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Document PT_IO, and move the comment about machine-dependent requests

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below PT_[GS]ET_{,DB,FP}REGS.
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des 2002-03-16 03:50:32 +00:00
parent f073aa5305
commit f38c8672a3
1 changed files with 33 additions and 5 deletions
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38
lib/libc/sys/ptrace.2
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@ -102,6 +102,37 @@ except that they write rather than read.
The
.Fa data
argument supplies the value to be written.
.It Dv PT_IO
This request allows reading and writing arbitrary amounts of data in
the traced process's address space.
The
.Fa addr
argument specifies a pointer to a
.Vt struct ptrace_io_desc ,
which is defined as follows:
.Bd -literal
struct ptrace_io_desc {
int piod_op; /* I/O operation */
void *piod_offs; /* child offset */
void *piod_addr; /* parent offset */
size_t piod_len; /* request length */
};
/*
* Operations in piod_op.
*/
#define PIOD_READ_D 1 /* Read from D space */
#define PIOD_WRITE_D 2 /* Write to D space */
#define PIOD_READ_I 3 /* Read from I space */
#define PIOD_WRITE_I 4 /* Write to I space */
.Ed
.Pp
The
.Fa data
argument is ignored.
The actual number of bytes read or written is stored in
.Va piod_len
upon return.
.It Dv PT_CONTINUE
The traced process continues execution.
.Fa addr
@ -146,11 +177,6 @@ This request is like PT_CONTINUE, except that it does not allow
specifying an alternate place to continue execution, and after it
succeeds, the traced process is no longer traced and continues
execution normally.
.El
.Pp
Additionally, machine-specific requests can exist.
On the i386, these are:
.Bl -tag -width 12n
.It Dv PT_GETREGS
This request reads the traced process's machine registers into the
.Do
@ -214,6 +240,8 @@ it loads the traced process's debug registers from the
pointed to by
.Fa addr .
.El
.Pp
Additionally, machine-specific requests can exist.
.Sh RETURN VALUES
Some requests can cause
.Fn ptrace