1 /* vi: set sw=4 ts=4: */
5 * Copyright (C) 2006 Gabriel Somlo <somlo at cmu.edu>
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
12 /* check if path points to an executable file;
16 int FAST_FUNC
execable_file(const char *name
)
19 return (!access(name
, X_OK
) && !stat(name
, &s
) && S_ISREG(s
.st_mode
));
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
26 * you may call find_execable again with this PATHp to continue
28 * return NULL otherwise; (PATHp is undefined)
29 * in all cases (*PATHp) contents will be trashed (s/:/NUL/).
31 char* FAST_FUNC
find_execable(const char *filename
, char **PATHp
)
40 if (*p
!= '\0') { /* it's not a PATH="foo::bar" situation */
41 p
= concat_path_file(p
, filename
);
42 if (execable_file(p
)) {
49 } /* on loop exit p == NULL */
53 /* search $PATH for an executable file;
57 int FAST_FUNC
exists_execable(const char *filename
)
59 char *path
= xstrdup(getenv("PATH"));
61 char *ret
= find_execable(filename
, &tmp
);
70 #if ENABLE_FEATURE_PREFER_APPLETS
71 /* just like the real execvp, but try to launch an applet named 'file' first */
72 int FAST_FUNC
BB_EXECVP(const char *file
, char *const argv
[])
74 if (find_applet_by_name(file
) >= 0)
75 execvp(bb_busybox_exec_path
, argv
);
76 return execvp(file
, argv
);
80 int FAST_FUNC
BB_EXECVP_or_die(char **argv
)
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]);