diff options
Diffstat (limited to 'crypto/heimdal/lib/roken/simple_exec.c')
| -rw-r--r-- | crypto/heimdal/lib/roken/simple_exec.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/crypto/heimdal/lib/roken/simple_exec.c b/crypto/heimdal/lib/roken/simple_exec.c new file mode 100644 index 0000000..426f494 --- /dev/null +++ b/crypto/heimdal/lib/roken/simple_exec.c @@ -0,0 +1,171 @@ +/* + * Copyright (c) 1998, 1999 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * 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. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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. + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +RCSID("$Id: simple_exec.c,v 1.6 1999/12/02 16:58:52 joda Exp $"); +#endif + +#include <stdarg.h> +#include <stdlib.h> +#ifdef HAVE_SYS_TYPES_H +#include <sys/types.h> +#endif +#ifdef HAVE_SYS_WAIT_H +#include <sys/wait.h> +#endif +#ifdef HAVE_UNISTD_H +#include <unistd.h> +#endif +#include <errno.h> + +#include <roken.h> + +#define EX_NOEXEC 126 +#define EX_NOTFOUND 127 + +/* return values: + -1 on `unspecified' system errors + -2 on fork failures + -3 on waitpid errors + 0- is return value from subprocess + 126 if the program couldn't be executed + 127 if the program couldn't be found + 128- is 128 + signal that killed subprocess + */ + +static int +check_status(pid_t pid) +{ + while(1) { + int status; + + while(waitpid(pid, &status, 0) < 0) + if (errno != EINTR) + return -3; + if(WIFSTOPPED(status)) + continue; + if(WIFEXITED(status)) + return WEXITSTATUS(status); + if(WIFSIGNALED(status)) + return WTERMSIG(status) + 128; + } +} + +int +simple_execvp(const char *file, char *const args[]) +{ + pid_t pid = fork(); + switch(pid){ + case -1: + return -2; + case 0: + execvp(file, args); + exit((errno == ENOENT) ? EX_NOTFOUND : EX_NOEXEC); + default: + return check_status(pid); + } +} + +/* gee, I'd like a execvpe */ +int +simple_execve(const char *file, char *const args[], char *const envp[]) +{ + pid_t pid = fork(); + switch(pid){ + case -1: + return -2; + case 0: + execve(file, args, envp); + exit((errno == ENOENT) ? EX_NOTFOUND : EX_NOEXEC); + default: + return check_status(pid); + } +} + +static char ** +collect_args(va_list *ap) +{ + char **argv = NULL; + int argc = 0, i = 0; + do { + if(i == argc) { + /* realloc argv */ + char **tmp = realloc(argv, (argc + 5) * sizeof(*argv)); + if(tmp == NULL) { + errno = ENOMEM; + return NULL; + } + argv = tmp; + argc += 5; + } + argv[i++] = va_arg(*ap, char*); + } while(argv[i - 1] != NULL); + return argv; +} + +int +simple_execlp(const char *file, ...) +{ + va_list ap; + char **argv; + int ret; + + va_start(ap, file); + argv = collect_args(&ap); + va_end(ap); + if(argv == NULL) + return -1; + ret = simple_execvp(file, argv); + free(argv); + return ret; +} + +int +simple_execle(const char *file, ... /* ,char *const envp[] */) +{ + va_list ap; + char **argv; + char *const* envp; + int ret; + + va_start(ap, file); + argv = collect_args(&ap); + envp = va_arg(ap, char **); + va_end(ap); + if(argv == NULL) + return -1; + ret = simple_execve(file, argv, envp); + free(argv); + return ret; +} |
