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Diffstat (limited to '')
| -rw-r--r-- | libmisc/shell.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/libmisc/shell.c b/libmisc/shell.c new file mode 100644 index 0000000..92bfc2b --- /dev/null +++ b/libmisc/shell.c @@ -0,0 +1,103 @@ +/* + * Copyright (c) 1989 - 1991, Julianne Frances Haugh + * Copyright (c) 1996 - 1998, Marek Michałkiewicz + * Copyright (c) 2003 - 2006, Tomasz Kłoczko + * Copyright (c) 2009 , Nicolas François + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the copyright holders or contributors may not be used to + * endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A + * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <config.h> + +#ident "$Id$" + +#include <stdio.h> +#include <errno.h> +#include "prototypes.h" +#include "defines.h" +extern char **newenvp; +extern size_t newenvc; + +/* + * shell - execute the named program + * + * shell begins by trying to figure out what argv[0] is going to + * be for the named process. The user may pass in that argument, + * or it will be the last pathname component of the file with a + * '-' prepended. + * Then, it executes the named file. + */ + +int shell (const char *file, /*@null@*/const char *arg, char *const envp[]) +{ + char arg0[1024]; + int err; + + if (file == (char *) 0) { + errno = EINVAL; + return errno; + } + + /* + * The argv[0]'th entry is usually the path name, but + * for various reasons the invoker may want to override + * that. So, we determine the 0'th entry only if they + * don't want to tell us what it is themselves. + */ + if (arg == (char *) 0) { + (void) snprintf (arg0, sizeof arg0, "-%s", Basename ((char *) file)); + arg0[sizeof arg0 - 1] = '\0'; + arg = arg0; + } + + /* + * First we try the direct approach. The system should be + * able to figure out what we are up to without too much + * grief. + */ + (void) execle (file, arg, (char *) 0, envp); + err = errno; + + if (access (file, R_OK|X_OK) == 0) { + /* + * Assume this is a shell script (with no shebang). + * Interpret it with /bin/sh + */ + (void) execle (SHELL, "sh", "-", file, (char *)0, envp); + err = errno; + } + + /* + * Obviously something is really wrong - I can't figure out + * how to execute this stupid shell, so I might as well give + * up in disgust ... + */ + (void) snprintf (arg0, sizeof arg0, _("Cannot execute %s"), file); + errno = err; + perror (arg0); + return err; +} + |