Annotation of /trunk/mkinitrd-magellan/klibc/usr/klibc/execvpe.c
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Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
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Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
File MIME type: text/plain
File size: 1952 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
1 | niro | 532 | /* |
2 | * execvpe.c | ||
3 | * | ||
4 | * execvpe() function (from which we build execlp, execlpe, execvp). | ||
5 | * | ||
6 | * This version of execvpe() will *not* spawn /bin/sh if the command | ||
7 | * return ENOEXEC. That's what #! is for, folks! | ||
8 | * | ||
9 | * Since execlpe() and execvpe() aren't in POSIX, nor in glibc, | ||
10 | * I have followed QNX precedent in the implementation of the PATH: | ||
11 | * the PATH that is used is the one in the current environment, not | ||
12 | * in the new environment. Otherwise it would be impossible to pass | ||
13 | * a different PATH to the new process than the one one would want to | ||
14 | * use to search. | ||
15 | */ | ||
16 | |||
17 | #include <errno.h> | ||
18 | #include <unistd.h> | ||
19 | #include <stdlib.h> | ||
20 | #include <string.h> | ||
21 | #include <limits.h> | ||
22 | |||
23 | #define DEFAULT_PATH "/bin:/usr/bin:." | ||
24 | |||
25 | int execvpe(const char *file, char *const *argv, char *const *envp) | ||
26 | { | ||
27 | char path[PATH_MAX]; | ||
28 | const char *searchpath, *esp; | ||
29 | size_t prefixlen, filelen, totallen; | ||
30 | |||
31 | if (strchr(file, '/')) /* Specific path */ | ||
32 | return execve(file, argv, envp); | ||
33 | |||
34 | filelen = strlen(file); | ||
35 | |||
36 | searchpath = getenv("PATH"); | ||
37 | if (!searchpath) | ||
38 | searchpath = DEFAULT_PATH; | ||
39 | |||
40 | errno = ENOENT; /* Default errno, if execve() doesn't | ||
41 | change it */ | ||
42 | |||
43 | do { | ||
44 | esp = strchr(searchpath, ':'); | ||
45 | if (esp) | ||
46 | prefixlen = esp - searchpath; | ||
47 | else | ||
48 | prefixlen = strlen(searchpath); | ||
49 | |||
50 | if (prefixlen == 0 || searchpath[prefixlen - 1] == '/') { | ||
51 | totallen = prefixlen + filelen; | ||
52 | if (totallen >= PATH_MAX) | ||
53 | continue; | ||
54 | memcpy(path, searchpath, prefixlen); | ||
55 | memcpy(path + prefixlen, file, filelen); | ||
56 | } else { | ||
57 | totallen = prefixlen + filelen + 1; | ||
58 | if (totallen >= PATH_MAX) | ||
59 | continue; | ||
60 | memcpy(path, searchpath, prefixlen); | ||
61 | path[prefixlen] = '/'; | ||
62 | memcpy(path + prefixlen + 1, file, filelen); | ||
63 | } | ||
64 | path[totallen] = '\0'; | ||
65 | |||
66 | execve(path, argv, envp); | ||
67 | if (errno == E2BIG || errno == ENOEXEC || | ||
68 | errno == ENOMEM || errno == ETXTBSY) | ||
69 | break; /* Report this as an error, no more search */ | ||
70 | |||
71 | searchpath = esp + 1; | ||
72 | } while (esp); | ||
73 | |||
74 | return -1; | ||
75 | } |