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FreeBSD 11.0 - man page for i386_set_watch (freebsd section 3)

I386_SET_WATCH(3)					   BSD Library Functions Manual 					 I386_SET_WATCH(3)

i386_clr_watch, i386_set_watch -- manage i386 debug register values
Standard C Library (libc, -lc)
#include <machine/reg.h> #include <machine/sysarch.h> int i386_clr_watch(int watchnum, struct dbreg *d); int i386_set_watch(int watchnum, unsigned int watchaddr, int size, int access, struct dbreg *d);
The i386_clr_watch() function will disable the indicated watch point within the specified debug register set. The i386_set_watch() function will set up the specified debug registers as indicated by the arguments. The watchnum argument specifies which watch register is used, 0, 1, 2, 3, or -1. If watchnum is -1, a free watch register is found and used. If there are no free watch regis- ters, an error code of -1 is returned. The watchaddr argument specifies the watch address, size specifies the size in bytes of the area to be watched (1, 2, or 4 bytes), and access specifies the type of watch point: DBREG_DR7_EXEC An execution breakpoint. DBREG_DR7_WRONLY Break only when the watch area is written to. DBREG_DR7_RDWR Break when the watch area is read from or written to. Note that these functions do not actually set or clear breakpoints; they manipulate the indicated debug register set. You must use ptrace(2) to retrieve and install the debug register values for a process.
On success, the i386_clr_watch() function returns 0. On error, -1 returned which indicates that watchnum is invalid (not in the range of 0-3). If the specified watchnum was already disabled, no error is returned. On success, the i386_set_watch() function returns the watchnum argument, or the watchnum actually used in the case where the specified watchnum was -1. On error, the i386_set_watch() function returns -1 indicating that the watchpoint could not established because either no more watchpoints are available, or watchnum, size, or access is invalid.
ptrace(2), procfs(5)
This man page was written by Brian S. Dean.
August 24, 2000 BSD

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