Hi, I've had this question for some time past and I would like to know the answer now.. I wanted to follow a printf in busybox but couldn't find the source of the printf function. Then I throught probably the printf is provided by the system library where printf is connected to proper linux system call. (Is it printk?) So I checkd LD_LIBRARY_PATH of my shell and found libc.so under /lib. I could see by 'nm libc.so' that printf is in the library. But where can I see the printf source? Is it under gcc source? in GNU sdk, under glibc-2.16.0, I tried # grep 'int printf(' * -r but nothing comes up. In linux kernel source doing the same gaves me arch/x86/boot/boot.h:int printf(const char *fmt, ...); arch/x86/boot/printf.c:int printf(const char *fmt, ...) arch/um/include/shared/kern.h:extern int printf(const char *fmt, ...); arch/um/os-Linux/user_syms.c:extern int printf(const char *, ...); arch/powerpc/boot/stdio.h:extern int printf(const char *fmt, ...) __attribute__((format(printf, 1, 2))); so printf is defined only for x86 architecture? I understand printf is for user program not kernel, so I want to see how the printf is connected to kernel print function. (the system call, I know in sparc, linux system call is trap 0x90, function 59 when using assembly) Where can I find the printf (user program) source? Thanks in advance. Chan
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