sudo find / -name "signal.h" | xargs grep -in "SIGHUP"
在ubuntu24.04用上面的命令搜索，
可以得到如下的结果：
wan@ubuntu:~$ sudo find / -name "signal.h" | xargs grep -in "SIGHUP" /usr/src/linux-headers-6.8.0-79/include/linux/signal.h:355: * | SIGHUP | terminate | /usr/src/linux-headers-6.8.0-79/include/uapi/asm-generic/signal.h:11:#define SIGHUP 1 /usr/src/linux-headers-6.8.0-79/arch/xtensa/include/uapi/asm/signal.h:35:#define SIGHUP 1 /usr/src/linux-headers-6.8.0-79/arch/sparc/include/uapi/asm/signal.h:12:#define SIGHUP 1 /usr/src/linux-headers-6.8.0-79/arch/arm/include/uapi/asm/signal.h:18:#define SIGHUP 1 /usr/src/linux-headers-6.8.0-79/arch/s390/include/uapi/asm/signal.h:26:#define SIGHUP 1 /usr/src/linux-headers-6.8.0-79/arch/m68k/include/uapi/asm/signal.h:18:#define SIGHUP 1 /usr/src/linux-headers-6.8.0-79/arch/alpha/include/uapi/asm/signal.h:23:#define SIGHUP 1 /usr/src/linux-headers-6.8.0-79/arch/parisc/include/uapi/asm/signal.h:5:#define SIGHUP 1 /usr/src/linux-headers-6.8.0-79/arch/mips/include/uapi/asm/signal.h:25:#define SIGHUP 1 /* Hangup (POSIX). */ /usr/src/linux-headers-6.8.0-79/arch/powerpc/include/uapi/asm/signal.h:21:#define SIGHUP 1 /usr/src/linux-headers-6.8.0-79/arch/x86/include/uapi/asm/signal.h:22:#define SIGHUP 1 /usr/include/asm-generic/signal.h:11:#define SIGHUP 1 /usr/include/x86_64-linux-gnu/asm/signal.h:20:#define SIGHUP