1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
#include <camellia/path.h>
#include <camellia/syscalls.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <user/lib/elfload.h>
int errno = 0;
int fork(void) {
return _syscall_fork(0, NULL);
}
int close(handle_t h) {
return _syscall_close(h);
}
_Noreturn void exit(int c) {
_syscall_exit(c);
}
_Noreturn void _exit(int c) { exit(c); };
int unlink(const char *path) {
size_t len = strlen(path) + 1;
char *abspath = malloc(len);
if (!abspath) return -1;
size_t abslen = absolutepath(abspath, path, len);
if (abslen == 0) { errno = EINVAL; goto err; }
handle_t h = _syscall_open(abspath, abslen - 1, 0);
if (h < 0) { errno = -h; goto err; }
long ret = _syscall_remove(h);
if (ret < 0) { errno = -ret; goto err; }
return 0;
err:
free(abspath);
return -1;
}
// TODO isatty
int isatty(int fd) {
return fd <= 2 ? 1 : 0;
}
int execv(const char *path, char *const argv[]) {
FILE *file = fopen(path, "r");
char hdr[4] = {0};
if (!file)
return -1;
fread(hdr, 1, 4, file);
fseek(file, 0, SEEK_SET);
if (!memcmp("\x7f""ELF", hdr, 4)) {
elf_execf(file, (void*)argv, NULL);
fclose(file);
} else if (!memcmp("#!", hdr, 2)) {
char buf[256];
fseek(file, 2, SEEK_SET);
if (fgets(buf, sizeof buf, file)) {
const char *argv [] = {buf, path, NULL};
char *endl = strchr(buf, '\n');
if (endl) *endl = '\0';
execv(buf, (void*)argv);
}
}
errno = EINVAL;
return -1;
}
static const char *__initialcwd;
static char *cwd = NULL, *cwd2 = NULL;
static size_t cwdcapacity = 0;
static const char *getrealcwd(void) {
/* __initialcwd can't just be initialized with "/" because ld has seemingly
* started to revolt against humanity and not process half the relocations
* it sees. */
if (cwd) return cwd;
if (__initialcwd) return __initialcwd;
return "/";
}
int chdir(const char *path) {
handle_t h;
char *tmp;
size_t len = absolutepath(NULL, path, 0) + 1; /* +1 for the trailing slash */
if (cwdcapacity < len) {
cwdcapacity = len;
if (cwd) {
cwd = realloc(cwd, len);
cwd2 = realloc(cwd2, len);
} else {
size_t initlen = strlen(__initialcwd) + 1;
if (len < initlen)
len = initlen;
cwd = malloc(initlen);
cwd2 = malloc(initlen);
memcpy(cwd, __initialcwd, initlen);
}
}
absolutepath(cwd2, path, cwdcapacity);
len = strlen(cwd2);
if (cwd2[len - 1] != '/') {
cwd2[len] = '/';
cwd2[len + 1] = '\0';
}
h = _syscall_open(cwd2, strlen(cwd2), 0);
if (h < 0) {
errno = ENOENT;
return -1;
}
_syscall_close(h);
tmp = cwd;
cwd = cwd2;
cwd2 = tmp;
return 0;
}
char *getcwd(char *buf, size_t capacity) {
const char *realcwd = getrealcwd();
size_t len = strlen(realcwd) + 1;
if (capacity < len) {
errno = capacity == 0 ? EINVAL : ERANGE;
return NULL;
}
memcpy(buf, realcwd, len);
return buf;
}
size_t absolutepath(char *out, const char *in, size_t size) {
const char *realcwd = getrealcwd();
size_t len, pos = 0;
_klogf("realcwd == %x\n", (long)__initialcwd);
if (!in) return strlen(realcwd) + 1;
if (!(in[0] == '/')) {
len = strlen(realcwd);
if (pos + len <= size && out != realcwd)
memcpy(out + pos, realcwd, len);
pos += len;
if (realcwd[len - 1] != '/') {
if (pos + 1 <= size) out[pos] = '/';
pos++;
}
}
len = strlen(in);
if (pos + len <= size)
memcpy(out + pos, in, len);
pos += len;
if (pos <= size) {
pos = path_simplify(out, out, pos);
if (pos > 0) out[pos] = '\0';
}
if (pos + 1 <= size) out[pos] = '\0';
pos++;
return pos;
}
void __setinitialcwd(const char *s) {
__initialcwd = s;
}
|
