Last change
on this file since 445 was 444, checked in by coas-nagasima, 4 years ago |
muslのソースコードを追加
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Property svn:eol-style
set to
native
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Property svn:mime-type
set to
text/x-csrc;charset=UTF-8
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File size:
877 bytes
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Rev | Line | |
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[444] | 1 | #include <stdlib.h>
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| 2 | #include <limits.h>
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| 3 | #include <sys/stat.h>
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| 4 | #include <fcntl.h>
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| 5 | #include <errno.h>
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| 6 | #include <unistd.h>
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| 7 | #include <string.h>
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| 8 | #include "syscall.h"
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| 9 |
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| 10 | void __procfdname(char *, unsigned);
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| 11 |
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| 12 | char *realpath(const char *restrict filename, char *restrict resolved)
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| 13 | {
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| 14 | int fd;
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| 15 | ssize_t r;
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| 16 | struct stat st1, st2;
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| 17 | char buf[15+3*sizeof(int)];
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| 18 | char tmp[PATH_MAX];
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| 19 |
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| 20 | if (!filename) {
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| 21 | errno = EINVAL;
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| 22 | return 0;
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| 23 | }
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| 24 |
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| 25 | fd = sys_open(filename, O_PATH|O_NONBLOCK|O_CLOEXEC);
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| 26 | if (fd < 0) return 0;
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| 27 | __procfdname(buf, fd);
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| 28 |
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| 29 | r = readlink(buf, tmp, sizeof tmp - 1);
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| 30 | if (r < 0) goto err;
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| 31 | tmp[r] = 0;
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| 32 |
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| 33 | fstat(fd, &st1);
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| 34 | r = stat(tmp, &st2);
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| 35 | if (r<0 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino) {
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| 36 | if (!r) errno = ELOOP;
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| 37 | goto err;
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| 38 | }
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| 39 |
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| 40 | __syscall(SYS_close, fd);
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| 41 | return resolved ? strcpy(resolved, tmp) : strdup(tmp);
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| 42 | err:
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| 43 | __syscall(SYS_close, fd);
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| 44 | return 0;
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| 45 | }
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