libproc.h

/*
 * Copyright (c) 2002, 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

/*
 * Interfaces available from the process control library, libproc.
 *
 * libproc provides process control functions for the /proc tools
 * (commands in /usr/proc/bin), /usr/bin/truss, and /usr/bin/gcore.
 * libproc is a private support library for these commands only.
 * It is _not_ a public interface, although it might become one
 * in the fullness of time, when the interfaces settle down.
 *
 * In the meantime, be aware that any program linked with libproc in this
 * release of Solaris is almost guaranteed to break in the next release.
 *
 * In short, do not use this header file or libproc for any purpose.
 */

#ifndef _LIBPROC_H
#define _LIBPROC_H

#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <nlist.h>
#include <door.h>
#include <gelf.h>
#include <proc_service.h>
#include <rtld_db.h>
#include <procfs.h>
#include <sys/stat.h>
#include <sys/statvfs.h>
#include <sys/auxv.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/utsname.h>

#ifdef  __cplusplus
extern "C" {
#endif

/*
 * Opaque structure tag reference to a process control structure.
 * Clients of libproc cannot look inside the process control structure.
 * The implementation of struct ps_prochandle can change w/o affecting clients.
 */
struct ps_prochandle;

extern  int     _libproc_debug; /* set non-zero to enable debugging fprintfs */

#if defined(sparc) || defined(__sparc)
#define R_RVAL1 R_O0            /* register holding a function return value */
#define R_RVAL2 R_O1            /* 32 more bits for a 64-bit return value */
#define SYSCALL32 0x91d02008    /* 32-bit syscall (ta 8) instruction */
#define SYSCALL64 0x91d02040    /* 64-bit syscall (ta 64) instruction */
typedef uint32_t syscall_t;     /* holds a syscall instruction */
#endif  /* sparc */

#if defined(__i386) || defined(__ia64)
#define R_PC    EIP
#define R_SP    UESP
#define R_RVAL1 EAX             /* register holding a function return value */
#define R_RVAL2 EDX             /* 32 more bits for a 64-bit return value */
#define SYSCALL 0x9a            /* syscall (lcall) instruction opcode */
typedef uchar_t syscall_t[7];   /* holds a syscall instruction */
#endif  /* __i386 || __ia64 */

#define R_RVAL  R_RVAL1         /* simple function return value register */

/* maximum sizes of things */
#define PRMAXSIG        (32 * sizeof (sigset_t) / sizeof (uint32_t))
#define PRMAXFAULT      (32 * sizeof (fltset_t) / sizeof (uint32_t))
#define PRMAXSYS        (32 * sizeof (sysset_t) / sizeof (uint32_t))

/* State values returned by Pstate() */
#define PS_RUN          1       /* process is running */
#define PS_STOP         2       /* process is stopped */
#define PS_LOST         3       /* process is lost to control (EAGAIN) */
#define PS_UNDEAD       4       /* process is terminated (zombie) */
#define PS_DEAD         5       /* process is terminated (core file) */

/* Flags accepted by Pgrab() */
#define PGRAB_RETAIN    0x01    /* Retain tracing flags, else clear flags */
#define PGRAB_FORCE     0x02    /* Open the process w/o O_EXCL */
#define PGRAB_RDONLY    0x04    /* Open the process or core w/ O_RDONLY */
#define PGRAB_NOSTOP    0x08    /* Open the process but do not stop it */

/* Error codes from Pcreate() */
#define C_STRANGE       -1      /* Unanticipated error, errno is meaningful */
#define C_FORK          1       /* Unable to fork */
#define C_PERM          2       /* No permission (file set-id or unreadable) */
#define C_NOEXEC        3       /* Cannot find executable file */
#define C_INTR          4       /* Interrupt received while creating */
#define C_LP64          5       /* Program is _LP64, self is _ILP32 */

/* Error codes from Pgrab(), Pfgrab_core(), and Pgrab_core() */
#define G_STRANGE       -1      /* Unanticipated error, errno is meaningful */
#define G_NOPROC        1       /* No such process */
#define G_NOCORE        2       /* No such core file */
#define G_NOPROCORCORE  3       /* No such proc or core (for proc_arg_grab) */
#define G_NOEXEC        4       /* Cannot locate executable file */
#define G_ZOMB          5       /* Zombie process */
#define G_PERM          6       /* No permission */
#define G_BUSY          7       /* Another process has control */
#define G_SYS           8       /* System process */
#define G_SELF          9       /* Process is self */
#define G_INTR          10      /* Interrupt received while grabbing */
#define G_LP64          11      /* Process is _LP64, self is ILP32 */
#define G_FORMAT        12      /* File is not an ELF format core file */
#define G_ELF           13      /* Libelf error, elf_errno() is meaningful */
#define G_NOTE          14      /* Required PT_NOTE Phdr not present in core */

/* Flags accepted by Prelease */
#define PRELEASE_CLEAR  0x10    /* Clear all tracing flags */
#define PRELEASE_RETAIN 0x20    /* Retain final tracing flags */
#define PRELEASE_HANG   0x40    /* Leave the process stopped */
#define PRELEASE_KILL   0x80    /* Terminate the process */

typedef struct {        /* argument descriptor for system call (Psyscall) */
        long    arg_value;      /* value of argument given to system call */
        void    *arg_object;    /* pointer to object in controlling process */
        char    arg_type;       /* AT_BYVAL, AT_BYREF */
        char    arg_inout;      /* AI_INPUT, AI_OUTPUT, AI_INOUT */
        ushort_t arg_size;      /* if AT_BYREF, size of object in bytes */
} argdes_t;

typedef struct {        /* return values from system call (Psyscall) */
        int     sys_errno;      /* syscall error number */
        long    sys_rval1;      /* primary return value from system call */
        long    sys_rval2;      /* second return value from system call */
} sysret_t;

/* values for type */
#define AT_BYVAL        1
#define AT_BYREF        2

/* values for inout */
#define AI_INPUT        1
#define AI_OUTPUT       2
#define AI_INOUT        3

/* maximum number of syscall arguments */
#define MAXARGS         8

/* maximum size in bytes of a BYREF argument */
#define MAXARGL         (4*1024)

/* Kludges to make things work on Solaris 2.6 */
#if !defined(_LP64) && !defined(PR_MODEL_UNKNOWN)
#define PR_MODEL_UNKNOWN 0
#define PR_MODEL_ILP32  0       /* process data model is ILP32 */
#define PR_MODEL_LP64   2       /* process data model is LP64 */
#define PR_MODEL_NATIVE PR_MODEL_ILP32
#define pr_dmodel       pr_filler[0]
#define STACK_BIAS      0
#endif

/*
 * Function prototypes for routines in the process control package.
 */
extern struct ps_prochandle *Pcreate(const char *, char *const *,
    int *, char *, size_t);

extern const char *Pcreate_error(int);

extern struct ps_prochandle *Pgrab(pid_t, int, int *);
extern struct ps_prochandle *Pgrab_core(const char *, const char *, int, int *);
extern struct ps_prochandle *Pfgrab_core(int, const char *, int *);

extern const char *Pgrab_error(int);

extern  int     Preopen(struct ps_prochandle *);
extern  void    Prelease(struct ps_prochandle *, int);
extern  void    Pfree(struct ps_prochandle *);

extern  int     Pasfd(struct ps_prochandle *);
extern  int     Pctlfd(struct ps_prochandle *);
extern  int     Pcreate_agent(struct ps_prochandle *);
extern  void    Pdestroy_agent(struct ps_prochandle *);
extern  int     Pwait(struct ps_prochandle *, uint_t);
extern  int     Pstop(struct ps_prochandle *, uint_t);
extern  int     Pstate(struct ps_prochandle *);
extern  const psinfo_t *Ppsinfo(struct ps_prochandle *);
extern  const pstatus_t *Pstatus(struct ps_prochandle *);
extern  int     Pcred(struct ps_prochandle *, prcred_t *, int);
extern  int     Pgetareg(struct ps_prochandle *, int, prgreg_t *);
extern  int     Pputareg(struct ps_prochandle *, int, prgreg_t);
extern  int     Psetrun(struct ps_prochandle *, int, int);
extern  ssize_t Pread(struct ps_prochandle *, void *, size_t, uintptr_t);
extern  ssize_t Pread_string(struct ps_prochandle *, char *, size_t, uintptr_t);
extern  ssize_t Pwrite(struct ps_prochandle *, const void *, size_t, uintptr_t);
extern  int     Pclearsig(struct ps_prochandle *);
extern  int     Pclearfault(struct ps_prochandle *);
extern  int     Psetbkpt(struct ps_prochandle *, uintptr_t, ulong_t *);
extern  int     Pdelbkpt(struct ps_prochandle *, uintptr_t, ulong_t);
extern  int     Pxecbkpt(struct ps_prochandle *, ulong_t);
extern  int     Psetflags(struct ps_prochandle *, long);
extern  int     Punsetflags(struct ps_prochandle *, long);
extern  int     Psignal(struct ps_prochandle *, int, int);
extern  int     Pfault(struct ps_prochandle *, int, int);
extern  int     Psysentry(struct ps_prochandle *, int, int);
extern  int     Psysexit(struct ps_prochandle *, int, int);
extern  void    Psetsignal(struct ps_prochandle *, const sigset_t *);
extern  void    Psetfault(struct ps_prochandle *, const fltset_t *);
extern  void    Psetsysentry(struct ps_prochandle *, const sysset_t *);
extern  void    Psetsysexit(struct ps_prochandle *, const sysset_t *);
extern  void    Psync(struct ps_prochandle *);
extern  sysret_t Psyscall(struct ps_prochandle *, int, uint_t, argdes_t *);
extern  int     Pisprocdir(struct ps_prochandle *, const char *);

/*
 * Function prototypes for system calls forced on the victim process.
 */
extern  int     pr_open(struct ps_prochandle *, const char *, int, mode_t);
extern  int     pr_creat(struct ps_prochandle *, const char *, mode_t);
extern  int     pr_close(struct ps_prochandle *, int);
extern  int     pr_door_info(struct ps_prochandle *, int, struct door_info *);
extern  void    *pr_mmap(struct ps_prochandle *,
                        void *, size_t, int, int, int, off_t);
extern  void    *pr_zmap(struct ps_prochandle *,
                        void *, size_t, int, int);
extern  int     pr_munmap(struct ps_prochandle *, void *, size_t);
extern  int     pr_memcntl(struct ps_prochandle *,
                        caddr_t, size_t, int, caddr_t, int, int);
extern  int     pr_sigaction(struct ps_prochandle *,
                        int, const struct sigaction *, struct sigaction *);
extern  int     pr_getitimer(struct ps_prochandle *,
                        int, struct itimerval *);
extern  int     pr_setitimer(struct ps_prochandle *,
                        int, const struct itimerval *, struct itimerval *);
extern  int     pr_ioctl(struct ps_prochandle *, int, int, void *, size_t);
extern  int     pr_fcntl(struct ps_prochandle *, int, int, void *);
extern  int     pr_stat(struct ps_prochandle *, const char *, struct stat *);
extern  int     pr_lstat(struct ps_prochandle *, const char *, struct stat *);
extern  int     pr_fstat(struct ps_prochandle *, int, struct stat *);
extern  int     pr_statvfs(struct ps_prochandle *, const char *, statvfs_t *);
extern  int     pr_fstatvfs(struct ps_prochandle *, int, statvfs_t *);
extern  int     pr_getrlimit(struct ps_prochandle *,
                        int, struct rlimit *);
extern  int     pr_setrlimit(struct ps_prochandle *,
                        int, const struct rlimit *);
#if defined(_LARGEFILE64_SOURCE)
extern  int     pr_getrlimit64(struct ps_prochandle *,
                        int, struct rlimit64 *);
extern  int     pr_setrlimit64(struct ps_prochandle *,
                        int, const struct rlimit64 *);
#endif  /* _LARGEFILE64_SOURCE */
extern  int     pr_lwp_exit(struct ps_prochandle *);
extern  int     pr_exit(struct ps_prochandle *, int);
extern  int     pr_waitid(struct ps_prochandle *,
                        idtype_t, id_t, siginfo_t *, int);
extern  off_t   pr_lseek(struct ps_prochandle *, int, off_t, int);
extern  offset_t pr_llseek(struct ps_prochandle *, int, offset_t, int);
extern  int     pr_rename(struct ps_prochandle *, const char *, const char *);
extern  int     pr_link(struct ps_prochandle *, const char *, const char *);
extern  int     pr_unlink(struct ps_prochandle *, const char *);
extern  int     pr_getpeername(struct ps_prochandle *,
                        int, struct sockaddr *, socklen_t *);
extern  int     pr_getsockname(struct ps_prochandle *,
                        int, struct sockaddr *, socklen_t *);

/*
 * Function prototypes for accessing per-LWP register information.
 */
extern int Plwp_getregs(struct ps_prochandle *, lwpid_t, prgregset_t);
extern int Plwp_setregs(struct ps_prochandle *, lwpid_t, const prgregset_t);

extern int Plwp_getfpregs(struct ps_prochandle *, lwpid_t, prfpregset_t *);
extern int Plwp_setfpregs(struct ps_prochandle *, lwpid_t,
    const prfpregset_t *);

#if defined(sparc) || defined(__sparc)

extern int Plwp_getxregs(struct ps_prochandle *, lwpid_t, prxregset_t *);
extern int Plwp_setxregs(struct ps_prochandle *, lwpid_t, const prxregset_t *);

#if defined(__sparcv9)
extern int Plwp_getasrs(struct ps_prochandle *, lwpid_t, asrset_t);
extern int Plwp_setasrs(struct ps_prochandle *, lwpid_t, const asrset_t);
#endif  /* __sparcv9 */

#endif  /* __sparc */

extern int Plwp_getpsinfo(struct ps_prochandle *, lwpid_t, lwpsinfo_t *);

/*
 * LWP iteration interface.
 */
typedef int proc_lwp_f(void *, const lwpstatus_t *);
extern int Plwp_iter(struct ps_prochandle *, proc_lwp_f *, void *);

/*
 * Symbol table interfaces.
 */

/*
 * Pseudo-names passed to Plookup_by_name() for well-known load objects.
 * NOTE: It is required that PR_OBJ_EXEC and PR_OBJ_LDSO exactly match
 * the definitions of PS_OBJ_EXEC and PS_OBJ_LDSO from <proc_service.h>.
 */
#define PR_OBJ_EXEC     ((const char *)0)       /* search the executable file */
#define PR_OBJ_LDSO     ((const char *)1)       /* search ld.so.1 */
#define PR_OBJ_EVERY    ((const char *)-1)      /* search every load object */

/*
 * 'object_name' is the name of a load object obtained from an
 * iteration over the process's address space mappings (Pmapping_iter),
 * or an iteration over the process's mapped objects (Pobject_iter),
 * or else it is one of the special PR_OBJ_* values above.
 */
extern int Plookup_by_name(struct ps_prochandle *,
    const char *, const char *, GElf_Sym *);

extern int Plookup_by_addr(struct ps_prochandle *,
    uintptr_t, char *, size_t, GElf_Sym *);

typedef int proc_map_f(void *, const prmap_t *, const char *);

extern int Pmapping_iter(struct ps_prochandle *, proc_map_f *, void *);
extern int Pobject_iter(struct ps_prochandle *, proc_map_f *, void *);

extern const prmap_t *Paddr_to_map(struct ps_prochandle *, uintptr_t);
extern const prmap_t *Paddr_to_text_map(struct ps_prochandle *, uintptr_t);
extern const prmap_t *Pname_to_map(struct ps_prochandle *, const char *);

extern char *Pplatform(struct ps_prochandle *, char *, size_t);
extern int Puname(struct ps_prochandle *, struct utsname *);

extern char *Pexecname(struct ps_prochandle *, char *, size_t);
extern char *Pobjname(struct ps_prochandle *, uintptr_t, char *, size_t);

extern char *Pgetenv(struct ps_prochandle *, const char *, char *, size_t);
extern long Pgetauxval(struct ps_prochandle *, int);

/*
 * Symbol table iteration interface.
 */
typedef int proc_sym_f(void *, const GElf_Sym *, const char *);

extern int Psymbol_iter(struct ps_prochandle *,
    const char *, int, int, proc_sym_f *, void *);

/*
 * 'which' selects which symbol table and can be one of the following.
 */
#define PR_SYMTAB       1
#define PR_DYNSYM       2
/*
 * 'type' selects the symbols of interest by binding and type.  It is a bit-
 * mask of one or more of the following flags, whose order MUST match the
 * order of STB and STT constants in <sys/elf.h>.
 */
#define BIND_LOCAL      0x0001
#define BIND_GLOBAL     0x0002
#define BIND_WEAK       0x0004
#define BIND_ANY (BIND_LOCAL|BIND_GLOBAL|BIND_WEAK)
#define TYPE_NOTYPE     0x0100
#define TYPE_OBJECT     0x0200
#define TYPE_FUNC       0x0400
#define TYPE_SECTION    0x0800
#define TYPE_FILE       0x1000
#define TYPE_ANY (TYPE_NOTYPE|TYPE_OBJECT|TYPE_FUNC|TYPE_SECTION|TYPE_FILE)

/*
 * This returns the rtld_db agent handle for the process.
 * The handle will become invalid at the next successful exec() and
 * must not be used beyond that point (see Preset_maps(), below).
 */
extern rd_agent_t *Prd_agent(struct ps_prochandle *);

/*
 * This should be called when an RD_DLACTIVITY event with the
 * RD_CONSISTENT state occurs via librtld_db's event mechanism.
 * This makes libproc's address space mappings and symbol tables current.
 */
extern void Pupdate_maps(struct ps_prochandle *);

/*
 * This must be called after the victim process performs a successful
 * exec() if any of the symbol table interface functions have been called
 * prior to that point.  This is essential because an exec() invalidates
 * all previous symbol table and address space mapping information.
 * It is always safe to call, but if it is called other than after an
 * exec() by the victim process it just causes unnecessary overhead.
 *
 * The rtld_db agent handle obtained from a previous call to Prd_agent() is
 * made invalid by Preset_maps() and Prd_agent() must be called again to get
 * the new handle.
 */
extern void Preset_maps(struct ps_prochandle *);

/*
 * Given an address, Ppltdest() determines if this is part of a PLT, and if
 * so returns the target address of this PLT entry and a flag indicating
 * whether or not this PLT entry has been bound by the run-time linker.
 */
extern uintptr_t Ppltdest(struct ps_prochandle *, uintptr_t, int *);

/*
 * Stack frame iteration interface.
 */
#ifdef SOLARIS_11_B159_OR_LATER
/* building on Nevada-B159 or later so define the new callback */
typedef int proc_stack_f(
    void *,             /* the cookie given to Pstack_iter() */
    const prgregset_t,  /* the frame's registers */
    uint_t,             /* argc for the frame's function */
    const long *,       /* argv for the frame's function */
    int,                /* bitwise flags describing the frame (see below) */
    int);               /* a signal number */

#define PR_SIGNAL_FRAME    1    /* called by a signal handler */
#define PR_FOUND_SIGNAL    2    /* we found the corresponding signal number */
#else
/* building on Nevada-B158 or earlier so define the old callback */
typedef int proc_stack_f(void *, const prgregset_t, uint_t, const long *);
#endif

extern int Pstack_iter(struct ps_prochandle *,
    const prgregset_t, proc_stack_f *, void *);

/*
 * Compute the full pathname of a named directory without using chdir().
 * This is useful for dealing with /proc/<pid>/cwd.
 */
extern char *proc_dirname(const char *, char *, size_t);

/*
 * Remove unprintable characters from psinfo.pr_psargs and replace with
 * whitespace characters so it is safe for printing.
 */
extern void proc_unctrl_psinfo(psinfo_t *);

/*
 * Utility functions for processing arguments which should be /proc files,
 * pids, and/or core files.  The returned error code can be passed to
 * Pgrab_error() in order to convert it to an error string.
 */
#define PR_ARG_PIDS     0x1     /* Allow pid and /proc file arguments */
#define PR_ARG_CORES    0x2     /* Allow core file arguments */

#define PR_ARG_ANY      (PR_ARG_PIDS | PR_ARG_CORES)

extern struct ps_prochandle *proc_arg_grab(const char *, int, int, int *);
extern pid_t proc_arg_psinfo(const char *, int, psinfo_t *, int *);

/*
 * Utility functions for obtaining information via /proc without actually
 * performing a Pcreate() or Pgrab():
 */
extern int proc_get_auxv(pid_t, auxv_t *, int);
extern int proc_get_cred(pid_t, prcred_t *, int);
extern int proc_get_psinfo(pid_t, psinfo_t *);
extern int proc_get_status(pid_t, pstatus_t *);

/*
 * Utility functions for debugging tools to convert numeric fault,
 * signal, and system call numbers to symbolic names:
 */
extern char *proc_fltname(int, char *, size_t);
extern char *proc_signame(int, char *, size_t);
extern char *proc_sysname(int, char *, size_t);

#ifdef  __cplusplus
}
#endif

#endif  /* _LIBPROC_H */