static Port * open_port(Process* p, Eterm name, Eterm settings, int *err_typep, int *err_nump) { Sint i; Eterm option; Uint arity; Eterm* tp; Uint* nargs; erts_driver_t* driver; char* name_buf = NULL; SysDriverOpts opts; Sint linebuf; Eterm edir = NIL; byte dir[MAXPATHLEN]; erts_aint32_t sflgs = 0; Port *port; /* These are the defaults */ opts.packet_bytes = 0; opts.use_stdio = 1; opts.redir_stderr = 0; opts.read_write = 0; opts.hide_window = 0; opts.wd = NULL; opts.envir = NULL; opts.exit_status = 0; opts.overlapped_io = 0; opts.spawn_type = ERTS_SPAWN_ANY; opts.argv = NULL; opts.parallelism = erts_port_parallelism; linebuf = 0; *err_nump = 0; if (is_not_list(settings) && is_not_nil(settings)) { goto badarg; } /* * Parse the settings. */ if (is_not_nil(settings)) { nargs = list_val(settings); while (1) { if (is_tuple_arity(*nargs, 2)) { tp = tuple_val(*nargs); arity = *tp++; option = *tp++; if (option == am_packet) { if (is_not_small(*tp)) { goto badarg; } opts.packet_bytes = signed_val(*tp); switch (opts.packet_bytes) { case 1: case 2: case 4: break; default: goto badarg; } } else if (option == am_line) { if (is_not_small(*tp)) { goto badarg; } linebuf = signed_val(*tp); if (linebuf <= 0) { goto badarg; } } else if (option == am_env) { byte* bytes; if ((bytes = convert_environment(p, *tp)) == NULL) { goto badarg; } opts.envir = (char *) bytes; } else if (option == am_args) { char **av; char **oav = opts.argv; if ((av = convert_args(*tp)) == NULL) { goto badarg; } opts.argv = av; if (oav) { opts.argv[0] = oav[0]; oav[0] = erts_default_arg0; free_args(oav); } } else if (option == am_arg0) { char *a0; if ((a0 = erts_convert_filename_to_native(*tp, NULL, 0, ERTS_ALC_T_TMP, 1, 1, NULL)) == NULL) { goto badarg; } if (opts.argv == NULL) { opts.argv = erts_alloc(ERTS_ALC_T_TMP, 2 * sizeof(char **)); opts.argv[0] = a0; opts.argv[1] = NULL; } else { if (opts.argv[0] != erts_default_arg0) { erts_free(ERTS_ALC_T_TMP, opts.argv[0]); } opts.argv[0] = a0; } } else if (option == am_cd) { edir = *tp; } else if (option == am_parallelism) { if (*tp == am_true) opts.parallelism = 1; else if (*tp == am_false) opts.parallelism = 0; else goto badarg; } else { goto badarg; } } else if (*nargs == am_stream) { opts.packet_bytes = 0; } else if (*nargs == am_use_stdio) { opts.use_stdio = 1; } else if (*nargs == am_stderr_to_stdout) { opts.redir_stderr = 1; } else if (*nargs == am_line) { linebuf = 512; } else if (*nargs == am_nouse_stdio) { opts.use_stdio = 0; } else if (*nargs == am_binary) { sflgs |= ERTS_PORT_SFLG_BINARY_IO; } else if (*nargs == am_in) { opts.read_write |= DO_READ; } else if (*nargs == am_out) { opts.read_write |= DO_WRITE; } else if (*nargs == am_eof) { sflgs |= ERTS_PORT_SFLG_SOFT_EOF; } else if (*nargs == am_hide) { opts.hide_window = 1; } else if (*nargs == am_exit_status) { opts.exit_status = 1; } else if (*nargs == am_overlapped_io) { opts.overlapped_io = 1; } else { goto badarg; } if (is_nil(*++nargs)) break; if (is_not_list(*nargs)) { goto badarg; } nargs = list_val(*nargs); } } if (opts.read_write == 0) /* implement default */ opts.read_write = DO_READ|DO_WRITE; /* Mutually exclusive arguments. */ if((linebuf && opts.packet_bytes) || (opts.redir_stderr && !opts.use_stdio)) { goto badarg; } /* * Parse the first argument and start the appropriate driver. */ if (is_atom(name) || (i = is_string(name))) { /* a vanilla port */ if (is_atom(name)) { name_buf = (char *) erts_alloc(ERTS_ALC_T_TMP, atom_tab(atom_val(name))->len+1); sys_memcpy((void *) name_buf, (void *) atom_tab(atom_val(name))->name, atom_tab(atom_val(name))->len); name_buf[atom_tab(atom_val(name))->len] = '\0'; } else { name_buf = (char *) erts_alloc(ERTS_ALC_T_TMP, i + 1); if (intlist_to_buf(name, name_buf, i) != i) erts_exit(ERTS_ERROR_EXIT, "%s:%d: Internal error\n", __FILE__, __LINE__); name_buf[i] = '\0'; } driver = &vanilla_driver; } else { if (is_not_tuple(name)) { goto badarg; /* Not a process or fd port */ } tp = tuple_val(name); arity = *tp++; if (arity == make_arityval(0)) { goto badarg; } if (*tp == am_spawn || *tp == am_spawn_driver || *tp == am_spawn_executable) { /* A process port */ int encoding; if (arity != make_arityval(2)) { goto badarg; } name = tp[1]; encoding = erts_get_native_filename_encoding(); /* Do not convert the command to utf-16le yet, do that in win32 specific code */ /* since the cmd is used for comparsion with drivers names and copied to port info */ if (encoding == ERL_FILENAME_WIN_WCHAR) { encoding = ERL_FILENAME_UTF8; } if ((name_buf = erts_convert_filename_to_encoding(name, NULL, 0, ERTS_ALC_T_TMP,0,1, encoding, NULL, 0)) == NULL) { goto badarg; } if (*tp == am_spawn_driver) { opts.spawn_type = ERTS_SPAWN_DRIVER; } else if (*tp == am_spawn_executable) { opts.spawn_type = ERTS_SPAWN_EXECUTABLE; } driver = &spawn_driver; } else if (*tp == am_fd) { /* An fd port */ int n; struct Sint_buf sbuf; char* p; if (arity != make_arityval(3)) { goto badarg; } if (is_not_small(tp[1]) || is_not_small(tp[2])) { goto badarg; } opts.ifd = unsigned_val(tp[1]); opts.ofd = unsigned_val(tp[2]); /* Syntesize name from input and output descriptor. */ name_buf = erts_alloc(ERTS_ALC_T_TMP, 2*sizeof(struct Sint_buf) + 2); p = Sint_to_buf(opts.ifd, &sbuf); n = sys_strlen(p); sys_strncpy(name_buf, p, n); name_buf[n] = '/'; p = Sint_to_buf(opts.ofd, &sbuf); sys_strcpy(name_buf+n+1, p); driver = &fd_driver; } else { goto badarg; } } if ((driver != &spawn_driver && opts.argv != NULL) || (driver == &spawn_driver && opts.spawn_type != ERTS_SPAWN_EXECUTABLE && opts.argv != NULL)) { /* Argument vector only if explicit spawn_executable */ goto badarg; } if (edir != NIL) { if ((opts.wd = erts_convert_filename_to_native(edir, NULL, 0, ERTS_ALC_T_TMP,0,1,NULL)) == NULL) { goto badarg; } } if (driver != &spawn_driver && opts.exit_status) { goto badarg; } if (IS_TRACED_FL(p, F_TRACE_SCHED_PROCS)) { trace_sched(p, ERTS_PROC_LOCK_MAIN, am_out); } erts_smp_proc_unlock(p, ERTS_PROC_LOCK_MAIN); port = erts_open_driver(driver, p->common.id, name_buf, &opts, err_typep, err_nump); #ifdef USE_VM_PROBES if (port && DTRACE_ENABLED(port_open)) { DTRACE_CHARBUF(process_str, DTRACE_TERM_BUF_SIZE); DTRACE_CHARBUF(port_str, DTRACE_TERM_BUF_SIZE); dtrace_proc_str(p, process_str); erts_snprintf(port_str, sizeof(DTRACE_CHARBUF_NAME(port_str)), "%T", port->common.id); DTRACE3(port_open, process_str, name_buf, port_str); } #endif if (port && IS_TRACED_FL(port, F_TRACE_PORTS)) trace_port(port, am_getting_linked, p->common.id); erts_smp_proc_lock(p, ERTS_PROC_LOCK_MAIN); if (IS_TRACED_FL(p, F_TRACE_SCHED_PROCS)) { trace_sched(p, ERTS_PROC_LOCK_MAIN, am_in); } if (!port) { DEBUGF(("open_driver returned (%d:%d)\n", err_typep ? *err_typep : 4711, err_nump ? *err_nump : 4711)); goto do_return; } if (linebuf && port->linebuf == NULL){ port->linebuf = allocate_linebuf(linebuf); sflgs |= ERTS_PORT_SFLG_LINEBUF_IO; } if (sflgs) erts_atomic32_read_bor_relb(&port->state, sflgs); do_return: if (name_buf) erts_free(ERTS_ALC_T_TMP, (void *) name_buf); if (opts.argv) { free_args(opts.argv); } if (opts.wd && opts.wd != ((char *)dir)) { erts_free(ERTS_ALC_T_TMP, (void *) opts.wd); } return port; badarg: if (err_typep) *err_typep = -3; if (err_nump) *err_nump = BADARG; port = NULL; goto do_return; }
/* * Register a process or port (can't be registered twice). * Returns 0 if name, process or port is already registered. * * When smp support is enabled: * * Assumes that main lock is locked (and only main lock) * on c_p. * */ int erts_register_name(Process *c_p, Eterm name, Eterm id) { int res = 0; Process *proc = NULL; Port *port = NULL; RegProc r, *rp; ERTS_SMP_CHK_HAVE_ONLY_MAIN_PROC_LOCK(c_p); if (is_not_atom(name) || name == am_undefined) return res; if (c_p->common.id == id) /* A very common case I think... */ proc = c_p; else { if (is_not_internal_pid(id) && is_not_internal_port(id)) return res; erts_smp_proc_unlock(c_p, ERTS_PROC_LOCK_MAIN); if (is_internal_port(id)) { port = erts_id2port(id); if (!port) goto done; } } #ifdef ERTS_SMP { ErtsProcLocks proc_locks = proc ? ERTS_PROC_LOCK_MAIN : 0; reg_safe_write_lock(proc, &proc_locks); if (proc && !proc_locks) erts_smp_proc_lock(c_p, ERTS_PROC_LOCK_MAIN); } #endif if (is_internal_pid(id)) { if (!proc) proc = erts_pid2proc(NULL, 0, id, ERTS_PROC_LOCK_MAIN); r.p = proc; if (!proc) goto done; if (proc->common.u.alive.reg) goto done; r.pt = NULL; } else { ASSERT(!INVALID_PORT(port, id)); ERTS_SMP_LC_ASSERT(erts_lc_is_port_locked(port)); r.pt = port; if (r.pt->common.u.alive.reg) goto done; r.p = NULL; } r.name = name; rp = (RegProc*) hash_put(&process_reg, (void*) &r); if (proc && rp->p == proc) { if (IS_TRACED_FL(proc, F_TRACE_PROCS)) { trace_proc(proc, ERTS_PROC_LOCK_MAIN, proc, am_register, name); } proc->common.u.alive.reg = rp; } else if (port && rp->pt == port) { if (IS_TRACED_FL(port, F_TRACE_PORTS)) { trace_port(port, am_register, name); } port->common.u.alive.reg = rp; } if ((rp->p && rp->p->common.id == id) || (rp->pt && rp->pt->common.id == id)) { res = 1; } done: reg_write_unlock(); if (port) erts_port_release(port); if (c_p != proc) { if (proc) erts_smp_proc_unlock(proc, ERTS_PROC_LOCK_MAIN); erts_smp_proc_lock(c_p, ERTS_PROC_LOCK_MAIN); } return res; }
/* * Unregister a name * Return 0 if not registered * Otherwise returns 1 * */ int erts_unregister_name(Process *c_p, ErtsProcLocks c_p_locks, Port *c_prt, Eterm name) { int res = 0; RegProc r, *rp; Port *port = c_prt; ErtsProcLocks current_c_p_locks = 0; #ifdef ERTS_SMP /* * SMP note: If 'c_prt != NULL' and 'c_prt->reg->name == name', * we are *not* allowed to temporarily release the lock * on c_prt. */ if (!c_p) { c_p_locks = 0; } current_c_p_locks = c_p_locks; restart: reg_safe_write_lock(c_p, ¤t_c_p_locks); #endif r.name = name; if (is_non_value(name)) { /* Unregister current process name */ ASSERT(c_p); #ifdef ERTS_SMP if (current_c_p_locks != c_p_locks) { erts_smp_proc_lock(c_p, c_p_locks); current_c_p_locks = c_p_locks; } #endif if (c_p->common.u.alive.reg) { r.name = c_p->common.u.alive.reg->name; } else { /* Name got unregistered while main lock was released */ res = 0; goto done; } } if ((rp = (RegProc*) hash_get(&process_reg, (void*) &r)) != NULL) { if (rp->pt) { if (port != rp->pt) { #ifdef ERTS_SMP if (port) { ASSERT(port != c_prt); erts_port_release(port); port = NULL; } if (erts_smp_port_trylock(rp->pt) == EBUSY) { Eterm id = rp->pt->common.id; /* id read only... */ /* Unlock all locks, acquire port lock, and restart... */ if (current_c_p_locks) { erts_smp_proc_unlock(c_p, current_c_p_locks); current_c_p_locks = 0; } reg_write_unlock(); port = erts_id2port(id); goto restart; } #endif port = rp->pt; } ASSERT(rp->pt == port); ERTS_SMP_LC_ASSERT(erts_lc_is_port_locked(port)); rp->pt->common.u.alive.reg = NULL; if (IS_TRACED_FL(port, F_TRACE_PORTS)) { if (current_c_p_locks) { erts_smp_proc_unlock(c_p, current_c_p_locks); current_c_p_locks = 0; } trace_port(port, am_unregister, r.name); } } else if (rp->p) { #ifdef ERTS_SMP erts_proc_safelock(c_p, current_c_p_locks, c_p_locks, rp->p, (c_p == rp->p) ? current_c_p_locks : 0, ERTS_PROC_LOCK_MAIN); current_c_p_locks = c_p_locks; #endif rp->p->common.u.alive.reg = NULL; if (IS_TRACED_FL(rp->p, F_TRACE_PROCS)) { trace_proc(rp->p, (c_p == rp->p) ? c_p_locks : ERTS_PROC_LOCK_MAIN, rp->p, am_unregister, r.name); } #ifdef ERTS_SMP if (rp->p != c_p) { erts_smp_proc_unlock(rp->p, ERTS_PROC_LOCK_MAIN); } #endif } hash_erase(&process_reg, (void*) &r); res = 1; } done: reg_write_unlock(); if (c_prt != port) { if (port) { erts_port_release(port); } if (c_prt) { erts_smp_port_lock(c_prt); } } #ifdef ERTS_SMP if (c_p && !current_c_p_locks) { erts_smp_proc_lock(c_p, c_p_locks); } #endif return res; }
/* * Unregister a name * Return 0 if not registered * Otherwise returns 1 * */ int erts_unregister_name(Process *c_p, ErtsProcLocks c_p_locks, Port *c_prt, Eterm name) { int res = 0; RegProc r, *rp; Port *port = c_prt; #ifdef ERTS_SMP ErtsProcLocks current_c_p_locks; /* * SMP note: If 'c_prt != NULL' and 'c_prt->reg->name == name', * we are *not* allowed to temporarily release the lock * on c_prt. */ if (!c_p) c_p_locks = 0; current_c_p_locks = c_p_locks; restart: reg_safe_write_lock(c_p, ¤t_c_p_locks); #endif r.name = name; if ((rp = (RegProc*) hash_get(&process_reg, (void*) &r)) != NULL) { if (rp->pt) { #ifdef ERTS_SMP if (port != rp->pt) { if (port) { ERTS_SMP_LC_ASSERT(port != c_prt); erts_smp_port_unlock(port); port = NULL; } if (erts_smp_port_trylock(rp->pt) == EBUSY) { Eterm id = rp->pt->id; /* id read only... */ /* Unlock all locks, acquire port lock, and restart... */ if (current_c_p_locks) { erts_smp_proc_unlock(c_p, current_c_p_locks); current_c_p_locks = 0; } reg_read_unlock(); port = erts_id2port(id, NULL, 0); goto restart; } port = rp->pt; } #endif ERTS_SMP_LC_ASSERT(rp->pt == port && erts_lc_is_port_locked(port)); rp->pt->reg = NULL; if (IS_TRACED_FL(port, F_TRACE_PORTS)) { trace_port(port, am_unregister, name); } } else if (rp->p) { Process* p = rp->p; #ifdef ERTS_SMP erts_proc_safelock(c_p, current_c_p_locks, c_p_locks, rp->p, 0, ERTS_PROC_LOCK_MAIN); current_c_p_locks = c_p_locks; #endif p->reg = NULL; #ifdef ERTS_SMP if (rp->p != c_p) erts_smp_proc_unlock(rp->p, ERTS_PROC_LOCK_MAIN); #endif if (IS_TRACED_FL(p, F_TRACE_PROCS)) { trace_proc(c_p, p, am_unregister, name); } } hash_erase(&process_reg, (void*) &r); res = 1; } reg_write_unlock(); if (c_prt != port) { if (port) erts_smp_port_unlock(port); if (c_prt) erts_smp_port_lock(c_prt); } #ifdef ERTS_SMP if (c_p && !current_c_p_locks) erts_smp_proc_lock(c_p, c_p_locks); #endif return res; }