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-rw-r--r--third-party/execvpe/execvpe.c208
1 files changed, 208 insertions, 0 deletions
diff --git a/third-party/execvpe/execvpe.c b/third-party/execvpe/execvpe.c
new file mode 100644
index 0000000..d985df2
--- /dev/null
+++ b/third-party/execvpe/execvpe.c
@@ -0,0 +1,208 @@
+/* Copyright (C) 1991,92, 1995-99, 2002, 2004, 2005, 2007, 2009
+ Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__)
+#include <alloca.h>
+#endif /* !__FreeBSD__ && !__OpenBSD__ && !__NetBSD__ */
+#include <unistd.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include "execvpe.h"
+
+#if !defined(_MSC_VER) && !defined(HAVE_EXECVPE)
+
+/* The file is accessible but it is not an executable file. Invoke
+ the shell to interpret it as a script. */
+static void
+scripts_argv (const char *file, char *const argv[], int argc, char **new_argv)
+{
+ /* Construct an argument list for the shell. */
+ new_argv[0] = (char *) "/bin/sh";
+ new_argv[1] = (char *) file;
+ while (argc > 1)
+ {
+ new_argv[argc] = argv[argc - 1];
+ --argc;
+ }
+}
+
+
+/* Execute FILE, searching in the `PATH' environment variable if it contains
+ no slashes, with arguments ARGV and environment from ENVP. */
+int
+icinga2_execvpe (file, argv, envp)
+ const char *file;
+ char *const argv[];
+ char *const envp[];
+{
+ if (*file == '\0')
+ {
+ /* We check the simple case first. */
+ errno = ENOENT;
+ return -1;
+ }
+
+ if (strchr (file, '/') != NULL)
+ {
+ /* Don't search when it contains a slash. */
+ execve (file, argv, envp);
+
+ if (errno == ENOEXEC)
+ {
+ /* Count the arguments. */
+ int argc = 0;
+ while (argv[argc++])
+ ;
+ size_t len = (argc + 1) * sizeof (char *);
+ char **script_argv;
+ void *ptr = NULL;
+ script_argv = alloca (len);
+
+ if (script_argv != NULL)
+ {
+ scripts_argv (file, argv, argc, script_argv);
+ execve (script_argv[0], script_argv, envp);
+
+ free (ptr);
+ }
+ }
+ }
+ else
+ {
+ size_t pathlen;
+ size_t alloclen = 0;
+ char *path = getenv ("PATH");
+ if (path == NULL)
+ {
+ pathlen = confstr (_CS_PATH, (char *) NULL, 0);
+ alloclen = pathlen + 1;
+ }
+ else
+ pathlen = strlen (path);
+
+ size_t len = strlen (file) + 1;
+ alloclen += pathlen + len + 1;
+
+ char *name;
+ name = alloca (alloclen);
+
+ if (path == NULL)
+ {
+ /* There is no `PATH' in the environment.
+ The default search path is the current directory
+ followed by the path `confstr' returns for `_CS_PATH'. */
+ path = name + pathlen + len + 1;
+ path[0] = ':';
+ (void) confstr (_CS_PATH, path + 1, pathlen);
+ }
+
+ /* Copy the file name at the top. */
+ name = (char *) memcpy (name + pathlen + 1, file, len);
+ /* And add the slash. */
+ *--name = '/';
+
+ char **script_argv = NULL;
+ bool got_eacces = false;
+ char *p = path;
+ do
+ {
+ char *startp;
+
+ path = p;
+ p = strchr (path, ':');
+ if (!p)
+ p = path + strlen(path);
+
+ if (p == path)
+ /* Two adjacent colons, or a colon at the beginning or the end
+ of `PATH' means to search the current directory. */
+ startp = name + 1;
+ else
+ startp = (char *) memcpy (name - (p - path), path, p - path);
+
+ /* Try to execute this name. If it works, execve will not return. */
+ execve (startp, argv, envp);
+
+ if (errno == ENOEXEC)
+ {
+ if (script_argv == NULL)
+ {
+ /* Count the arguments. */
+ int argc = 0;
+ while (argv[argc++])
+ ;
+ size_t arglen = (argc + 1) * sizeof (char *);
+ script_argv = alloca (arglen);
+ if (script_argv == NULL)
+ {
+ /* A possible EACCES error is not as important as
+ the ENOMEM. */
+ got_eacces = false;
+ break;
+ }
+ scripts_argv (startp, argv, argc, script_argv);
+ }
+
+ execve (script_argv[0], script_argv, envp);
+ }
+
+ switch (errno)
+ {
+ case EACCES:
+ /* Record the we got a `Permission denied' error. If we end
+ up finding no executable we can use, we want to diagnose
+ that we did find one but were denied access. */
+ got_eacces = true;
+ case ENOENT:
+ case ESTALE:
+ case ENOTDIR:
+ /* Those errors indicate the file is missing or not executable
+ by us, in which case we want to just try the next path
+ directory. */
+ case ENODEV:
+ case ETIMEDOUT:
+ /* Some strange filesystems like AFS return even
+ stranger error numbers. They cannot reasonably mean
+ anything else so ignore those, too. */
+ break;
+
+ default:
+ /* Some other error means we found an executable file, but
+ something went wrong executing it; return the error to our
+ caller. */
+ return -1;
+ }
+ }
+ while (*p++ != '\0');
+
+ /* We tried every element and none of them worked. */
+ if (got_eacces)
+ /* At least one failure was due to permissions, so report that
+ error. */
+ errno = EACCES;
+ }
+
+ /* Return the error from the last attempt (probably ENOENT). */
+ return -1;
+}
+
+#endif /* !defined(_MSC_VER) && !defined(HAVE_EXECVPE) */