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9#include "libbb.h"
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14
15int FAST_FUNC file_is_executable(const char *name)
16{
17 struct stat s;
18 return (!access(name, X_OK) && !stat(name, &s) && S_ISREG(s.st_mode));
19}
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31char* FAST_FUNC find_executable(const char *filename, char **PATHp)
32{
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41 char *p, *n;
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43 p = *PATHp;
44 while (p) {
45 int ex;
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47 n = strchr(p, ':');
48 if (n) *n = '\0';
49 p = concat_path_file(
50 p[0] ? p : ".",
51 filename
52 );
53 ex = file_is_executable(p);
54 if (n) *n++ = ':';
55 if (ex) {
56 *PATHp = n;
57 return p;
58 }
59 free(p);
60 p = n;
61 }
62 return p;
63}
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68
69int FAST_FUNC executable_exists(const char *filename)
70{
71 char *path = getenv("PATH");
72 char *ret = find_executable(filename, &path);
73 free(ret);
74 return ret != NULL;
75}
76
77#if ENABLE_FEATURE_PREFER_APPLETS
78
79int FAST_FUNC BB_EXECVP(const char *file, char *const argv[])
80{
81 if (find_applet_by_name(file) >= 0)
82 execvp(bb_busybox_exec_path, argv);
83 return execvp(file, argv);
84}
85#endif
86
87void FAST_FUNC BB_EXECVP_or_die(char **argv)
88{
89 BB_EXECVP(argv[0], argv);
90
91 xfunc_error_retval = (errno == ENOENT) ? 127 : 126;
92 bb_perror_msg_and_die("can't execute '%s'", argv[0]);
93}
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95
96void FAST_FUNC exec_prog_or_SHELL(char **argv)
97{
98 if (argv[0]) {
99 BB_EXECVP_or_die(argv);
100 }
101 run_shell(getenv("SHELL"), 1, NULL);
102}
103