Wow, that was it. I'm happy to hear that because I thought it should end up
with a system call anyway.
Then isn't there some codes making the system call? Or is it that the compiler
understands that 'write' is a system call and inserts the assembly code for
calling it by itself?
Thanks in adv.
Chan
________________________________
From : "Mohan L" <[email protected]>
Sent : 2014-03-12 15:31:24 ( +09:00 )
To : Kim Chan <[email protected]>
Cc : Dave Hylands <[email protected]>, [email protected]
<[email protected]>
Subject : Re: where is the printf source for busybox?
ssize_t attribute_hidden _cs_write(void *cookie, const char *buf, size_t
bufsize)
{
return write(*((int *) cookie), (char *) buf, bufsize);
}
what does cs stand for here? (Hm.. seems like custom streams..in the code) and
I couldn't follow past write above. Where is the function write defined?
Hi Chan,
write is a system call.
$ man 2 write
syscall table for x86 architecture can be found in :
<path>/arch/x86/syscalls/syscall_32.tbl
# cat <path>/arch/x86/syscalls/syscall_32.tbl | grep 'write'
4 i386 write sys_write
The format is:
<number> <abi> <name> <entry point> <compat entry point>
search sys_write definition in kernel source.
Thanks
Mohan L
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