/* Utilities to execute a program in a subprocess (possibly linked by pipes with other subprocesses), and wait for it. DJGPP specialization. Copyright (C) 1996-2017 Free Software Foundation, Inc. This file is part of the libiberty library. Libiberty is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. Libiberty 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with libiberty; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ #include "pex-common.h" #include #include #ifdef NEED_DECLARATION_ERRNO extern int errno; #endif #ifdef HAVE_STDLIB_H #include #endif #include #include #include #include #include /* Use ECHILD if available, otherwise use EINVAL. */ #ifdef ECHILD #define PWAIT_ERROR ECHILD #else #define PWAIT_ERROR EINVAL #endif static int pex_djgpp_open_read (struct pex_obj *, const char *, int); static int pex_djgpp_open_write (struct pex_obj *, const char *, int, int); static pid_t pex_djgpp_exec_child (struct pex_obj *, int, const char *, char * const *, char * const *, int, int, int, int, const char **, int *); static int pex_djgpp_close (struct pex_obj *, int); static pid_t pex_djgpp_wait (struct pex_obj *, pid_t, int *, struct pex_time *, int, const char **, int *); /* The list of functions we pass to the common routines. */ const struct pex_funcs funcs = { pex_djgpp_open_read, pex_djgpp_open_write, pex_djgpp_exec_child, pex_djgpp_close, pex_djgpp_wait, NULL, /* pipe */ NULL, /* fdopenr */ NULL, /* fdopenw */ NULL /* cleanup */ }; /* Return a newly initialized pex_obj structure. */ struct pex_obj * pex_init (int flags, const char *pname, const char *tempbase) { /* DJGPP does not support pipes. */ flags &= ~ PEX_USE_PIPES; return pex_init_common (flags, pname, tempbase, &funcs); } /* Open a file for reading. */ static int pex_djgpp_open_read (struct pex_obj *obj ATTRIBUTE_UNUSED, const char *name, int binary) { return open (name, O_RDONLY | (binary ? O_BINARY : O_TEXT)); } /* Open a file for writing. */ static int pex_djgpp_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED, const char *name, int binary, int append) { /* Note that we can't use O_EXCL here because gcc may have already created the temporary file via make_temp_file. */ if (append) return -1; return open (name, (O_WRONLY | O_CREAT | O_TRUNC | (binary ? O_BINARY : O_TEXT)), S_IRUSR | S_IWUSR); } /* Close a file. */ static int pex_djgpp_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd) { return close (fd); } /* Execute a child. */ static pid_t pex_djgpp_exec_child (struct pex_obj *obj, int flags, const char *executable, char * const * argv, char * const * env, int in, int out, int errdes, int toclose ATTRIBUTE_UNUSED, const char **errmsg, int *err) { int org_in, org_out, org_errdes; int status; int *statuses; org_in = -1; org_out = -1; org_errdes = -1; if (in != STDIN_FILE_NO) { org_in = dup (STDIN_FILE_NO); if (org_in < 0) { *err = errno; *errmsg = "dup"; return (pid_t) -1; } if (dup2 (in, STDIN_FILE_NO) < 0) { *err = errno; *errmsg = "dup2"; return (pid_t) -1; } if (close (in) < 0) { *err = errno; *errmsg = "close"; return (pid_t) -1; } } if (out != STDOUT_FILE_NO) { org_out = dup (STDOUT_FILE_NO); if (org_out < 0) { *err = errno; *errmsg = "dup"; return (pid_t) -1; } if (dup2 (out, STDOUT_FILE_NO) < 0) { *err = errno; *errmsg = "dup2"; return (pid_t) -1; } if (close (out) < 0) { *err = errno; *errmsg = "close"; return (pid_t) -1; } } if (errdes != STDERR_FILE_NO || (flags & PEX_STDERR_TO_STDOUT) != 0) { org_errdes = dup (STDERR_FILE_NO); if (org_errdes < 0) { *err = errno; *errmsg = "dup"; return (pid_t) -1; } if (dup2 ((flags & PEX_STDERR_TO_STDOUT) != 0 ? STDOUT_FILE_NO : errdes, STDERR_FILE_NO) < 0) { *err = errno; *errmsg = "dup2"; return (pid_t) -1; } if (errdes != STDERR_FILE_NO) { if (close (errdes) < 0) { *err = errno; *errmsg = "close"; return (pid_t) -1; } } } if (env) status = (((flags & PEX_SEARCH) != 0 ? spawnvpe : spawnve) (P_WAIT, executable, argv, env)); else status = (((flags & PEX_SEARCH) != 0 ? spawnvp : spawnv) (P_WAIT, executable, argv)); if (status == -1) { *err = errno; *errmsg = ((flags & PEX_SEARCH) != 0) ? "spawnvp" : "spawnv"; } if (in != STDIN_FILE_NO) { if (dup2 (org_in, STDIN_FILE_NO) < 0) { *err = errno; *errmsg = "dup2"; return (pid_t) -1; } if (close (org_in) < 0) { *err = errno; *errmsg = "close"; return (pid_t) -1; } } if (out != STDOUT_FILE_NO) { if (dup2 (org_out, STDOUT_FILE_NO) < 0) { *err = errno; *errmsg = "dup2"; return (pid_t) -1; } if (close (org_out) < 0) { *err = errno; *errmsg = "close"; return (pid_t) -1; } } if (errdes != STDERR_FILE_NO || (flags & PEX_STDERR_TO_STDOUT) != 0) { if (dup2 (org_errdes, STDERR_FILE_NO) < 0) { *err = errno; *errmsg = "dup2"; return (pid_t) -1; } if (close (org_errdes) < 0) { *err = errno; *errmsg = "close"; return (pid_t) -1; } } /* Save the exit status for later. When we are called, obj->count is the number of children which have executed before this one. */ statuses = (int *) obj->sysdep; statuses = XRESIZEVEC (int, statuses, obj->count + 1); statuses[obj->count] = status; obj->sysdep = (void *) statuses; return (pid_t) obj->count; } /* Wait for a child process to complete. Actually the child process has already completed, and we just need to return the exit status. */ static pid_t pex_djgpp_wait (struct pex_obj *obj, pid_t pid, int *status, struct pex_time *time, int done ATTRIBUTE_UNUSED, const char **errmsg ATTRIBUTE_UNUSED, int *err ATTRIBUTE_UNUSED) { int *statuses; if (time != NULL) memset (time, 0, sizeof *time); statuses = (int *) obj->sysdep; *status = statuses[pid]; return 0; }