PWRITE(3PROC) Process Control Library Functions PWRITE(3PROC)
NAME
Pwrite - write data to the address space of a process
LIBRARY
Process Control Library (libproc, -lproc)
SYNOPSIS
#include <libproc.h> ssize_t Pwrite(
struct ps_prochandle *P,
const void *buf,
size_t nbyte,
uintptr_t address);
DESCRIPTION
The
Pwrite() function writes data from
buf to the process handle
P starting
at the address
address. It writes at most
nbyte of data. The
Pwrite()
function is logically analogous to the
pwrite(2) function.
For live processes, this function is equivalent to writing to the /proc
file system
as file for the process. For core files, it writes to the
logical address space of what was once the process and not the
corresponding offset in the on-disk file. ELF objects grabbed through
Pgrab_file(3PROC) do not support being written to.
The
Pwrite() function cannot be used to
extend the size of a mapping;
writing to an unmapped region generates an error.
RETURN VALUES
Upon successful completion, the
Pwrite() function returns the number of
bytes successfully written to
P. This number is never greater than
nbyte.
Otherwise, it returns
-1 and
errno is set to indicate an error. For the
full list of errors see the
DIAGNOSTICS section in
proc(5) and the
ERRORS section in
pwrite(2).
In addition, the
Pwrite() function will fail if:
EIO
P refers to an ELF object and not a core file or active
process.
INTERFACE STABILITY
UncommittedMT-LEVEL See
LOCKING in
libproc(3LIB).
SEE ALSO
pwrite(2),
libproc(3LIB),
proc(5)illumos May 11, 2016 illumos