support/sys-uio.c

   1 /*
   2  * <sys/uio.h> wrapper functions.
   3  *
   4  * Authors:
   5  *   Steffen Kiess (s-kiess@web.de)
   6  *
   7  * Copyright (C) 2012 Steffen Kiess
   8  */
   9
  10 #ifndef _GNU_SOURCE
  11 #define _GNU_SOURCE
  12 #endif /* ndef _GNU_SOURCE */
  13
  14 #include "sys-uio.h"
  15
  16 #include <sys/uio.h>
  17
  18 #include "map.h"
  19 #include "mph.h"
  20
  21 G_BEGIN_DECLS
  22
  23 struct iovec*
  24 _mph_from_iovec_array (struct Mono_Posix_Iovec *iov, gint32 iovcnt)
  25 {
  26         struct iovec* v;
  27         gint32 i;
  28
  29         if (iovcnt < 0) {
  30                 errno = EINVAL;
  31                 return NULL;
  32         }
  33
  34         v = malloc (iovcnt * sizeof (struct iovec));
  35         if (!v) {
  36                 return NULL;
  37         }
  38
  39         for (i = 0; i < iovcnt; i++) {
  40                 if (Mono_Posix_FromIovec (&iov[i], &v[i]) != 0) {
  41                         free (v);
  42                         return NULL;
  43                 }
  44         }
  45
  46         return v;
  47 }
  48
  49 #ifdef HAVE_READV
  50 gint64
  51 Mono_Posix_Syscall_readv (int dirfd, struct Mono_Posix_Iovec *iov, gint32 iovcnt)
  52 {
  53         struct iovec* v;
  54         gint64 res;
  55
  56         v = _mph_from_iovec_array (iov, iovcnt);
  57         if (!v) {
  58                 return -1;
  59         }
  60
  61         res = readv(dirfd, v, iovcnt);
  62         free (v);
  63         return res;
  64 }
  65 #endif /* def HAVE_READV */
  66
  67 #ifdef HAVE_WRITEV
  68 gint64
  69 Mono_Posix_Syscall_writev (int dirfd, struct Mono_Posix_Iovec *iov, gint32 iovcnt)
  70 {
  71         struct iovec* v;
  72         gint64 res;
  73
  74         v = _mph_from_iovec_array (iov, iovcnt);
  75         if (!v) {
  76                 return -1;
  77         }
  78
  79         res = writev (dirfd, v, iovcnt);
  80         free (v);
  81         return res;
  82 }
  83 #endif /* def HAVE_WRITEV */
  84
  85 #ifdef HAVE_PREADV
  86 gint64
  87 Mono_Posix_Syscall_preadv (int dirfd, struct Mono_Posix_Iovec *iov, gint32 iovcnt, gint64 off)
  88 {
  89         struct iovec* v;
  90         gint64 res;
  91
  92         mph_return_if_off_t_overflow (off);
  93
  94         v = _mph_from_iovec_array (iov, iovcnt);
  95         if (!v) {
  96                 return -1;
  97         }
  98
  99         res = preadv (dirfd, v, iovcnt, (off_t) off);
 100         free (v);
 101         return res;
 102 }
 103 #endif /* def HAVE_PREADV */
 104
 105 #ifdef HAVE_PWRITEV
 106 gint64
 107 Mono_Posix_Syscall_pwritev (int dirfd, struct Mono_Posix_Iovec *iov, gint32 iovcnt, gint64 off)
 108 {
 109         struct iovec* v;
 110         gint64 res;
 111
 112         mph_return_if_off_t_overflow (off);
 113
 114         v = _mph_from_iovec_array (iov, iovcnt);
 115         if (!v) {
 116                 return -1;
 117         }
 118
 119         res = pwritev (dirfd, v, iovcnt, (off_t) off);
 120         free (v);
 121         return res;
 122 }
 123 #endif /* def HAVE_PWRITEV */
 124
 125
 126 /*
 127  * vim: noexpandtab
 128  */