Last change
on this file since 444 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
|
File size:
1.3 KB
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Rev | Line | |
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[444] | 1 | #ifndef _NO_EXECVE |
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| 2 | |
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| 3 | /* execvp.c */ |
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| 4 | |
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| 5 | /* This and the other exec*.c files in this directory require |
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| 6 | the target to provide the _execve syscall. */ |
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| 7 | |
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| 8 | #include <_ansi.h> |
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| 9 | #include <stdlib.h> |
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| 10 | #include <unistd.h> |
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| 11 | #include <dirent.h> |
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| 12 | #include <string.h> |
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| 13 | #include <errno.h> |
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| 14 | #include <ctype.h> |
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| 15 | |
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| 16 | #define PATH_DELIM ':' |
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| 17 | |
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| 18 | /* |
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| 19 | * Copy string, until c or <nul> is encountered. |
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| 20 | * NUL-terminate the destination string (s1). |
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| 21 | */ |
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| 22 | |
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| 23 | static char * |
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| 24 | strccpy (char *s1, |
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| 25 | char *s2, |
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| 26 | char c) |
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| 27 | { |
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| 28 | char *dest = s1; |
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| 29 | |
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| 30 | while (*s2 && *s2 != c) |
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| 31 | *s1++ = *s2++; |
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| 32 | *s1 = 0; |
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| 33 | |
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| 34 | return dest; |
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| 35 | } |
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| 36 | |
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| 37 | int |
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| 38 | execvp (const char *file, |
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| 39 | char * const argv[]) |
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| 40 | { |
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| 41 | char *path = getenv ("PATH"); |
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| 42 | char buf[MAXNAMLEN]; |
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| 43 | |
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| 44 | /* If $PATH doesn't exist, just pass FILE on unchanged. */ |
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| 45 | if (!path) |
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| 46 | return execv (file, argv); |
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| 47 | |
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| 48 | /* If FILE contains a directory, don't search $PATH. */ |
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| 49 | if (strchr (file, '/') |
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| 50 | ) |
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| 51 | return execv (file, argv); |
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| 52 | |
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| 53 | while (*path) |
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| 54 | { |
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| 55 | strccpy (buf, path, PATH_DELIM); |
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| 56 | /* An empty entry means the current directory. */ |
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| 57 | if (*buf != 0 && buf[strlen(buf) - 1] != '/') |
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| 58 | strcat (buf, "/"); |
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| 59 | strcat (buf, file); |
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| 60 | if (execv (buf, argv) == -1 && errno != ENOENT) |
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| 61 | return -1; |
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| 62 | while (*path && *path != PATH_DELIM) |
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| 63 | path++; |
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| 64 | if (*path == PATH_DELIM) |
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| 65 | path++; /* skip over delim */ |
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| 66 | } |
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| 67 | |
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| 68 | return -1; |
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| 69 | } |
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| 70 | |
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| 71 | #endif /* !_NO_EXECVE */ |
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