Alejandro ColomarandSerge Hallyn
62172f6fb5
In variadic functions we still do the cast. In POSIX, it's not necessary, since NULL is required to be of type 'void *', and 'void *' is guaranteed to have the same alignment and representation as 'char *'. However, since ISO C still doesn't mandate that, and moreover they're doing dubious stuff by adding nullptr, let's be on the cautious side. Also, C++ requires that NULL is _not_ 'void *', but either plain 0 or some magic stuff. Signed-off-by: Alejandro Colomar <alx@kernel.org>
81 lines
1.9 KiB
C
81 lines
1.9 KiB
C
/*
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* SPDX-FileCopyrightText: 1989 - 1991, Julianne Frances Haugh
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* SPDX-FileCopyrightText: 1996 - 1998, Marek Michałkiewicz
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* SPDX-FileCopyrightText: 2003 - 2006, Tomasz Kłoczko
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* SPDX-FileCopyrightText: 2009 , Nicolas François
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <config.h>
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#ident "$Id$"
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#include <stdio.h>
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#include <errno.h>
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#include "prototypes.h"
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#include "defines.h"
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extern char **newenvp;
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extern size_t newenvc;
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/*
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* shell - execute the named program
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*
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* shell begins by trying to figure out what argv[0] is going to
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* be for the named process. The user may pass in that argument,
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* or it will be the last pathname component of the file with a
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* '-' prepended.
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* Then, it executes the named file.
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*/
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int shell (const char *file, /*@null@*/const char *arg, char *const envp[])
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{
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char arg0[1024];
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int err;
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if (file == NULL) {
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errno = EINVAL;
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return errno;
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}
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/*
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* The argv[0]'th entry is usually the path name, but
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* for various reasons the invoker may want to override
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* that. So, we determine the 0'th entry only if they
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* don't want to tell us what it is themselves.
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*/
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if (arg == NULL) {
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(void) snprintf (arg0, sizeof arg0, "-%s", Basename (file));
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arg0[sizeof arg0 - 1] = '\0';
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arg = arg0;
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}
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/*
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* First we try the direct approach. The system should be
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* able to figure out what we are up to without too much
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* grief.
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*/
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(void) execle (file, arg, (char *) NULL, envp);
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err = errno;
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if (access (file, R_OK|X_OK) == 0) {
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/*
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* Assume this is a shell script (with no shebang).
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* Interpret it with /bin/sh
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*/
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(void) execle (SHELL, "sh", "-", file, (char *) NULL, envp);
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err = errno;
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}
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/*
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* Obviously something is really wrong - I can't figure out
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* how to execute this stupid shell, so I might as well give
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* up in disgust ...
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*/
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(void) snprintf (arg0, sizeof arg0, _("Cannot execute %s"), file);
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errno = err;
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perror (arg0);
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return err;
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}
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