Mercurial > gnulib
view m4/posix_spawn.m4 @ 40177:dcd889592b62
dtoastr,ftoastr,ldtoastr: port to c-strtod changes
Decouple these modules from c-strtod. Nowadays it’s reasonable to
assume the C99 signatures for strtod and strtold. Programs that
require stricter adherence to C99 should also use the strtod and
strtold modules as needed, and we no longer need the
HAVE_C99_STRTOLD macro.
* NEWS: Mention this.
* lib/ftoastr.c (STRTOF) [LENGTH == 3]: Assume strtold.
* m4/c-strtod.m4 (gl_C_STRTOLD): Do not define HAVE_C99_STRTOLD.
* modules/dtoastr, modules/ftoastr, modules/ldtoastr:
(Files): Remove m4/c-strtod.m4.
(configure.ac): Do not require gl_C99_STRTOLD, which no longer
exists.
author | Paul Eggert <eggert@cs.ucla.edu> |
---|---|
date | Sat, 02 Feb 2019 13:01:55 -0800 |
parents | b06060465f09 |
children |
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# posix_spawn.m4 serial 15 dnl Copyright (C) 2008-2019 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. dnl Tests whether the entire posix_spawn facility is available. AC_DEFUN([gl_POSIX_SPAWN], [ AC_REQUIRE([gl_POSIX_SPAWN_BODY]) ]) AC_DEFUN([gl_POSIX_SPAWN_BODY], [ AC_REQUIRE([gl_SPAWN_H_DEFAULTS]) AC_REQUIRE([gl_HAVE_POSIX_SPAWN]) dnl Assume that when the main function exists, all the others, dnl except posix_spawnattr_{get,set}sched*, are available as well. dnl AC_CHECK_FUNCS_ONCE([posix_spawnp]) dnl AC_CHECK_FUNCS_ONCE([posix_spawn_file_actions_init]) dnl AC_CHECK_FUNCS_ONCE([posix_spawn_file_actions_addclose]) dnl AC_CHECK_FUNCS_ONCE([posix_spawn_file_actions_adddup2]) dnl AC_CHECK_FUNCS_ONCE([posix_spawn_file_actions_addopen]) dnl AC_CHECK_FUNCS_ONCE([posix_spawn_file_actions_destroy]) dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_init]) dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_getflags]) dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_setflags]) dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_getpgroup]) dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_setpgroup]) dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_getsigdefault]) dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_setsigdefault]) dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_getsigmask]) dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_setsigmask]) dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_destroy]) if test $ac_cv_func_posix_spawn = yes; then m4_ifdef([gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDCHDIR], [dnl Module 'posix_spawn_file_actions_addchdir' is present. AC_CHECK_FUNCS_ONCE([posix_spawn_file_actions_addchdir_np]) if test $ac_cv_func_posix_spawn_file_actions_addchdir_np = no; then dnl In order to implement the posix_spawn_file_actions_addchdir dnl function, we need to replace the entire posix_spawn facility. REPLACE_POSIX_SPAWN=1 fi ]) if test $REPLACE_POSIX_SPAWN = 0; then gl_POSIX_SPAWN_WORKS case "$gl_cv_func_posix_spawn_works" in *yes) dnl Assume that these functions are available if POSIX_SPAWN_SETSCHEDULER dnl evaluates to nonzero. dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_getschedpolicy]) dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_setschedpolicy]) AC_CACHE_CHECK([whether posix_spawnattr_setschedpolicy is supported], [gl_cv_func_spawnattr_setschedpolicy], [AC_EGREP_CPP([POSIX scheduling supported], [ #include <spawn.h> #if POSIX_SPAWN_SETSCHEDULER POSIX scheduling supported #endif ], [gl_cv_func_spawnattr_setschedpolicy=yes], [gl_cv_func_spawnattr_setschedpolicy=no]) ]) dnl Assume that these functions are available if POSIX_SPAWN_SETSCHEDPARAM dnl evaluates to nonzero. dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_getschedparam]) dnl AC_CHECK_FUNCS_ONCE([posix_spawnattr_setschedparam]) AC_CACHE_CHECK([whether posix_spawnattr_setschedparam is supported], [gl_cv_func_spawnattr_setschedparam], [AC_EGREP_CPP([POSIX scheduling supported], [ #include <spawn.h> #if POSIX_SPAWN_SETSCHEDPARAM POSIX scheduling supported #endif ], [gl_cv_func_spawnattr_setschedparam=yes], [gl_cv_func_spawnattr_setschedparam=no]) ]) ;; *) REPLACE_POSIX_SPAWN=1 ;; esac fi fi if test $ac_cv_func_posix_spawn != yes || test $REPLACE_POSIX_SPAWN = 1; then AC_DEFINE([REPLACE_POSIX_SPAWN], [1], [Define if gnulib uses its own posix_spawn and posix_spawnp functions.]) fi ]) dnl Test whether posix_spawn actually works. dnl posix_spawn on AIX 5.3..6.1 has two bugs: dnl 1) When it fails to execute the program, the child process exits with dnl exit() rather than _exit(), which causes the stdio buffers to be dnl flushed. Reported by Rainer Tammer. dnl 2) The posix_spawn_file_actions_addopen function does not support file dnl names that contain a '*'. dnl posix_spawn on AIX 5.3..6.1 has also a third bug: It does not work dnl when POSIX threads are used. But we don't test against this bug here. AC_DEFUN([gl_POSIX_SPAWN_WORKS], [ AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether posix_spawn works], [gl_cv_func_posix_spawn_works], [if test $cross_compiling = no; then AC_LINK_IFELSE([AC_LANG_SOURCE([[ #include <errno.h> #include <fcntl.h> #include <signal.h> #include <spawn.h> #include <stdbool.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/types.h> #include <sys/wait.h> extern char **environ; #ifndef STDIN_FILENO # define STDIN_FILENO 0 #endif #ifndef STDOUT_FILENO # define STDOUT_FILENO 1 #endif #ifndef STDERR_FILENO # define STDERR_FILENO 2 #endif #ifndef WTERMSIG # define WTERMSIG(x) ((x) & 0x7f) #endif #ifndef WIFEXITED # define WIFEXITED(x) (WTERMSIG (x) == 0) #endif #ifndef WEXITSTATUS # define WEXITSTATUS(x) (((x) >> 8) & 0xff) #endif #define CHILD_PROGRAM_FILENAME "/non/exist/ent" static int fd_safer (int fd) { if (0 <= fd && fd <= 2) { int f = fd_safer (dup (fd)); int e = errno; close (fd); errno = e; fd = f; } return fd; } int main () { char *argv[2] = { CHILD_PROGRAM_FILENAME, NULL }; int ofd[2]; sigset_t blocked_signals; sigset_t fatal_signal_set; posix_spawn_file_actions_t actions; bool actions_allocated; posix_spawnattr_t attrs; bool attrs_allocated; int err; pid_t child; int status; int exitstatus; setvbuf (stdout, NULL, _IOFBF, 0); puts ("This should be seen only once."); if (pipe (ofd) < 0 || (ofd[1] = fd_safer (ofd[1])) < 0) { perror ("cannot create pipe"); exit (1); } sigprocmask (SIG_SETMASK, NULL, &blocked_signals); sigemptyset (&fatal_signal_set); sigaddset (&fatal_signal_set, SIGINT); sigaddset (&fatal_signal_set, SIGTERM); sigaddset (&fatal_signal_set, SIGHUP); sigaddset (&fatal_signal_set, SIGPIPE); sigprocmask (SIG_BLOCK, &fatal_signal_set, NULL); actions_allocated = false; attrs_allocated = false; if ((err = posix_spawn_file_actions_init (&actions)) != 0 || (actions_allocated = true, (err = posix_spawn_file_actions_adddup2 (&actions, ofd[0], STDIN_FILENO)) != 0 || (err = posix_spawn_file_actions_addclose (&actions, ofd[0])) != 0 || (err = posix_spawn_file_actions_addclose (&actions, ofd[1])) != 0 || (err = posix_spawnattr_init (&attrs)) != 0 || (attrs_allocated = true, (err = posix_spawnattr_setsigmask (&attrs, &blocked_signals)) != 0 || (err = posix_spawnattr_setflags (&attrs, POSIX_SPAWN_SETSIGMASK)) != 0) || (err = posix_spawnp (&child, CHILD_PROGRAM_FILENAME, &actions, &attrs, argv, environ)) != 0)) { if (actions_allocated) posix_spawn_file_actions_destroy (&actions); if (attrs_allocated) posix_spawnattr_destroy (&attrs); sigprocmask (SIG_UNBLOCK, &fatal_signal_set, NULL); if (err == ENOENT) return 0; else { errno = err; perror ("subprocess failed"); exit (1); } } posix_spawn_file_actions_destroy (&actions); posix_spawnattr_destroy (&attrs); sigprocmask (SIG_UNBLOCK, &fatal_signal_set, NULL); close (ofd[0]); close (ofd[1]); status = 0; while (waitpid (child, &status, 0) != child) ; if (!WIFEXITED (status)) { fprintf (stderr, "subprocess terminated with unexpected wait status %d\n", status); exit (1); } exitstatus = WEXITSTATUS (status); if (exitstatus != 127) { fprintf (stderr, "subprocess terminated with unexpected exit status %d\n", exitstatus); exit (1); } return 0; } ]])], [if test -s conftest$ac_exeext \ && ./conftest$ac_exeext > conftest.out \ && echo 'This should be seen only once.' > conftest.ok \ && cmp conftest.out conftest.ok >/dev/null 2>&1; then gl_cv_func_posix_spawn_works=yes else gl_cv_func_posix_spawn_works=no fi], [gl_cv_func_posix_spawn_works=no]) if test $gl_cv_func_posix_spawn_works = yes; then AC_RUN_IFELSE([AC_LANG_SOURCE([[ /* Test whether posix_spawn_file_actions_addopen supports filename arguments that contain special characters such as '*'. */ #include <errno.h> #include <fcntl.h> #include <signal.h> #include <spawn.h> #include <stdbool.h> #include <stdio.h> #include <string.h> #include <unistd.h> #include <sys/types.h> #include <sys/wait.h> extern char **environ; #ifndef STDIN_FILENO # define STDIN_FILENO 0 #endif #ifndef STDOUT_FILENO # define STDOUT_FILENO 1 #endif #ifndef STDERR_FILENO # define STDERR_FILENO 2 #endif #ifndef WTERMSIG # define WTERMSIG(x) ((x) & 0x7f) #endif #ifndef WIFEXITED # define WIFEXITED(x) (WTERMSIG (x) == 0) #endif #ifndef WEXITSTATUS # define WEXITSTATUS(x) (((x) >> 8) & 0xff) #endif #define CHILD_PROGRAM_FILENAME "conftest" #define DATA_FILENAME "conftest%=*#?" static int parent_main (void) { FILE *fp; char *argv[3] = { CHILD_PROGRAM_FILENAME, "-child", NULL }; posix_spawn_file_actions_t actions; bool actions_allocated; int err; pid_t child; int status; int exitstatus; /* Create a data file with specific contents. */ fp = fopen (DATA_FILENAME, "wb"); if (fp == NULL) { perror ("cannot create data file"); return 1; } fwrite ("Halle Potta", 1, 11, fp); if (fflush (fp) || fclose (fp)) { perror ("cannot prepare data file"); return 2; } /* Avoid reading from our stdin, as it could block. */ freopen ("/dev/null", "rb", stdin); /* Test whether posix_spawn_file_actions_addopen with this file name actually works, but spawning a child that reads from this file. */ actions_allocated = false; if ((err = posix_spawn_file_actions_init (&actions)) != 0 || (actions_allocated = true, (err = posix_spawn_file_actions_addopen (&actions, STDIN_FILENO, DATA_FILENAME, O_RDONLY, 0600)) != 0 || (err = posix_spawn (&child, CHILD_PROGRAM_FILENAME, &actions, NULL, argv, environ)) != 0)) { if (actions_allocated) posix_spawn_file_actions_destroy (&actions); errno = err; perror ("subprocess failed"); return 3; } posix_spawn_file_actions_destroy (&actions); status = 0; while (waitpid (child, &status, 0) != child) ; if (!WIFEXITED (status)) { fprintf (stderr, "subprocess terminated with unexpected wait status %d\n", status); return 4; } exitstatus = WEXITSTATUS (status); if (exitstatus != 0) { fprintf (stderr, "subprocess terminated with unexpected exit status %d\n", exitstatus); return 5; } return 0; } static int child_main (void) { char buf[1024]; /* See if reading from STDIN_FILENO yields the expected contents. */ if (fread (buf, 1, sizeof (buf), stdin) == 11 && memcmp (buf, "Halle Potta", 11) == 0) return 0; else return 8; } static void cleanup_then_die (int sig) { /* Clean up data file. */ unlink (DATA_FILENAME); /* Re-raise the signal and die from it. */ signal (sig, SIG_DFL); raise (sig); } int main (int argc, char *argv[]) { int exitstatus; if (!(argc > 1 && strcmp (argv[1], "-child") == 0)) { /* This is the parent process. */ signal (SIGINT, cleanup_then_die); signal (SIGTERM, cleanup_then_die); #ifdef SIGHUP signal (SIGHUP, cleanup_then_die); #endif exitstatus = parent_main (); } else { /* This is the child process. */ exitstatus = child_main (); } unlink (DATA_FILENAME); return exitstatus; } ]])], [], [gl_cv_func_posix_spawn_works=no]) fi else case "$host_os" in aix*) gl_cv_func_posix_spawn_works="guessing no";; *) gl_cv_func_posix_spawn_works="guessing yes";; esac fi ]) ]) # Prerequisites of lib/spawni.c. AC_DEFUN([gl_PREREQ_POSIX_SPAWN_INTERNAL], [ AC_CHECK_HEADERS([paths.h]) AC_CHECK_FUNCS([confstr sched_setparam sched_setscheduler setegid seteuid vfork]) ]) AC_DEFUN([gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDCLOSE], [ AC_REQUIRE([gl_SPAWN_H_DEFAULTS]) AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles gl_POSIX_SPAWN if test $REPLACE_POSIX_SPAWN = 1; then REPLACE_POSIX_SPAWN_FILE_ACTIONS_ADDCLOSE=1 else dnl On Solaris 11.0, posix_spawn_file_actions_addclose succeeds even dnl if the fd argument is out of range. AC_CACHE_CHECK([whether posix_spawn_file_actions_addclose works], [gl_cv_func_posix_spawn_file_actions_addclose_works], [AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #include <spawn.h> int main () { posix_spawn_file_actions_t actions; if (posix_spawn_file_actions_init (&actions) != 0) return 1; if (posix_spawn_file_actions_addclose (&actions, 10000000) == 0) return 2; return 0; }]])], [gl_cv_func_posix_spawn_file_actions_addclose_works=yes], [gl_cv_func_posix_spawn_file_actions_addclose_works=no], [# Guess no on Solaris, yes otherwise. case "$host_os" in solaris*) gl_cv_func_posix_spawn_file_actions_addclose_works="guessing no" ;; # Guess no on native Windows. mingw*) gl_cv_func_posix_spawn_file_actions_addclose_works="guessing no" ;; *) gl_cv_func_posix_spawn_file_actions_addclose_works="guessing yes" ;; esac ]) ]) case "$gl_cv_func_posix_spawn_file_actions_addclose_works" in *yes) ;; *) REPLACE_POSIX_SPAWN_FILE_ACTIONS_ADDCLOSE=1 ;; esac fi ]) AC_DEFUN([gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDDUP2], [ AC_REQUIRE([gl_SPAWN_H_DEFAULTS]) AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles gl_POSIX_SPAWN if test $REPLACE_POSIX_SPAWN = 1; then REPLACE_POSIX_SPAWN_FILE_ACTIONS_ADDDUP2=1 else dnl On Solaris 11.0, posix_spawn_file_actions_adddup2 succeeds even dnl if the fd argument is out of range. AC_CACHE_CHECK([whether posix_spawn_file_actions_adddup2 works], [gl_cv_func_posix_spawn_file_actions_adddup2_works], [AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #include <spawn.h> int main () { posix_spawn_file_actions_t actions; if (posix_spawn_file_actions_init (&actions) != 0) return 1; if (posix_spawn_file_actions_adddup2 (&actions, 10000000, 2) == 0) return 2; return 0; }]])], [gl_cv_func_posix_spawn_file_actions_adddup2_works=yes], [gl_cv_func_posix_spawn_file_actions_adddup2_works=no], [# Guess no on Solaris, yes otherwise. case "$host_os" in solaris*) gl_cv_func_posix_spawn_file_actions_adddup2_works="guessing no";; # Guess no on native Windows. mingw*) gl_cv_func_posix_spawn_file_actions_adddup2_works="guessing no" ;; *) gl_cv_func_posix_spawn_file_actions_adddup2_works="guessing yes";; esac ]) ]) case "$gl_cv_func_posix_spawn_file_actions_adddup2_works" in *yes) ;; *) REPLACE_POSIX_SPAWN_FILE_ACTIONS_ADDDUP2=1 ;; esac fi ]) AC_DEFUN([gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDOPEN], [ AC_REQUIRE([gl_SPAWN_H_DEFAULTS]) AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles gl_POSIX_SPAWN if test $REPLACE_POSIX_SPAWN = 1; then REPLACE_POSIX_SPAWN_FILE_ACTIONS_ADDOPEN=1 else dnl On Solaris 11.0, posix_spawn_file_actions_addopen succeeds even dnl if the fd argument is out of range. AC_CACHE_CHECK([whether posix_spawn_file_actions_addopen works], [gl_cv_func_posix_spawn_file_actions_addopen_works], [AC_RUN_IFELSE( [AC_LANG_SOURCE([[ #include <spawn.h> #include <fcntl.h> int main () { posix_spawn_file_actions_t actions; if (posix_spawn_file_actions_init (&actions) != 0) return 1; if (posix_spawn_file_actions_addopen (&actions, 10000000, "foo", 0, O_RDONLY) == 0) return 2; return 0; }]])], [gl_cv_func_posix_spawn_file_actions_addopen_works=yes], [gl_cv_func_posix_spawn_file_actions_addopen_works=no], [# Guess no on Solaris, yes otherwise. case "$host_os" in solaris*) gl_cv_func_posix_spawn_file_actions_addopen_works="guessing no";; # Guess no on native Windows. mingw*) gl_cv_func_posix_spawn_file_actions_addopen_works="guessing no" ;; *) gl_cv_func_posix_spawn_file_actions_addopen_works="guessing yes";; esac ]) ]) case "$gl_cv_func_posix_spawn_file_actions_addopen_works" in *yes) ;; *) REPLACE_POSIX_SPAWN_FILE_ACTIONS_ADDOPEN=1 ;; esac fi ])