
#endif
8 changes: 7 additions & 1 deletion core/iwasm/libraries/libc-wasi/sandboxed-system-primitives/src/blocking_op.h
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Expand Up @@ -50,4 +50,10 @@ __wasi_errno_t
blocking_op_openat(wasm_exec_env_t exec_env, os_file_handle handle,
const char *path, __wasi_oflags_t oflags,
__wasi_fdflags_t fd_flags, __wasi_lookupflags_t lookup_flags,
wasi_libc_file_access_mode access_mode, os_file_handle *out);
wasi_libc_file_access_mode access_mode, os_file_handle *out);

#ifndef BH_PLATFORM_WINDOWS
__wasi_errno_t
blocking_op_poll(wasm_exec_env_t exec_env, struct pollfd *pfds, nfds_t nfds,
int timeout, int *retp);
#endif
9 changes: 4 additions & 5 deletions core/iwasm/libraries/libc-wasi/sandboxed-system-primitives/src/posix.c
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Expand Up @@ -2230,11 +2230,10 @@ wasmtime_ssp_poll_oneoff(wasm_exec_env_t exec_env, struct fd_table *curfds,
timeout = -1;
}

int ret = poll(pfds, nsubscriptions, timeout);

__wasi_errno_t error = 0;
if (ret == -1) {
error = convert_errno(errno);
int ret;
int error = blocking_op_poll(exec_env, pfds, nsubscriptions, timeout, &ret);
if (error != 0) {
/* got an error */
}
else if (ret == 0 && *nevents == 0 && clock_subscription != NULL) {
// No events triggered. Trigger the clock event.
Expand Down
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