1 /* 2 * Copyright 2002-2013, Axel Dörfler, axeld@pinc-software.de. 3 * Distributed under the terms of the MIT License. 4 */ 5 6 7 #include <errno.h> 8 #include <unistd.h> 9 10 #include <errno_private.h> 11 #include <syscalls.h> 12 #include <syscall_utils.h> 13 14 15 ssize_t 16 readlink(const char *path, char *buffer, size_t bufferSize) 17 { 18 return readlinkat(AT_FDCWD, path, buffer, bufferSize); 19 } 20 21 22 ssize_t 23 readlinkat(int fd, const char *path, char *buffer, size_t bufferSize) 24 { 25 size_t linkLen = bufferSize; 26 status_t status = _kern_read_link(fd, path, buffer, &linkLen); 27 if (status < B_OK) { 28 __set_errno(status); 29 return -1; 30 } 31 32 // If the buffer is big enough, null-terminate the string. That's not 33 // required by the standard, but helps non-conforming apps. 34 if (linkLen < bufferSize) 35 buffer[linkLen] = '\0'; 36 37 // _kern_read_link() returns the length of the link, but readlinkat() is 38 // supposed to return the number of bytes placed into buffer. If the 39 // buffer is larger than the link contents, then linkLen is the number 40 // of bytes written to the buffer. Otherwise, bufferSize bytes will have 41 // been written. 42 return min_c(linkLen, bufferSize); 43 } 44 45 46 int 47 symlink(const char *toPath, const char *symlinkPath) 48 { 49 int status = _kern_create_symlink(-1, symlinkPath, toPath, 0); 50 51 RETURN_AND_SET_ERRNO(status); 52 } 53 54 55 int 56 symlinkat(const char *toPath, int fd, const char *symlinkPath) 57 { 58 RETURN_AND_SET_ERRNO(_kern_create_symlink(fd, symlinkPath, toPath, 0)); 59 } 60 61 62 int 63 unlink(const char *path) 64 { 65 int status = _kern_unlink(-1, path); 66 67 RETURN_AND_SET_ERRNO(status); 68 } 69 70 71 int 72 unlinkat(int fd, const char *path, int flag) 73 { 74 if ((flag & AT_REMOVEDIR) != 0) 75 RETURN_AND_SET_ERRNO(_kern_remove_dir(fd, path)); 76 else 77 RETURN_AND_SET_ERRNO(_kern_unlink(fd, path)); 78 } 79 80 81 int 82 link(const char *toPath, const char *linkPath) 83 { 84 int status = _kern_create_link(-1, linkPath, -1, toPath, true); 85 // Haiku -> POSIX error mapping 86 if (status == B_UNSUPPORTED) 87 status = EPERM; 88 89 RETURN_AND_SET_ERRNO(status); 90 } 91 92 93 int 94 linkat(int toFD, const char *toPath, int linkFD, const char *linkPath, int flag) 95 { 96 RETURN_AND_SET_ERRNO(_kern_create_link(linkFD, linkPath, toFD, toPath, 97 (flag & AT_SYMLINK_FOLLOW) != 0)); 98 } 99 100