ceph/src/pmdk/src/windows/include/unistd.h

   1 /* SPDX-License-Identifier: BSD-3-Clause */
   2 /* Copyright 2015-2020, Intel Corporation */
   3
   4 /*
   5  * unistd.h -- compatibility layer for POSIX operating system API
   6  */
   7
   8 #ifndef UNISTD_H
   9 #define UNISTD_H 1
  10
  11 #include <stdio.h>
  12
  13 #define _SC_PAGESIZE 0
  14 #define _SC_NPROCESSORS_ONLN 1
  15
  16 #define R_OK 04
  17 #define W_OK 02
  18 #define X_OK 00 /* execute permission doesn't exist on Windows */
  19 #define F_OK 00
  20
  21 /*
  22  * sysconf -- get configuration information at run time
  23  */
  24 static __inline long
  25 sysconf(int p)
  26 {
  27         SYSTEM_INFO si;
  28         int ret = 0;
  29
  30         switch (p) {
  31         case _SC_PAGESIZE:
  32                 GetSystemInfo(&si);
  33                 return si.dwPageSize;
  34
  35         case _SC_NPROCESSORS_ONLN:
  36                 for (int i = 0; i < GetActiveProcessorGroupCount(); i++) {
  37                         ret += GetActiveProcessorCount(i);
  38                 }
  39                 return ret;
  40
  41         default:
  42                 return 0;
  43         }
  44
  45 }
  46
  47 #define getpid _getpid
  48
  49 /*
  50  * pread -- read from a file descriptor at given offset
  51  */
  52 static ssize_t
  53 pread(int fd, void *buf, size_t count, os_off_t offset)
  54 {
  55         __int64 position = _lseeki64(fd, 0, SEEK_CUR);
  56         _lseeki64(fd, offset, SEEK_SET);
  57         int ret = _read(fd, buf, (unsigned)count);
  58         _lseeki64(fd, position, SEEK_SET);
  59         return ret;
  60 }
  61
  62 /*
  63  * pwrite -- write to a file descriptor at given offset
  64  */
  65 static ssize_t
  66 pwrite(int fd, const void *buf, size_t count, os_off_t offset)
  67 {
  68         __int64 position = _lseeki64(fd, 0, SEEK_CUR);
  69         _lseeki64(fd, offset, SEEK_SET);
  70         int ret = _write(fd, buf, (unsigned)count);
  71         _lseeki64(fd, position, SEEK_SET);
  72         return ret;
  73 }
  74
  75 #define S_ISBLK(x) 0 /* BLK devices not exist on Windows */
  76
  77 /*
  78  * basename -- parse pathname and return filename component
  79  */
  80 static char *
  81 basename(char *path)
  82 {
  83         char fname[_MAX_FNAME];
  84         char ext[_MAX_EXT];
  85         _splitpath(path, NULL, NULL, fname, ext);
  86
  87         sprintf(path, "%s%s", fname, ext);
  88
  89         return path;
  90 }
  91
  92 /*
  93  * dirname -- parse pathname and return directory component
  94  */
  95 static char *
  96 dirname(char *path)
  97 {
  98         if (path == NULL)
  99                 return ".";
 100
 101         size_t len = strlen(path);
 102         if (len == 0)
 103                 return ".";
 104
 105         char *end = path + len;
 106
 107         /* strip trailing forslashes and backslashes */
 108         while ((--end) > path) {
 109                 if (*end != '\\' && *end != '/') {
 110                         *(end + 1) = '\0';
 111                         break;
 112                 }
 113         }
 114
 115         /* strip basename */
 116         while ((--end) > path) {
 117                 if (*end == '\\' || *end == '/') {
 118                         *end = '\0';
 119                         break;
 120                 }
 121         }
 122
 123         if (end != path) {
 124                 return path;
 125                 /* handle edge cases */
 126         } else if (*end == '\\' || *end == '/') {
 127                 *(end + 1) = '\0';
 128         } else {
 129                 *end++ = '.';
 130                 *end = '\0';
 131         }
 132
 133         return path;
 134 }
 135
 136 #endif /* UNISTD_H */