source: branches/3.2/mindi-busybox/libbb/execable.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
  • Property svn:eol-style set to native
File size: 2.0 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Utility routines.
4 *
5 * Copyright (C) 2006 Gabriel Somlo <somlo at cmu.edu>
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
8 */
9
10#include "libbb.h"
11
12/* check if path points to an executable file;
13 * return 1 if found;
14 * return 0 otherwise;
15 */
16int FAST_FUNC execable_file(const char *name)
17{
18    struct stat s;
19    return (!access(name, X_OK) && !stat(name, &s) && S_ISREG(s.st_mode));
20}
21
22/* search (*PATHp) for an executable file;
23 * return allocated string containing full path if found;
24 *  PATHp points to the component after the one where it was found
25 *  (or NULL),
26 *  you may call find_execable again with this PATHp to continue
27 *  (if it's not NULL).
28 * return NULL otherwise; (PATHp is undefined)
29 * in all cases (*PATHp) contents will be trashed (s/:/NUL/).
30 */
31char* FAST_FUNC find_execable(const char *filename, char **PATHp)
32{
33    char *p, *n;
34
35    p = *PATHp;
36    while (p) {
37        n = strchr(p, ':');
38        if (n)
39            *n++ = '\0';
40        if (*p != '\0') { /* it's not a PATH="foo::bar" situation */
41            p = concat_path_file(p, filename);
42            if (execable_file(p)) {
43                *PATHp = n;
44                return p;
45            }
46            free(p);
47        }
48        p = n;
49    } /* on loop exit p == NULL */
50    return p;
51}
52
53/* search $PATH for an executable file;
54 * return 1 if found;
55 * return 0 otherwise;
56 */
57int FAST_FUNC exists_execable(const char *filename)
58{
59    char *path = xstrdup(getenv("PATH"));
60    char *tmp = path;
61    char *ret = find_execable(filename, &tmp);
62    free(path);
63    if (ret) {
64        free(ret);
65        return 1;
66    }
67    return 0;
68}
69
70#if ENABLE_FEATURE_PREFER_APPLETS
71/* just like the real execvp, but try to launch an applet named 'file' first */
72int FAST_FUNC BB_EXECVP(const char *file, char *const argv[])
73{
74    if (find_applet_by_name(file) >= 0)
75        execvp(bb_busybox_exec_path, argv);
76    return execvp(file, argv);
77}
78#endif
79
80int FAST_FUNC BB_EXECVP_or_die(char **argv)
81{
82    BB_EXECVP(argv[0], argv);
83    /* SUSv3-mandated exit codes */
84    xfunc_error_retval = (errno == ENOENT) ? 127 : 126;
85    bb_perror_msg_and_die("can't execute '%s'", argv[0]);
86}
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