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When CONFIG_VFS_SUPPORT_IO is disabled, _read_r and _write_r implementations in syscalls.c are used to provide console I/O via esp_rom_uart_tx_one_char/esp_rom_uart_rx_one_char. When newlib opens a (FILE*) stream, it calls fstat to check if the underlying file is character-oriented. In this case, it configures the stream to use line buffering. Otherwise (or if fstat fails) the stream is opened as block buffered. Since fstat wasn't provided, stdin/stdout/stderr streams got opened in block buffered mode. For console, we need line buffered output so that the stream buffer is flushed each time a complete line (ending with '\n') is sent to stdout or stderr. Fix by implementing _fstat_r stub, setting st->st_mdoe=S_IFCHR. |
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| .. | ||
| platform_include | ||
| port | ||
| priv_include | ||
| test | ||
| test_apps | ||
| .gitignore | ||
| .gitmodules | ||
| abort.c | ||
| assert.c | ||
| CMakeLists.txt | ||
| component.mk | ||
| COPYING.NEWLIB | ||
| esp32-spiram-rom-functions-c.lf | ||
| heap.c | ||
| Kconfig | ||
| locks.c | ||
| Makefile.old | ||
| newlib_init.c | ||
| newlib.lf | ||
| poll.c | ||
| pthread.c | ||
| random.c | ||
| reent_init.c | ||
| stdatomic.c | ||
| syscalls.c | ||
| system_libs.lf | ||
| termios.c | ||
| time.c | ||