1 /* SPDX-License-Identifier: LGPL-2.1 OR MIT */ 2 /* 3 * unistd function definitions for NOLIBC 4 * Copyright (C) 2017-2022 Willy Tarreau <w@1wt.eu> 5 */ 6 7 /* make sure to include all global symbols */ 8 #include "nolibc.h" 9 10 #ifndef _NOLIBC_UNISTD_H 11 #define _NOLIBC_UNISTD_H 12 13 #include "std.h" 14 #include "arch.h" 15 #include "types.h" 16 #include "sys.h" 17 18 19 #define STDIN_FILENO 0 20 #define STDOUT_FILENO 1 21 #define STDERR_FILENO 2 22 23 #define F_OK 0 24 #define X_OK 1 25 #define W_OK 2 26 #define R_OK 4 27 28 /* 29 * int access(const char *path, int amode); 30 * int faccessat(int fd, const char *path, int amode, int flag); 31 */ 32 33 static __attribute__((unused)) 34 int _sys_faccessat(int fd, const char *path, int amode, int flag) 35 { 36 return __nolibc_syscall4(__NR_faccessat, fd, path, amode, flag); 37 } 38 39 static __attribute__((unused)) 40 int faccessat(int fd, const char *path, int amode, int flag) 41 { 42 return __sysret(_sys_faccessat(fd, path, amode, flag)); 43 } 44 45 static __attribute__((unused)) 46 int access(const char *path, int amode) 47 { 48 return faccessat(AT_FDCWD, path, amode, 0); 49 } 50 51 #if !defined(_sys_ftruncate64) && defined(__NR_ftruncate64) 52 static __attribute__((unused)) 53 int _sys_ftruncate64(int fd, uint32_t length0, uint32_t length1) 54 { 55 return __nolibc_syscall3(__NR_ftruncate64, fd, length0, length1); 56 } 57 #define _sys_ftruncate64 _sys_ftruncate64 58 #endif 59 60 static __attribute__((unused)) 61 int _sys_ftruncate(int fd, off_t length) 62 { 63 #if defined(_sys_ftruncate64) 64 return _sys_ftruncate64(fd, __NOLIBC_LLARGPART(length, 0), __NOLIBC_LLARGPART(length, 1)); 65 #else 66 return __nolibc_syscall2(__NR_ftruncate, fd, length); 67 #endif 68 } 69 70 static __attribute__((unused)) 71 int ftruncate(int fd, off_t length) 72 { 73 return __sysret(_sys_ftruncate(fd, length)); 74 } 75 76 /* 77 * char *getcwd(char *buf, size_t size); 78 */ 79 80 static __attribute__((unused)) 81 int _sys_getcwd(char *buf, size_t size) 82 { 83 return __nolibc_syscall2(__NR_getcwd, buf, size); 84 } 85 86 static __attribute__((unused)) 87 char *getcwd(char *buf, size_t size) 88 { 89 int ret; 90 91 /* Unlike other libc's we don't handle passing NULL for buf */ 92 if (!buf || !size) { 93 SET_ERRNO(EINVAL); 94 return NULL; 95 } 96 97 ret = __sysret(_sys_getcwd(buf, size)); 98 99 /* On error return NULL, __sysret() above will have set errno */ 100 if (ret < 0) 101 return NULL; 102 103 /* Handle no path being written or the kernel putting 104 * "(unreachable)" into the buffer instead of a path. 105 * This matches what musl is doing. 106 */ 107 if (ret == 0 || buf[0] != '/') { 108 SET_ERRNO(ENOENT); 109 return NULL; 110 } 111 112 /* ret must be the number of bytes written at this point, 113 * so return the pointer to buf. 114 */ 115 return buf; 116 } 117 118 static __attribute__((unused)) 119 int msleep(unsigned int msecs) 120 { 121 struct timeval my_timeval = { msecs / 1000, (msecs % 1000) * 1000 }; 122 123 if (_sys_select(0, NULL, NULL, NULL, &my_timeval) < 0) 124 return (my_timeval.tv_sec * 1000) + 125 (my_timeval.tv_usec / 1000) + 126 !!(my_timeval.tv_usec % 1000); 127 else 128 return 0; 129 } 130 131 /* 132 * ssize_t readlink(const char *path, char *buf, size_t bufsiz); 133 */ 134 135 static __attribute__((unused)) 136 ssize_t _sys_readlink(const char *path, char *buf, size_t bufsiz) 137 { 138 return __nolibc_syscall4(__NR_readlinkat, AT_FDCWD, path, buf, bufsiz); 139 } 140 141 static __attribute__((unused)) 142 ssize_t readlink(const char *path, char *buf, size_t bufsiz) 143 { 144 return __sysret(_sys_readlink(path, buf, bufsiz)); 145 } 146 147 static __attribute__((unused)) 148 unsigned int sleep(unsigned int seconds) 149 { 150 struct timeval my_timeval = { seconds, 0 }; 151 152 if (_sys_select(0, NULL, NULL, NULL, &my_timeval) < 0) 153 return my_timeval.tv_sec + !!my_timeval.tv_usec; 154 else 155 return 0; 156 } 157 158 static __attribute__((unused)) 159 int usleep(unsigned int usecs) 160 { 161 struct timeval my_timeval = { usecs / 1000000, usecs % 1000000 }; 162 163 return _sys_select(0, NULL, NULL, NULL, &my_timeval); 164 } 165 166 static __attribute__((unused)) 167 int tcsetpgrp(int fd, pid_t pid) 168 { 169 return ioctl(fd, TIOCSPGRP, &pid); 170 } 171 172 #endif /* _NOLIBC_UNISTD_H */ 173