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Enable to use BH_VPRINTF macro to redirect stdout output (#560)

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Enable to use BH_VPRINTF macro for platform Linux/Windows/Darwin/VxWorks to redirect the stdout output from platform os_printf/os_vprintf, or the wasi output from wasm app to the vprintf like callback function specified by BH_VPRINTF macro of cmake WAMR_BH_VPRINTF variable.

Signed-off-by: Wenyong Huang <wenyong.huang@intel.com>
This commit is contained in:
Wenyong Huang
2021-03-06 08:29:58 -06:00
committed by GitHub
parent a4239f1ffd
commit a1568825e8
10 changed files with 132 additions and 7 deletions
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22
core/iwasm/libraries/libc-wasi/sandboxed-system-primitives/src/posix.c
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@ -1237,7 +1237,29 @@ __wasi_errno_t wasmtime_ssp_fd_write(
if (error != 0)
return error;
#ifndef BH_VPRINTF
ssize_t len = writev(fd_number(fo), (const struct iovec *)iov, (int)iovcnt);
#else
ssize_t len = 0;
/* redirect stdout/stderr output to BH_VPRINTF function */
if (fd_number(fo) == 1 || fd_number(fo) == 2) {
int i;
const struct iovec *iov1 = (const struct iovec *)iov;
for (i = 0; i < (int)iovcnt; i++, iov1++) {
if (iov1->iov_len > 0 && iov1->iov_base) {
char format[16];
/* make up format string "%.ns" */
snprintf(format, sizeof(format), "%%.%ds", (int)iov1->iov_len);
len += (ssize_t)os_printf(format, iov1->iov_base);
}
}
}
else {
len = writev(fd_number(fo), (const struct iovec *)iov, (int)iovcnt);
}
#endif /* end of BH_VPRINTF */
fd_object_release(fo);
if (len < 0)
return convert_errno(errno);