1 /* execve() function: Execute a program, replacing the current process. 2 Copyright (C) 2020-2021 Free Software Foundation, Inc. 3 4 This file is free software: you can redistribute it and/or modify 5 it under the terms of the GNU Lesser General Public License as 6 published by the Free Software Foundation; either version 2.1 of the 7 License, or (at your option) any later version. 8 9 This file is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 GNU Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public License 15 along with this program. If not, see <https://www.gnu.org/licenses/>. */ 16 17 /* Written by Bruno Haible <bruno@clisp.org>, 2020. */ 18 19 /* Don't use __attribute__ __nonnull__ in this compilation unit. Otherwise gcc 20 may optimize away the program == NULL and argv == NULL tests below. */ 21 #define _GL_ARG_NONNULL(params) 22 23 #include <config.h> 24 25 /* Specification. */ 26 #include <unistd.h> 27 28 #if defined _WIN32 && !defined __CYGWIN__ 29 30 # include <errno.h> 31 # include <stdio.h> 32 # include <spawn.h> 33 34 # include <sys/types.h> 35 # include <sys/wait.h> 36 37 int 38 execve (const char *program, char * const *argv, char * const *env) /* */ 39 { 40 if (program == NULL 41 || argv == NULL 42 /* The callee is not expecting a NULL argv[0]. */ 43 || argv[0] == NULL 44 || env == NULL) 45 { 46 errno = EINVAL; 47 return -1; 48 } 49 50 pid_t child; 51 int err = posix_spawn (&child, program, NULL, NULL, argv, env); 52 if (err == 0) 53 { 54 /* Close all file descriptors, so that 55 - for opened files, the child may close and unlink() the file, 56 - for pipe handles, the pipe's reader or writer does not get stuck. 57 Ideally we would also suspend all other threads and close all other 58 HANDLEs (not associated with file descriptors) and SOCKETs, but we 59 can't do so since we have no way to enumerate them. */ 60 { 61 unsigned int fdmax = _getmaxstdio (); 62 unsigned int fd; 63 for (fd = 0; fd < fdmax; fd++) 64 close (fd); 65 } 66 67 /* Wait until the child process is terminated. */ 68 int status = 127; 69 waitpid (child, &status, 0); 70 int exitcode = status; 71 72 /* Pass its exit code to the parent process. */ 73 _exit (exitcode); 74 } 75 errno = err; 76 return -1; 77 } 78 79 #endif