Mercurial > hg > toybox
annotate toys/posix/uname.c @ 1531:3ff823086c99 draft
Teach ln -f to leave original target alone if link creation fails.
Suggested by Ashwini Sharma, I wound up implementing it by creating the new
link at a temporary name and renaming it over the old one instead of renaming
the old file out of the way and putting it back if it failed.
(Because "mkdir -p one/one/blah && ln -sf /bin/one one" would otherwise
rename one/one out of the way and only notice it can't delete it way at the
end when recovery's darn awkward, vs create new thing and if rename fails
(including EISDIR) that's the main error path. And yes the temporary name
is in the same directory as the destination so we never rename between mounts.)
link over the old one instead of renaming the old file and renaming it back.
author | Rob Landley <rob@landley.net> |
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date | Wed, 22 Oct 2014 17:11:06 -0500 |
parents | 7a45b9b54d3d |
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1 /* uname.c - return system name |
326 | 2 * |
3 * Copyright 2008 Rob Landley <rob@landley.net> | |
4 * | |
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Regularize command headers, update links to standards documents.
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5 * See http://opengroup.org/onlinepubs/9699919799/utilities/uname.html |
326 | 6 |
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7 USE_UNAME(NEWTOY(uname, "oamvrns[+os]", TOYFLAG_BIN)) |
326 | 8 |
9 config UNAME | |
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10 bool "uname" |
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11 default y |
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12 help |
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uname: Fix help string
Elie De Brauwer <eliedebrauwer@gmail.com>
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13 usage: uname [-asnrvm] |
326 | 14 |
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15 Print system information. |
326 | 16 |
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17 -s System name |
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18 -n Network (domain) name |
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19 -r Kernel Release number |
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20 -v Kernel Version |
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21 -m Machine (hardware) name |
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22 -a All of the above |
326 | 23 */ |
24 | |
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New build infrastructure to generate FLAG_ macros and TT alias, #define FOR_commandname before #including toys.h to trigger it. Rename DEFINE_GLOBALS() to just GLOBALS() (because I could never remember if it was DECLARE_GLOBALS). Convert existing commands to use new infrastructure, and replace optflag constants with FLAG_ macros where appropriate.
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25 #define FOR_uname |
326 | 26 #include "toys.h" |
27 | |
28 // If a 32 bit x86 build environment working in a chroot under an x86-64 | |
29 // kernel returns x86_64 for -m it confuses ./configure. Special case it. | |
30 | |
31 #if defined(__i686__) | |
32 #define GROSS "i686" | |
33 #elif defined(__i586__) | |
34 #define GROSS "i586" | |
35 #elif defined(__i486__) | |
36 #define GROSS "i486" | |
37 #elif defined(__i386__) | |
38 #define GROSS "i386" | |
39 #endif | |
40 | |
41 void uname_main(void) | |
42 { | |
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43 int i, flags = toys.optflags, needspace=0; |
326 | 44 |
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45 uname((void *)toybuf); |
326 | 46 |
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47 if (!flags) flags = FLAG_s; |
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48 for (i=0; i<5; i++) { |
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49 char *c = toybuf+(65*i); |
326 | 50 |
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51 if (flags & ((1<<i)|FLAG_a)) { |
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52 int len = strlen(c); |
326 | 53 |
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54 // This problem originates in autoconf, so of course the solution |
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55 // is horribly ugly. |
326 | 56 #ifdef GROSS |
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57 if (i==4 && !strcmp(c,"x86_64")) { |
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58 printf(GROSS); |
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59 continue; |
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60 } |
326 | 61 #endif |
62 | |
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63 if (needspace++) { |
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64 // We can't decrement on the first entry, because |
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65 // needspace would be 0 |
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66 *(--c)=' '; |
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67 len++; |
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68 } |
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69 xwrite(1, c, len); |
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70 } |
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71 } |
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72 putchar('\n'); |
326 | 73 } |