Re: printf....!
On 2003-02-08 16:23, David Leimbach <[EMAIL PROTECTED]> wrote: > Dave > On Saturday, February 8, 2003, at 04:12 PM, Auge Mike wrote: > >Hi all, > > > >I was trying to know how "printf" works in FreeBSD... I hvae > >reached to this point : > > > >#define _write(fd, s, n) \ > > __syscall(SYS_write, (int)(fd), (const void *)(s), (size_t)(n)) > > Isn't it ultimately interrupt 08 on the PC with an index in the EAX > register for the write "subroutine"? Interrupt 0x80. > I am pretty sure that's correct. I might have the interrupt value > wrong though. - Giorgos To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
Re: printf....!
On Saturday 08 February 2003 22:12, Auge Mike wrote: > Hi all, > > I was trying to know how "printf" works in FreeBSD... I hvae reached to > this point : > > #define _write(fd, s, n) \ > __syscall(SYS_write, (int)(fd), (const void *)(s), (size_t)(n)) > > I'am not really familiar with the way FreeBSD handle interrupts. I like > from any one of you to tell me what functions will be called next and in > which files, till we get the string of the printf function argment > displayed in the terminal. This is the syscall (kernel entry) that implements the write(2) kernel function. Then next function will be in kernel space, and will be the handler for SYS_write, the 'write' function in sys/kern/sys_generic.c. By "handles interrupts" I assume you meant the syscall interface, right? -- Where am I, and what am I doing in this handbasket? Wes Peters [EMAIL PROTECTED] To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
Re: printf....!
"Auge Mike" <[EMAIL PROTECTED]>: > I was trying to know how "printf" works in FreeBSD... I hvae reached > to this point : > > #define _write(fd, s, n) \ > __syscall(SYS_write, (int)(fd), (const void *)(s), (size_t)(n)) if your program runs in user-space, try strace(1) or ktrace(1). clemens To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
Re: printf....!
>I was trying to know how "printf" works in FreeBSD... I hvae reached >to this >point : > >#define _write(fd, s, n) \ > __syscall(SYS_write, (int)(fd), (const void *)(s), (size_t)(n)) > >I'am not really familiar with the way FreeBSD handle interrupts. I >like from >any one of you to tell me what functions will be called next and in >which >files, till we get the string of the printf function argment displayed >in >the terminal. Look in /usr/src/sys/kern/syscalls.master. You will see that this write() is listed as a system call. If you run the script makesyscalls.sh which is in the same directory, it will create syscalls.c, syscalls.h, sysproto.h, and syscall.mk. If you look at /usr/src/sys/sys/syscall.h, you will see SYS_write defined in that file. You can see the man page for syscall() to see what it does when you do syscall(SYS_write, ...); Look in /usr/src/sys/kern/sys_generic.c, and look at the write() function there. I'm not familiar with DOS interrupts, but hopefully that will give you more clues:) You should also look at the Developer's Handbook: http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/ -- Craig Rodrigues http://home.attbi.com/~rodrigc [EMAIL PROTECTED] To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
Re: printf....!
On Sat, 8 Feb 2003 16:23:21 -0600 David Leimbach <[EMAIL PROTECTED]> wrote: Howdy. > Isn't it ultimately interrupt 08 on the PC with an index in the EAX > register for the write "subroutine"? > > I am pretty sure that's correct. I might have the interrupt value > wrong though. s/08/0x80/ :-) Cheers, -- Miguel Mendez - [EMAIL PROTECTED] GPG Public Key :: http://energyhq.homeip.net/files/pubkey.txt EnergyHQ :: http://www.energyhq.tk Of course it runs NetBSD! msg52019/pgp0.pgp Description: PGP signature
Re: printf....!
Isn't it ultimately interrupt 08 on the PC with an index in the EAX register for the write "subroutine"? I am pretty sure that's correct. I might have the interrupt value wrong though. Dave On Saturday, February 8, 2003, at 04:12 PM, Auge Mike wrote: Hi all, I was trying to know how "printf" works in FreeBSD... I hvae reached to this point : #define _write(fd, s, n) \ __syscall(SYS_write, (int)(fd), (const void *)(s), (size_t)(n)) I'am not really familiar with the way FreeBSD handle interrupts. I like from any one of you to tell me what functions will be called next and in which files, till we get the string of the printf function argment displayed in the terminal. Yours, _ The new MSN 8: advanced junk mail protection and 2 months FREE* http://join.msn.com/?page=features/junkmail To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
