diff options
Diffstat (limited to 'erts/emulator/sys/unix')
| -rw-r--r-- | erts/emulator/sys/unix/erl_child_setup.c | 117 | ||||
| -rw-r--r-- | erts/emulator/sys/unix/erl_unix_sys.h | 2 | ||||
| -rw-r--r-- | erts/emulator/sys/unix/sys.c | 63 | ||||
| -rw-r--r-- | erts/emulator/sys/unix/sys_drivers.c | 55 |
4 files changed, 180 insertions, 57 deletions
diff --git a/erts/emulator/sys/unix/erl_child_setup.c b/erts/emulator/sys/unix/erl_child_setup.c index 6beb316350..69fc6c2879 100644 --- a/erts/emulator/sys/unix/erl_child_setup.c +++ b/erts/emulator/sys/unix/erl_child_setup.c @@ -54,6 +54,7 @@ #include <stdlib.h> #include <stdio.h> +#include <stdarg.h> #include <sys/wait.h> #define WANT_NONBLOCKING @@ -74,15 +75,22 @@ //#define HARD_DEBUG #ifdef HARD_DEBUG -#define DEBUG_PRINT(fmt, ...) fprintf(stderr, fmt "\r\n", ##__VA_ARGS__) +#define DEBUG_PRINT(fmt, ...) fprintf(stderr, "%d:" fmt "\r\n", getpid(), ##__VA_ARGS__) #else #define DEBUG_PRINT(fmt, ...) #endif -#define ABORT(fmt, ...) do { \ - fprintf(stderr, "erl_child_setup: " fmt "\r\n", ##__VA_ARGS__); \ - abort(); \ - } while(0) +static char abort_reason[200]; /* for core dump inspection */ + +static void ABORT(const char* fmt, ...) +{ + va_list arglist; + va_start(arglist, fmt); + vsprintf(abort_reason, fmt, arglist); + fprintf(stderr, "erl_child_setup: %s\r\n", abort_reason); + va_end(arglist); + abort(); +} #ifdef DEBUG void @@ -123,12 +131,13 @@ static int sigchld_pipe[2]; static int start_new_child(int pipes[]) { + int errln = -1; int size, res, i, pos = 0; char *buff, *o_buff; - char *cmd, *wd, **new_environ, **args = NULL; + char *cmd, *cwd, *wd, **new_environ, **args = NULL; - Sint cnt, flags; + Sint32 cnt, flags; /* only child executes here */ @@ -137,6 +146,7 @@ start_new_child(int pipes[]) } while(res < 0 && (errno == EINTR || errno == ERRNO_BLOCK)); if (res <= 0) { + errln = __LINE__; goto child_error; } @@ -148,10 +158,12 @@ start_new_child(int pipes[]) if ((res = read(pipes[0], buff + pos, size - pos)) < 0) { if (errno == ERRNO_BLOCK || errno == EINTR) continue; + errln = __LINE__; goto child_error; } if (res == 0) { errno = EPIPE; + errln = __LINE__; goto child_error; } pos += res; @@ -160,12 +172,16 @@ start_new_child(int pipes[]) o_buff = buff; flags = get_int32(buff); - buff += sizeof(Sint32); + buff += sizeof(flags); DEBUG_PRINT("flags = %d", flags); cmd = buff; buff += strlen(buff) + 1; + + cwd = buff; + buff += strlen(buff) + 1; + if (*buff == '\0') { wd = NULL; } else { @@ -177,10 +193,10 @@ start_new_child(int pipes[]) DEBUG_PRINT("wd = %s", wd); cnt = get_int32(buff); - buff += sizeof(Sint32); + buff += sizeof(cnt); new_environ = malloc(sizeof(char*)*(cnt + 1)); - DEBUG_PRINT("env_len = %ld", cnt); + DEBUG_PRINT("env_len = %d", cnt); for (i = 0; i < cnt; i++, buff++) { new_environ[i] = buff; while(*buff != '\0') buff++; @@ -190,7 +206,7 @@ start_new_child(int pipes[]) if (o_buff + size != buff) { /* This is a spawn executable call */ cnt = get_int32(buff); - buff += sizeof(Sint32); + buff += sizeof(cnt); args = malloc(sizeof(char*)*(cnt + 1)); for (i = 0; i < cnt; i++, buff++) { args[i] = buff; @@ -201,7 +217,12 @@ start_new_child(int pipes[]) if (o_buff + size != buff) { errno = EINVAL; - goto child_error; + errln = __LINE__; + fprintf(stderr,"erl_child_setup: failed with protocol " + "error %d on line %d", errno, errln); + /* we abort here as it is most likely a symptom of an + emulator/erl_child_setup bug */ + abort(); } DEBUG_PRINT("read ack"); @@ -213,12 +234,32 @@ start_new_child(int pipes[]) ASSERT(res == sizeof(proto)); } } while(res < 0 && (errno == EINTR || errno == ERRNO_BLOCK)); + if (res < 1) { errno = EPIPE; + errln = __LINE__; goto child_error; } - DEBUG_PRINT("Do that forking business: '%s'\n",cmd); + DEBUG_PRINT("Set cwd to: '%s'",cwd); + + if (chdir(cwd) < 0) { + /* This is not good, it probably means that the cwd of + beam is invalid. We ignore it and try anyways as + the child might now need a cwd or the chdir below + could take us to a valid directory. + */ + } + + DEBUG_PRINT("Set wd to: '%s'",wd); + + if (wd && chdir(wd) < 0) { + int err = errno; + fprintf(stderr,"spawn: Could not cd to %s\r\n", wd); + _exit(err); + } + + DEBUG_PRINT("Do that forking business: '%s'",cmd); /* When the dup2'ing below is done, only fd's 0, 1, 2 and maybe 3, 4 should survive the @@ -228,25 +269,34 @@ start_new_child(int pipes[]) if (flags & FORKER_FLAG_USE_STDIO) { /* stdin for process */ if (flags & FORKER_FLAG_DO_WRITE && - dup2(pipes[0], 0) < 0) + dup2(pipes[0], 0) < 0) { + errln = __LINE__; goto child_error; + } /* stdout for process */ if (flags & FORKER_FLAG_DO_READ && - dup2(pipes[1], 1) < 0) + dup2(pipes[1], 1) < 0) { + errln = __LINE__; goto child_error; + } } else { /* XXX will fail if pipes[0] == 4 (unlikely..) */ - if (flags & FORKER_FLAG_DO_READ && dup2(pipes[1], 4) < 0) + if (flags & FORKER_FLAG_DO_READ && dup2(pipes[1], 4) < 0) { + errln = __LINE__; goto child_error; - if (flags & FORKER_FLAG_DO_WRITE && dup2(pipes[0], 3) < 0) + } + if (flags & FORKER_FLAG_DO_WRITE && dup2(pipes[0], 3) < 0) { + errln = __LINE__; goto child_error; + } } - if (dup2(pipes[2], 2) < 0) - goto child_error; - - if (wd && chdir(wd) < 0) + /* we do the dup2 of stderr last so that errors + in child_error will be printed to stderr */ + if (dup2(pipes[2], 2) < 0) { + errln = __LINE__; goto child_error; + } #if defined(USE_SETPGRP_NOARGS) /* SysV */ (void) setpgrp(); @@ -268,9 +318,14 @@ start_new_child(int pipes[]) } else { execle(SHELL, "sh", "-c", cmd, (char *) NULL, new_environ); } + + DEBUG_PRINT("exec error: %d",errno); + _exit(errno); + child_error: - DEBUG_PRINT("exec error: %d\r\n",errno); - _exit(128 + errno); + fprintf(stderr,"erl_child_setup: failed with error %d on line %d\r\n", + errno, errln); + _exit(errno); } @@ -293,7 +348,7 @@ child_error: * for posterity. */ static void handle_sigchld(int sig) { - int buff[2], res; + int buff[2], res, __preverrno = errno; sys_sigblock(SIGCHLD); @@ -307,6 +362,16 @@ static void handle_sigchld(int sig) { } sys_sigrelease(SIGCHLD); + + /* We save and restore the original errno as otherwise + the thread we are running in may end up with an + unexpected errno. An example of when this happened + was when the select in main had gotten an EINTR but + before the errno was checked the signal handler + was called and set errno to ECHILD from waitpid + which caused erl_child_setup to abort as it does + not expect ECHILD to be set after select */ + errno = __preverrno; } #if defined(__ANDROID__) @@ -368,7 +433,7 @@ main(int argc, char *argv[]) sigemptyset(&sa.sa_mask); sa.sa_flags = SA_RESTART | SA_NOCLDSTOP; if (sigaction(SIGCHLD, &sa, 0) == -1) { - perror(0); + perror(NULL); exit(1); } @@ -461,7 +526,7 @@ main(int argc, char *argv[]) proto.action = ErtsSysForkerProtoAction_SigChld; proto.u.sigchld.error_number = ibuff[1]; - DEBUG_PRINT("send %s to %d", buff, uds_fd); + DEBUG_PRINT("send sigchld to %d (errno = %d)", uds_fd, ibuff[1]); if (write(uds_fd, &proto, sizeof(proto)) < 0) { if (errno == EINTR) continue; diff --git a/erts/emulator/sys/unix/erl_unix_sys.h b/erts/emulator/sys/unix/erl_unix_sys.h index 3a0d23cd36..b64b0d87f6 100644 --- a/erts/emulator/sys/unix/erl_unix_sys.h +++ b/erts/emulator/sys/unix/erl_unix_sys.h @@ -282,7 +282,7 @@ ERTS_GLB_INLINE ErtsSysPerfCounter erts_sys_perf_counter(void); #if ERTS_GLB_INLINE_INCL_FUNC_DEF -ERTS_GLB_INLINE ErtsSysPerfCounter +ERTS_GLB_FORCE_INLINE ErtsSysPerfCounter erts_sys_perf_counter() { return (*erts_sys_time_data__.r.o.perf_counter)(); diff --git a/erts/emulator/sys/unix/sys.c b/erts/emulator/sys/unix/sys.c index 6fb86f6dda..e135dbff99 100644 --- a/erts/emulator/sys/unix/sys.c +++ b/erts/emulator/sys/unix/sys.c @@ -90,8 +90,6 @@ extern void erl_sys_args(int*, char**); extern void erts_sys_init_float(void); -extern void erl_crash_dump(char* file, int line, char* fmt, ...); - #ifdef DEBUG static int debug_log = 0; @@ -121,9 +119,8 @@ erts_smp_atomic_t sys_misc_mem_sz; static void smp_sig_notify(char c); static int sig_notify_fds[2] = {-1, -1}; -#if !defined(ETHR_UNUSABLE_SIGUSRX) && defined(ERTS_THR_HAVE_SIG_FUNCS) +#ifdef ERTS_SYS_SUSPEND_SIGNAL static int sig_suspend_fds[2] = {-1, -1}; -#define ERTS_SYS_SUSPEND_SIGNAL SIGUSR2 #endif #endif @@ -409,11 +406,16 @@ erts_sys_pre_init(void) #ifdef ERTS_THR_HAVE_SIG_FUNCS sigemptyset(&thr_create_sigmask); sigaddset(&thr_create_sigmask, SIGINT); /* block interrupt */ + sigaddset(&thr_create_sigmask, SIGTERM); /* block terminate signal */ sigaddset(&thr_create_sigmask, SIGUSR1); /* block user defined signal */ #endif erts_thr_init(&eid); +#ifdef ERTS_ENABLE_LOCK_CHECK + erts_lc_init(); +#endif + #ifdef ERTS_ENABLE_LOCK_COUNT erts_lcnt_init(); #endif @@ -653,6 +655,40 @@ static RETSIGTYPE request_break(int signum) #endif } +static void stop_requested(void) { + Process* p = NULL; + Eterm msg, *hp; + ErtsProcLocks locks = 0; + ErlOffHeap *ohp; + Eterm id = erts_whereis_name_to_id(NULL, am_init); + + if ((p = (erts_pid2proc_opt(NULL, 0, id, 0, ERTS_P2P_FLG_INC_REFC))) != NULL) { + ErtsMessage *msgp = erts_alloc_message_heap(p, &locks, 3, &hp, &ohp); + + /* init ! {stop,stop} */ + msg = TUPLE2(hp, am_stop, am_stop); + erts_queue_message(p, locks, msgp, msg, am_system); + + if (locks) + erts_smp_proc_unlock(p, locks); + erts_proc_dec_refc(p); + } +} + +#if (defined(SIG_SIGSET) || defined(SIG_SIGNAL)) +static RETSIGTYPE request_stop(void) +#else +static RETSIGTYPE request_stop(int signum) +#endif +{ +#ifdef ERTS_SMP + smp_sig_notify('S'); +#else + stop_requested(); +#endif +} + + static ERTS_INLINE void sigusr1_exit(void) { @@ -672,7 +708,7 @@ sigusr1_exit(void) } prepare_crash_dump(secs); - erts_exit(ERTS_ERROR_EXIT, "Received SIGUSR1\n"); + erts_exit(ERTS_DUMP_EXIT, "Received SIGUSR1\n"); } #ifdef ETHR_UNUSABLE_SIGUSRX @@ -715,11 +751,13 @@ static RETSIGTYPE suspend_signal(void) static RETSIGTYPE suspend_signal(int signum) #endif { - int res; - int buf[1]; - do { - res = read(sig_suspend_fds[0], buf, sizeof(int)); - } while (res < 0 && errno == EINTR); + int res, buf[1], tmp_errno = errno; + do { + res = read(sig_suspend_fds[0], buf, sizeof(int)); + } while (res < 0 && errno == EINTR); + + /* restore previous errno in case read changed it */ + errno = tmp_errno; } #endif /* #ifdef ERTS_SYS_SUSPEND_SIGNAL */ @@ -747,6 +785,7 @@ static RETSIGTYPE do_quit(int signum) /* Disable break */ void erts_set_ignore_break(void) { sys_signal(SIGINT, SIG_IGN); + sys_signal(SIGTERM, SIG_IGN); sys_signal(SIGQUIT, SIG_IGN); sys_signal(SIGTSTP, SIG_IGN); } @@ -772,6 +811,7 @@ void erts_replace_intr(void) { void init_break_handler(void) { sys_signal(SIGINT, request_break); + sys_signal(SIGTERM, request_stop); #ifndef ETHR_UNUSABLE_SIGUSRX sys_signal(SIGUSR1, user_signal1); #endif /* #ifndef ETHR_UNUSABLE_SIGUSRX */ @@ -1285,6 +1325,9 @@ signal_dispatcher_thread_func(void *unused) switch (buf[i]) { case 0: /* Emulator initialized */ break; + case 'S': /* SIGTERM */ + stop_requested(); + break; case 'I': /* SIGINT */ break_requested(); break; diff --git a/erts/emulator/sys/unix/sys_drivers.c b/erts/emulator/sys/unix/sys_drivers.c index 812112fb91..400f163652 100644 --- a/erts/emulator/sys/unix/sys_drivers.c +++ b/erts/emulator/sys/unix/sys_drivers.c @@ -554,7 +554,7 @@ static ErlDrvData spawn_start(ErlDrvPort port_num, char* name, ErtsSysDriverData *dd; char *cmd_line; char wd_buff[MAXPATHLEN+1]; - char *wd; + char *wd, *cwd; int ifd[2], ofd[2], stderrfd; if (pipe(ifd) < 0) return ERL_DRV_ERROR_ERRNO; @@ -631,24 +631,22 @@ static ErlDrvData spawn_start(ErlDrvPort port_num, char* name, return ERL_DRV_ERROR_ERRNO; } - if (opts->wd == NULL) { - if ((wd = getcwd(wd_buff, MAXPATHLEN+1)) == NULL) { - /* on some OSs this call opens a fd in the - background which means that this can - return EMFILE */ - int err = errno; - close_pipes(ifd, ofd); - erts_free(ERTS_ALC_T_TMP, (void *) cmd_line); - if (new_environ != environ) - erts_free(ERTS_ALC_T_ENVIRONMENT, (void *) new_environ); - erts_smp_rwmtx_runlock(&environ_rwmtx); - errno = err; - return ERL_DRV_ERROR_ERRNO; - } - } else { - wd = opts->wd; + if ((cwd = getcwd(wd_buff, MAXPATHLEN+1)) == NULL) { + /* on some OSs this call opens a fd in the + background which means that this can + return EMFILE */ + int err = errno; + close_pipes(ifd, ofd); + erts_free(ERTS_ALC_T_TMP, (void *) cmd_line); + if (new_environ != environ) + erts_free(ERTS_ALC_T_ENVIRONMENT, (void *) new_environ); + erts_smp_rwmtx_runlock(&environ_rwmtx); + errno = err; + return ERL_DRV_ERROR_ERRNO; } + wd = opts->wd; + { struct iovec *io_vector; int iov_len = 5; @@ -660,6 +658,8 @@ static ErlDrvData spawn_start(ErlDrvPort port_num, char* name, | (opts->read_write & DO_READ ? FORKER_FLAG_DO_READ : 0) | (opts->read_write & DO_WRITE ? FORKER_FLAG_DO_WRITE : 0); + if (wd) iov_len++; + /* count number of elements in environment */ while(new_environ[env_len] != NULL) env_len++; @@ -688,6 +688,10 @@ static ErlDrvData spawn_start(ErlDrvPort port_num, char* name, return ERL_DRV_ERROR_ERRNO; } + /* + * Whitebox test port_SUITE:pipe_limit_env + * assumes this command payload format. + */ io_vector[i].iov_base = (void*)&buffsz; io_vector[i++].iov_len = sizeof(buffsz); @@ -700,10 +704,16 @@ static ErlDrvData spawn_start(ErlDrvPort port_num, char* name, io_vector[i++].iov_len = len; buffsz += len; - io_vector[i].iov_base = wd; + io_vector[i].iov_base = cwd; io_vector[i].iov_len = strlen(io_vector[i].iov_base) + 1; buffsz += io_vector[i++].iov_len; + if (wd) { + io_vector[i].iov_base = wd; + io_vector[i].iov_len = strlen(io_vector[i].iov_base) + 1; + buffsz += io_vector[i++].iov_len; + } + io_vector[i].iov_base = nullbuff; io_vector[i++].iov_len = 1; buffsz += io_vector[i-1].iov_len; @@ -765,9 +775,14 @@ static ErlDrvData spawn_start(ErlDrvPort port_num, char* name, if (res < (buffsz + sizeof(buffsz))) { /* we only wrote part of the command payload. Enqueue the rest. */ for (i = 0; i < iov_len; i++) { - driver_enq(port_num, io_vector[i].iov_base, io_vector[i].iov_len); + if (res >= io_vector[i].iov_len) + res -= io_vector[i].iov_len; + else { + driver_enq(port_num, io_vector[i].iov_base + res, + io_vector[i].iov_len - res); + res = 0; + } } - driver_deq(port_num, res); driver_select(port_num, ofd[1], ERL_DRV_WRITE|ERL_DRV_USE, 1); } |