runtime.system.posix.auxvector source code

1 module runtime.system.posix.auxvector;
2 
3 version(Posix) @nogc nothrow:
4 
5 enum AT_NULL =   0;	/* end of vector */
6 enum AT_IGNORE = 1;	/* entry should be ignored */
7 enum AT_EXECFD = 2;	/* file descriptor of program */
8 enum AT_PHDR =   3;	/* program headers for program */
9 enum AT_PHENT =  4;	/* size of program header entry */
10 enum AT_PHNUM =  5;	/* number of program headers */
11 enum AT_PAGESZ = 6;	/* system page size */
12 enum AT_BASE =   7;	/* base address of interpreter */
13 enum AT_FLAGS =  8;	/* flags */
14 enum AT_ENTRY =  9;	/* entry point of program */
15 enum AT_NOTELF = 10;	/* program is not ELF */
16 enum AT_UID =    11;	/* real uid */
17 enum AT_EUID =   12;	/* effective uid */
18 enum AT_GID =    13;	/* real gid */
19 enum AT_EGID =   14;	/* effective gid */
20 enum AT_PLATFORM = 15;  /* string identifying CPU for optimizations */
21 enum AT_HWCAP =  16;    /* arch dependent hints at CPU capabilities */
22 enum AT_CLKTCK = 17;	/* frequency at which times() increments */
23 enum AT_SECURE = 23;   /* secure mode boolean */
24 enum AT_BASE_PLATFORM = 24;	/* string identifying real platform, may*/
25 enum AT_RANDOM = 25;	/* address of 16 random bytes */
26 enum AT_HWCAP2 = 26;	/* extension of AT_HWCAP */
27 enum AT_EXECFN = 31;	/* filename of program */
28 
29 __gshared uint g_posixPageSize;
30 
31 struct auxv_t
32 {
33     uint a_type;
34     union {
35         uint a_val;
36     }
37 }
38 
39 void _d_loadAuxVector(char** envp)
40 {
41     // mhmm, mhmm, yep, very sensible and logical mr linux.
42     while(*envp++ !is null){}
43 
44     auto auxp = cast(auxv_t*)envp; // This feels so, so wrong.
45     while(auxp.a_type != AT_NULL)
46     {
47         switch(auxp.a_type)
48         {
49             case AT_PAGESZ:
50                 g_posixPageSize = auxp.a_val;
51                 break;
52 
53             default: break;
54         }
55 
56         auxp += (auxv_t*).sizeof;
57     }
58 }