一同事突然问到的问题：
printf("watchdog fork(): %m\n");
之前也没见过， 在网上搜了下， 原来%m是strerror(errno)的替代， 原文如下：
GNU glibc provides an extension to printf, %m, which outputs
strerror(errno). It's a bit superfluous in my opinion, but some
projects make heavy use of it. Would newlib accept a patch to add this
feature?
Cheers,
Shaun
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