YAMAMOTO Takashi
a76cdfda47
Fix crashes with "popen" example. ``` dump_tasks: PID GROUP PRI POLICY TYPE NPX STATE EVENT SIGMASK STACKBASE STACKSIZE USED FILLED COMMAND dump_tasks: ---- --- --- -------- ------- --- ------- ---------- ---------------- 0x800525e0 2048 1016 49.6% irq dump_task: 0 0 0 FIFO Kthread - Ready 0000000000000000 0x80056550 2032 1168 57.4% Idle_Task dump_task: 1 0 224 RR Kthread - Waiting Semaphore 0000000000000000 0x80057500 1968 768 39.0% hpwork 0x80051470 0x800514b8 dump_task: 2 0 100 RR Kthread - Waiting Semaphore 0000000000000000 0x80057e48 1960 720 36.7% lpwork 0x80051400 0x80051448 dump_task: 3 3 100 RR Task - Waiting Semaphore 0000000000000000 0x80058ca0 3024 3008 99.4%! nsh_main dump_task: 4 4 100 RR Task - Ready 0000000000000000 0x8005a2f0 2000 1376 68.8% popen riscv_exception: EXCEPTION: Load access fault. MCAUSE: 0000000000000005, EPC: 000000008000594e, MTVAL: fffffffffffffffc riscv_exception: PANIC!!! Exception = 0000000000000005 ```
Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).
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