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procfs.c
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/* Machine independent support for SVR4 /proc (process file system) for GDB.
Copyright (C) 1999-2015 Free Software Foundation, Inc.
Written by Michael Snyder at Cygnus Solutions.
Based on work by Fred Fish, Stu Grossman, Geoff Noer, and others.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "inferior.h"
#include "infrun.h"
#include "target.h"
#include "gdbcore.h"
#include "elf-bfd.h" /* for elfcore_write_* */
#include "gdbcmd.h"
#include "gdbthread.h"
#include "regcache.h"
#include "inf-child.h"
#include "filestuff.h"
#if defined (NEW_PROC_API)
#define _STRUCTURED_PROC 1 /* Should be done by configure script. */
#endif
#include <sys/procfs.h>
#ifdef HAVE_SYS_FAULT_H
#include <sys/fault.h>
#endif
#ifdef HAVE_SYS_SYSCALL_H
#include <sys/syscall.h>
#endif
#include "gdb_wait.h"
#include <signal.h>
#include <ctype.h>
#include "gdb_bfd.h"
#include "inflow.h"
#include "auxv.h"
#include "procfs.h"
#include "observer.h"
/* This module provides the interface between GDB and the
/proc file system, which is used on many versions of Unix
as a means for debuggers to control other processes.
Examples of the systems that use this interface are:
Irix
Solaris
OSF
AIX5
/proc works by imitating a file system: you open a simulated file
that represents the process you wish to interact with, and perform
operations on that "file" in order to examine or change the state
of the other process.
The most important thing to know about /proc and this module is
that there are two very different interfaces to /proc:
One that uses the ioctl system call, and another that uses read
and write system calls.
This module has to support both /proc interfaces. This means that
there are two different ways of doing every basic operation.
In order to keep most of the code simple and clean, I have defined
an interface "layer" which hides all these system calls. An ifdef
(NEW_PROC_API) determines which interface we are using, and most or
all occurrances of this ifdef should be confined to this interface
layer. */
/* Determine which /proc API we are using: The ioctl API defines
PIOCSTATUS, while the read/write (multiple fd) API never does. */
#ifdef NEW_PROC_API
#include <sys/types.h>
#include <dirent.h> /* opendir/readdir, for listing the LWP's */
#endif
#include <fcntl.h> /* for O_RDONLY */
#include <unistd.h> /* for "X_OK" */
#include <sys/stat.h> /* for struct stat */
/* Note: procfs-utils.h must be included after the above system header
files, because it redefines various system calls using macros.
This may be incompatible with the prototype declarations. */
#include "proc-utils.h"
/* Prototypes for supply_gregset etc. */
#include "gregset.h"
/* =================== TARGET_OPS "MODULE" =================== */
/* This module defines the GDB target vector and its methods. */
static void procfs_attach (struct target_ops *, const char *, int);
static void procfs_detach (struct target_ops *, const char *, int);
static void procfs_resume (struct target_ops *,
ptid_t, int, enum gdb_signal);
static void procfs_interrupt (struct target_ops *self, ptid_t);
static void procfs_files_info (struct target_ops *);
static void procfs_fetch_registers (struct target_ops *,
struct regcache *, int);
static void procfs_store_registers (struct target_ops *,
struct regcache *, int);
static void procfs_pass_signals (struct target_ops *self,
int, unsigned char *);
static void procfs_kill_inferior (struct target_ops *ops);
static void procfs_mourn_inferior (struct target_ops *ops);
static void procfs_create_inferior (struct target_ops *, char *,
char *, char **, int);
static ptid_t procfs_wait (struct target_ops *,
ptid_t, struct target_waitstatus *, int);
static enum target_xfer_status procfs_xfer_memory (gdb_byte *,
const gdb_byte *,
ULONGEST, ULONGEST,
ULONGEST *);
static target_xfer_partial_ftype procfs_xfer_partial;
static int procfs_thread_alive (struct target_ops *ops, ptid_t);
static void procfs_update_thread_list (struct target_ops *ops);
static char *procfs_pid_to_str (struct target_ops *, ptid_t);
static int proc_find_memory_regions (struct target_ops *self,
find_memory_region_ftype, void *);
static char * procfs_make_note_section (struct target_ops *self,
bfd *, int *);
static int procfs_can_use_hw_breakpoint (struct target_ops *self,
enum bptype, int, int);
static void procfs_info_proc (struct target_ops *, const char *,
enum info_proc_what);
#if defined (PR_MODEL_NATIVE) && (PR_MODEL_NATIVE == PR_MODEL_LP64)
/* When GDB is built as 64-bit application on Solaris, the auxv data
is presented in 64-bit format. We need to provide a custom parser
to handle that. */
static int
procfs_auxv_parse (struct target_ops *ops, gdb_byte **readptr,
gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp)
{
enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
gdb_byte *ptr = *readptr;
if (endptr == ptr)
return 0;
if (endptr - ptr < 8 * 2)
return -1;
*typep = extract_unsigned_integer (ptr, 4, byte_order);
ptr += 8;
/* The size of data is always 64-bit. If the application is 32-bit,
it will be zero extended, as expected. */
*valp = extract_unsigned_integer (ptr, 8, byte_order);
ptr += 8;
*readptr = ptr;
return 1;
}
#endif
struct target_ops *
procfs_target (void)
{
struct target_ops *t = inf_child_target ();
t->to_create_inferior = procfs_create_inferior;
t->to_kill = procfs_kill_inferior;
t->to_mourn_inferior = procfs_mourn_inferior;
t->to_attach = procfs_attach;
t->to_detach = procfs_detach;
t->to_wait = procfs_wait;
t->to_resume = procfs_resume;
t->to_fetch_registers = procfs_fetch_registers;
t->to_store_registers = procfs_store_registers;
t->to_xfer_partial = procfs_xfer_partial;
t->to_pass_signals = procfs_pass_signals;
t->to_files_info = procfs_files_info;
t->to_interrupt = procfs_interrupt;
t->to_update_thread_list = procfs_update_thread_list;
t->to_thread_alive = procfs_thread_alive;
t->to_pid_to_str = procfs_pid_to_str;
t->to_has_thread_control = tc_schedlock;
t->to_find_memory_regions = proc_find_memory_regions;
t->to_make_corefile_notes = procfs_make_note_section;
t->to_info_proc = procfs_info_proc;
#if defined(PR_MODEL_NATIVE) && (PR_MODEL_NATIVE == PR_MODEL_LP64)
t->to_auxv_parse = procfs_auxv_parse;
#endif
t->to_magic = OPS_MAGIC;
return t;
}
/* =================== END, TARGET_OPS "MODULE" =================== */
/* World Unification:
Put any typedefs, defines etc. here that are required for the
unification of code that handles different versions of /proc. */
#ifdef NEW_PROC_API /* Solaris 7 && 8 method for watchpoints */
#ifdef WA_READ
enum { READ_WATCHFLAG = WA_READ,
WRITE_WATCHFLAG = WA_WRITE,
EXEC_WATCHFLAG = WA_EXEC,
AFTER_WATCHFLAG = WA_TRAPAFTER
};
#endif
#else /* Irix method for watchpoints */
enum { READ_WATCHFLAG = MA_READ,
WRITE_WATCHFLAG = MA_WRITE,
EXEC_WATCHFLAG = MA_EXEC,
AFTER_WATCHFLAG = 0 /* trapafter not implemented */
};
#endif
/* gdb_sigset_t */
#ifdef HAVE_PR_SIGSET_T
typedef pr_sigset_t gdb_sigset_t;
#else
typedef sigset_t gdb_sigset_t;
#endif
/* sigaction */
#ifdef HAVE_PR_SIGACTION64_T
typedef pr_sigaction64_t gdb_sigaction_t;
#else
typedef struct sigaction gdb_sigaction_t;
#endif
/* siginfo */
#ifdef HAVE_PR_SIGINFO64_T
typedef pr_siginfo64_t gdb_siginfo_t;
#else
typedef siginfo_t gdb_siginfo_t;
#endif
/* On mips-irix, praddset and prdelset are defined in such a way that
they return a value, which causes GCC to emit a -Wunused error
because the returned value is not used. Prevent this warning
by casting the return value to void. On sparc-solaris, this issue
does not exist because the definition of these macros already include
that cast to void. */
#define gdb_praddset(sp, flag) ((void) praddset (sp, flag))
#define gdb_prdelset(sp, flag) ((void) prdelset (sp, flag))
/* gdb_premptysysset */
#ifdef premptysysset
#define gdb_premptysysset premptysysset
#else
#define gdb_premptysysset premptyset
#endif
/* praddsysset */
#ifdef praddsysset
#define gdb_praddsysset praddsysset
#else
#define gdb_praddsysset gdb_praddset
#endif
/* prdelsysset */
#ifdef prdelsysset
#define gdb_prdelsysset prdelsysset
#else
#define gdb_prdelsysset gdb_prdelset
#endif
/* prissyssetmember */
#ifdef prissyssetmember
#define gdb_pr_issyssetmember prissyssetmember
#else
#define gdb_pr_issyssetmember prismember
#endif
/* As a feature test, saying ``#if HAVE_PRSYSENT_T'' everywhere isn't
as intuitively descriptive as it could be, so we'll define
DYNAMIC_SYSCALLS to mean the same thing. Anyway, at the time of
this writing, this feature is only found on AIX5 systems and
basically means that the set of syscalls is not fixed. I.e,
there's no nice table that one can #include to get all of the
syscall numbers. Instead, they're stored in /proc/PID/sysent
for each process. We are at least guaranteed that they won't
change over the lifetime of the process. But each process could
(in theory) have different syscall numbers. */
#ifdef HAVE_PRSYSENT_T
#define DYNAMIC_SYSCALLS
#endif
/* =================== STRUCT PROCINFO "MODULE" =================== */
/* FIXME: this comment will soon be out of date W.R.T. threads. */
/* The procinfo struct is a wrapper to hold all the state information
concerning a /proc process. There should be exactly one procinfo
for each process, and since GDB currently can debug only one
process at a time, that means there should be only one procinfo.
All of the LWP's of a process can be accessed indirectly thru the
single process procinfo.
However, against the day when GDB may debug more than one process,
this data structure is kept in a list (which for now will hold no
more than one member), and many functions will have a pointer to a
procinfo as an argument.
There will be a separate procinfo structure for use by the (not yet
implemented) "info proc" command, so that we can print useful
information about any random process without interfering with the
inferior's procinfo information. */
#ifdef NEW_PROC_API
/* format strings for /proc paths */
# ifndef CTL_PROC_NAME_FMT
# define MAIN_PROC_NAME_FMT "/proc/%d"
# define CTL_PROC_NAME_FMT "/proc/%d/ctl"
# define AS_PROC_NAME_FMT "/proc/%d/as"
# define MAP_PROC_NAME_FMT "/proc/%d/map"
# define STATUS_PROC_NAME_FMT "/proc/%d/status"
# define MAX_PROC_NAME_SIZE sizeof("/proc/99999/lwp/8096/lstatus")
# endif
/* the name of the proc status struct depends on the implementation */
typedef pstatus_t gdb_prstatus_t;
typedef lwpstatus_t gdb_lwpstatus_t;
#else /* ! NEW_PROC_API */
/* format strings for /proc paths */
# ifndef CTL_PROC_NAME_FMT
# define MAIN_PROC_NAME_FMT "/proc/%05d"
# define CTL_PROC_NAME_FMT "/proc/%05d"
# define AS_PROC_NAME_FMT "/proc/%05d"
# define MAP_PROC_NAME_FMT "/proc/%05d"
# define STATUS_PROC_NAME_FMT "/proc/%05d"
# define MAX_PROC_NAME_SIZE sizeof("/proc/ttttppppp")
# endif
/* The name of the proc status struct depends on the implementation. */
typedef prstatus_t gdb_prstatus_t;
typedef prstatus_t gdb_lwpstatus_t;
#endif /* NEW_PROC_API */
typedef struct procinfo {
struct procinfo *next;
int pid; /* Process ID */
int tid; /* Thread/LWP id */
/* process state */
int was_stopped;
int ignore_next_sigstop;
/* The following four fd fields may be identical, or may contain
several different fd's, depending on the version of /proc
(old ioctl or new read/write). */
int ctl_fd; /* File descriptor for /proc control file */
/* The next three file descriptors are actually only needed in the
read/write, multiple-file-descriptor implemenation
(NEW_PROC_API). However, to avoid a bunch of #ifdefs in the
code, we will use them uniformly by (in the case of the ioctl
single-file-descriptor implementation) filling them with copies
of the control fd. */
int status_fd; /* File descriptor for /proc status file */
int as_fd; /* File descriptor for /proc as file */
char pathname[MAX_PROC_NAME_SIZE]; /* Pathname to /proc entry */
fltset_t saved_fltset; /* Saved traced hardware fault set */
gdb_sigset_t saved_sigset; /* Saved traced signal set */
gdb_sigset_t saved_sighold; /* Saved held signal set */
sysset_t *saved_exitset; /* Saved traced system call exit set */
sysset_t *saved_entryset; /* Saved traced system call entry set */
gdb_prstatus_t prstatus; /* Current process status info */
#ifndef NEW_PROC_API
gdb_fpregset_t fpregset; /* Current floating point registers */
#endif
#ifdef DYNAMIC_SYSCALLS
int num_syscalls; /* Total number of syscalls */
char **syscall_names; /* Syscall number to name map */
#endif
struct procinfo *thread_list;
int status_valid : 1;
int gregs_valid : 1;
int fpregs_valid : 1;
int threads_valid: 1;
} procinfo;
static char errmsg[128]; /* shared error msg buffer */
/* Function prototypes for procinfo module: */
static procinfo *find_procinfo_or_die (int pid, int tid);
static procinfo *find_procinfo (int pid, int tid);
static procinfo *create_procinfo (int pid, int tid);
static void destroy_procinfo (procinfo * p);
static void do_destroy_procinfo_cleanup (void *);
static void dead_procinfo (procinfo * p, char *msg, int killp);
static int open_procinfo_files (procinfo * p, int which);
static void close_procinfo_files (procinfo * p);
static int sysset_t_size (procinfo *p);
static sysset_t *sysset_t_alloc (procinfo * pi);
#ifdef DYNAMIC_SYSCALLS
static void load_syscalls (procinfo *pi);
static void free_syscalls (procinfo *pi);
static int find_syscall (procinfo *pi, char *name);
#endif /* DYNAMIC_SYSCALLS */
static int iterate_over_mappings
(procinfo *pi, find_memory_region_ftype child_func, void *data,
int (*func) (struct prmap *map, find_memory_region_ftype child_func,
void *data));
/* The head of the procinfo list: */
static procinfo * procinfo_list;
/* Search the procinfo list. Return a pointer to procinfo, or NULL if
not found. */
static procinfo *
find_procinfo (int pid, int tid)
{
procinfo *pi;
for (pi = procinfo_list; pi; pi = pi->next)
if (pi->pid == pid)
break;
if (pi)
if (tid)
{
/* Don't check threads_valid. If we're updating the
thread_list, we want to find whatever threads are already
here. This means that in general it is the caller's
responsibility to check threads_valid and update before
calling find_procinfo, if the caller wants to find a new
thread. */
for (pi = pi->thread_list; pi; pi = pi->next)
if (pi->tid == tid)
break;
}
return pi;
}
/* Calls find_procinfo, but errors on failure. */
static procinfo *
find_procinfo_or_die (int pid, int tid)
{
procinfo *pi = find_procinfo (pid, tid);
if (pi == NULL)
{
if (tid)
error (_("procfs: couldn't find pid %d "
"(kernel thread %d) in procinfo list."),
pid, tid);
else
error (_("procfs: couldn't find pid %d in procinfo list."), pid);
}
return pi;
}
/* Wrapper for `open'. The appropriate open call is attempted; if
unsuccessful, it will be retried as many times as needed for the
EAGAIN and EINTR conditions.
For other conditions, retry the open a limited number of times. In
addition, a short sleep is imposed prior to retrying the open. The
reason for this sleep is to give the kernel a chance to catch up
and create the file in question in the event that GDB "wins" the
race to open a file before the kernel has created it. */
static int
open_with_retry (const char *pathname, int flags)
{
int retries_remaining, status;
retries_remaining = 2;
while (1)
{
status = open (pathname, flags);
if (status >= 0 || retries_remaining == 0)
break;
else if (errno != EINTR && errno != EAGAIN)
{
retries_remaining--;
sleep (1);
}
}
return status;
}
/* Open the file descriptor for the process or LWP. If NEW_PROC_API
is defined, we only open the control file descriptor; the others
are opened lazily as needed. Otherwise (if not NEW_PROC_API),
there is only one real file descriptor, but we keep multiple copies
of it so that the code that uses them does not have to be #ifdef'd.
Returns the file descriptor, or zero for failure. */
enum { FD_CTL, FD_STATUS, FD_AS };
static int
open_procinfo_files (procinfo *pi, int which)
{
#ifdef NEW_PROC_API
char tmp[MAX_PROC_NAME_SIZE];
#endif
int fd;
/* This function is getting ALMOST long enough to break up into
several. Here is some rationale:
NEW_PROC_API (Solaris 2.6, Solaris 2.7):
There are several file descriptors that may need to be open
for any given process or LWP. The ones we're intereted in are:
- control (ctl) write-only change the state
- status (status) read-only query the state
- address space (as) read/write access memory
- map (map) read-only virtual addr map
Most of these are opened lazily as they are needed.
The pathnames for the 'files' for an LWP look slightly
different from those of a first-class process:
Pathnames for a process (<proc-id>):
/proc/<proc-id>/ctl
/proc/<proc-id>/status
/proc/<proc-id>/as
/proc/<proc-id>/map
Pathnames for an LWP (lwp-id):
/proc/<proc-id>/lwp/<lwp-id>/lwpctl
/proc/<proc-id>/lwp/<lwp-id>/lwpstatus
An LWP has no map or address space file descriptor, since
the memory map and address space are shared by all LWPs.
Everyone else (Solaris 2.5, Irix, OSF)
There is only one file descriptor for each process or LWP.
For convenience, we copy the same file descriptor into all
three fields of the procinfo struct (ctl_fd, status_fd, and
as_fd, see NEW_PROC_API above) so that code that uses them
doesn't need any #ifdef's.
Pathname for all:
/proc/<proc-id>
Solaris 2.5 LWP's:
Each LWP has an independent file descriptor, but these
are not obtained via the 'open' system call like the rest:
instead, they're obtained thru an ioctl call (PIOCOPENLWP)
to the file descriptor of the parent process.
OSF threads:
These do not even have their own independent file descriptor.
All operations are carried out on the file descriptor of the
parent process. Therefore we just call open again for each
thread, getting a new handle for the same 'file'. */
#ifdef NEW_PROC_API
/* In this case, there are several different file descriptors that
we might be asked to open. The control file descriptor will be
opened early, but the others will be opened lazily as they are
needed. */
strcpy (tmp, pi->pathname);
switch (which) { /* Which file descriptor to open? */
case FD_CTL:
if (pi->tid)
strcat (tmp, "/lwpctl");
else
strcat (tmp, "/ctl");
fd = open_with_retry (tmp, O_WRONLY);
if (fd < 0)
return 0; /* fail */
pi->ctl_fd = fd;
break;
case FD_AS:
if (pi->tid)
return 0; /* There is no 'as' file descriptor for an lwp. */
strcat (tmp, "/as");
fd = open_with_retry (tmp, O_RDWR);
if (fd < 0)
return 0; /* fail */
pi->as_fd = fd;
break;
case FD_STATUS:
if (pi->tid)
strcat (tmp, "/lwpstatus");
else
strcat (tmp, "/status");
fd = open_with_retry (tmp, O_RDONLY);
if (fd < 0)
return 0; /* fail */
pi->status_fd = fd;
break;
default:
return 0; /* unknown file descriptor */
}
#else /* not NEW_PROC_API */
/* In this case, there is only one file descriptor for each procinfo
(ie. each process or LWP). In fact, only the file descriptor for
the process can actually be opened by an 'open' system call. The
ones for the LWPs have to be obtained thru an IOCTL call on the
process's file descriptor.
For convenience, we copy each procinfo's single file descriptor
into all of the fields occupied by the several file descriptors
of the NEW_PROC_API implementation. That way, the code that uses
them can be written without ifdefs. */
#ifdef PIOCTSTATUS /* OSF */
/* Only one FD; just open it. */
if ((fd = open_with_retry (pi->pathname, O_RDWR)) < 0)
return 0;
#else /* Sol 2.5, Irix, other? */
if (pi->tid == 0) /* Master procinfo for the process */
{
fd = open_with_retry (pi->pathname, O_RDWR);
if (fd < 0)
return 0; /* fail */
}
else /* LWP thread procinfo */
{
#ifdef PIOCOPENLWP /* Sol 2.5, thread/LWP */
procinfo *process;
int lwpid = pi->tid;
/* Find the procinfo for the entire process. */
if ((process = find_procinfo (pi->pid, 0)) == NULL)
return 0; /* fail */
/* Now obtain the file descriptor for the LWP. */
if ((fd = ioctl (process->ctl_fd, PIOCOPENLWP, &lwpid)) < 0)
return 0; /* fail */
#else /* Irix, other? */
return 0; /* Don't know how to open threads. */
#endif /* Sol 2.5 PIOCOPENLWP */
}
#endif /* OSF PIOCTSTATUS */
pi->ctl_fd = pi->as_fd = pi->status_fd = fd;
#endif /* NEW_PROC_API */
return 1; /* success */
}
/* Allocate a data structure and link it into the procinfo list.
First tries to find a pre-existing one (FIXME: why?). Returns the
pointer to new procinfo struct. */
static procinfo *
create_procinfo (int pid, int tid)
{
procinfo *pi, *parent = NULL;
if ((pi = find_procinfo (pid, tid)))
return pi; /* Already exists, nothing to do. */
/* Find parent before doing malloc, to save having to cleanup. */
if (tid != 0)
parent = find_procinfo_or_die (pid, 0); /* FIXME: should I
create it if it
doesn't exist yet? */
pi = XNEW (procinfo);
memset (pi, 0, sizeof (procinfo));
pi->pid = pid;
pi->tid = tid;
#ifdef DYNAMIC_SYSCALLS
load_syscalls (pi);
#endif
pi->saved_entryset = sysset_t_alloc (pi);
pi->saved_exitset = sysset_t_alloc (pi);
/* Chain into list. */
if (tid == 0)
{
sprintf (pi->pathname, MAIN_PROC_NAME_FMT, pid);
pi->next = procinfo_list;
procinfo_list = pi;
}
else
{
#ifdef NEW_PROC_API
sprintf (pi->pathname, "/proc/%05d/lwp/%d", pid, tid);
#else
sprintf (pi->pathname, MAIN_PROC_NAME_FMT, pid);
#endif
pi->next = parent->thread_list;
parent->thread_list = pi;
}
return pi;
}
/* Close all file descriptors associated with the procinfo. */
static void
close_procinfo_files (procinfo *pi)
{
if (pi->ctl_fd > 0)
close (pi->ctl_fd);
#ifdef NEW_PROC_API
if (pi->as_fd > 0)
close (pi->as_fd);
if (pi->status_fd > 0)
close (pi->status_fd);
#endif
pi->ctl_fd = pi->as_fd = pi->status_fd = 0;
}
/* Destructor function. Close, unlink and deallocate the object. */
static void
destroy_one_procinfo (procinfo **list, procinfo *pi)
{
procinfo *ptr;
/* Step one: unlink the procinfo from its list. */
if (pi == *list)
*list = pi->next;
else
for (ptr = *list; ptr; ptr = ptr->next)
if (ptr->next == pi)
{
ptr->next = pi->next;
break;
}
/* Step two: close any open file descriptors. */
close_procinfo_files (pi);
/* Step three: free the memory. */
#ifdef DYNAMIC_SYSCALLS
free_syscalls (pi);
#endif
xfree (pi->saved_entryset);
xfree (pi->saved_exitset);
xfree (pi);
}
static void
destroy_procinfo (procinfo *pi)
{
procinfo *tmp;
if (pi->tid != 0) /* Destroy a thread procinfo. */
{
tmp = find_procinfo (pi->pid, 0); /* Find the parent process. */
destroy_one_procinfo (&tmp->thread_list, pi);
}
else /* Destroy a process procinfo and all its threads. */
{
/* First destroy the children, if any; */
while (pi->thread_list != NULL)
destroy_one_procinfo (&pi->thread_list, pi->thread_list);
/* Then destroy the parent. Genocide!!! */
destroy_one_procinfo (&procinfo_list, pi);
}
}
static void
do_destroy_procinfo_cleanup (void *pi)
{
destroy_procinfo (pi);
}
enum { NOKILL, KILL };
/* To be called on a non_recoverable error for a procinfo. Prints
error messages, optionally sends a SIGKILL to the process, then
destroys the data structure. */
static void
dead_procinfo (procinfo *pi, char *msg, int kill_p)
{
char procfile[80];
if (pi->pathname)
{
print_sys_errmsg (pi->pathname, errno);
}
else
{
sprintf (procfile, "process %d", pi->pid);
print_sys_errmsg (procfile, errno);
}
if (kill_p == KILL)
kill (pi->pid, SIGKILL);
destroy_procinfo (pi);
error ("%s", msg);
}
/* Returns the (complete) size of a sysset_t struct. Normally, this
is just sizeof (sysset_t), but in the case of Monterey/64, the
actual size of sysset_t isn't known until runtime. */
static int
sysset_t_size (procinfo * pi)
{
#ifndef DYNAMIC_SYSCALLS
return sizeof (sysset_t);
#else
return sizeof (sysset_t) - sizeof (uint64_t)
+ sizeof (uint64_t) * ((pi->num_syscalls + (8 * sizeof (uint64_t) - 1))
/ (8 * sizeof (uint64_t)));
#endif
}
/* Allocate and (partially) initialize a sysset_t struct. */
static sysset_t *
sysset_t_alloc (procinfo * pi)
{
sysset_t *ret;
int size = sysset_t_size (pi);
ret = xmalloc (size);
#ifdef DYNAMIC_SYSCALLS
ret->pr_size = ((pi->num_syscalls + (8 * sizeof (uint64_t) - 1))
/ (8 * sizeof (uint64_t)));
#endif
return ret;
}
#ifdef DYNAMIC_SYSCALLS
/* Extract syscall numbers and names from /proc/<pid>/sysent. Initialize
pi->num_syscalls with the number of syscalls and pi->syscall_names
with the names. (Certain numbers may be skipped in which case the
names for these numbers will be left as NULL.) */
#define MAX_SYSCALL_NAME_LENGTH 256
#define MAX_SYSCALLS 65536
static void
load_syscalls (procinfo *pi)
{
char pathname[MAX_PROC_NAME_SIZE];
int sysent_fd;
prsysent_t header;
prsyscall_t *syscalls;
int i, size, maxcall;
struct cleanup *cleanups;
pi->num_syscalls = 0;
pi->syscall_names = 0;
/* Open the file descriptor for the sysent file. */
sprintf (pathname, "/proc/%d/sysent", pi->pid);
sysent_fd = open_with_retry (pathname, O_RDONLY);
if (sysent_fd < 0)
{
error (_("load_syscalls: Can't open /proc/%d/sysent"), pi->pid);
}
cleanups = make_cleanup_close (sysent_fd);
size = sizeof header - sizeof (prsyscall_t);
if (read (sysent_fd, &header, size) != size)
{
error (_("load_syscalls: Error reading /proc/%d/sysent"), pi->pid);
}
if (header.pr_nsyscalls == 0)
{
error (_("load_syscalls: /proc/%d/sysent contains no syscalls!"),
pi->pid);
}
size = header.pr_nsyscalls * sizeof (prsyscall_t);
syscalls = xmalloc (size);
make_cleanup (free_current_contents, &syscalls);
if (read (sysent_fd, syscalls, size) != size)
error (_("load_syscalls: Error reading /proc/%d/sysent"), pi->pid);
/* Find maximum syscall number. This may not be the same as
pr_nsyscalls since that value refers to the number of entries
in the table. (Also, the docs indicate that some system
call numbers may be skipped.) */
maxcall = syscalls[0].pr_number;
for (i = 1; i < header.pr_nsyscalls; i++)
if (syscalls[i].pr_number > maxcall
&& syscalls[i].pr_nameoff > 0
&& syscalls[i].pr_number < MAX_SYSCALLS)
maxcall = syscalls[i].pr_number;
pi->num_syscalls = maxcall+1;
pi->syscall_names = XNEWVEC (char *, pi->num_syscalls);
for (i = 0; i < pi->num_syscalls; i++)
pi->syscall_names[i] = NULL;
/* Read the syscall names in. */
for (i = 0; i < header.pr_nsyscalls; i++)
{
char namebuf[MAX_SYSCALL_NAME_LENGTH];
int nread;
int callnum;
if (syscalls[i].pr_number >= MAX_SYSCALLS
|| syscalls[i].pr_number < 0
|| syscalls[i].pr_nameoff <= 0
|| (lseek (sysent_fd, (off_t) syscalls[i].pr_nameoff, SEEK_SET)
!= (off_t) syscalls[i].pr_nameoff))
continue;
nread = read (sysent_fd, namebuf, sizeof namebuf);
if (nread <= 0)
continue;
callnum = syscalls[i].pr_number;
if (pi->syscall_names[callnum] != NULL)
{
/* FIXME: Generate warning. */
continue;
}
namebuf[nread-1] = '\0';
size = strlen (namebuf) + 1;
pi->syscall_names[callnum] = xmalloc (size);
strncpy (pi->syscall_names[callnum], namebuf, size-1);
pi->syscall_names[callnum][size-1] = '\0';
}
do_cleanups (cleanups);
}
/* Free the space allocated for the syscall names from the procinfo
structure. */
static void
free_syscalls (procinfo *pi)
{
if (pi->syscall_names)
{
int i;
for (i = 0; i < pi->num_syscalls; i++)
if (pi->syscall_names[i] != NULL)
xfree (pi->syscall_names[i]);
xfree (pi->syscall_names);
pi->syscall_names = 0;
}
}
/* Given a name, look up (and return) the corresponding syscall number.
If no match is found, return -1. */
static int
find_syscall (procinfo *pi, char *name)
{
int i;
for (i = 0; i < pi->num_syscalls; i++)
{
if (pi->syscall_names[i] && strcmp (name, pi->syscall_names[i]) == 0)
return i;
}
return -1;
}
#endif
/* =================== END, STRUCT PROCINFO "MODULE" =================== */
/* =================== /proc "MODULE" =================== */