commit 562e53ea7d2ec904abba1cf9a9766fe3a91574e8
author Igor Sysoev <igor@sysoev.ru> Thu Nov 13 06:14:05 2003 +0000
committer Igor Sysoev <igor@sysoev.ru> Thu Nov 13 06:14:05 2003 +0000
tree 0ed6e4198fa7ac67ab299201dc40631c5fe145f4
parent 43beb6c40a44f94208e9ad1355758e58733bc1c2

nginx-0.0.1-2003-11-13-09:14:05 import

src/os/unix/ngx_files.c

diff --git a/src/os/unix/ngx_files.c b/src/os/unix/ngx_files.c
index f07ef54..1fd69fc 100644
--- a/src/os/unix/ngx_files.c
+++ b/src/os/unix/ngx_files.c
@@ -14,6 +14,8 @@
     ngx_log_debug(file->log, "read: %d, %x, %d, %qd" _
                   file->fd _ buf _ size _ offset);
 
+#if (HAVE_PREAD)
+
     n = pread(file->fd, buf, size, offset);
 
     if (n == -1) {
@@ -21,6 +23,24 @@
         return NGX_ERROR;
     }
 
+#else
+
+    if (file->offset != offset) {
+        if (lseek(file->fd, offset, SEEK_SET) == -1) {
+            ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "lseek() failed");
+            return NGX_ERROR;
+        }
+    }
+
+    n = read(file->fd, buf, size);
+
+    if (n == -1) {
+        ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "read() failed");
+        return NGX_ERROR;
+    }
+
+#endif
+
     file->offset += n;
 
     return n;
@@ -31,6 +51,8 @@
 {
     ssize_t n;
 
+#if (HAVE_PWRITE)
+
     n = pwrite(file->fd, buf, size, offset);
 
     if (n == -1) {
@@ -44,6 +66,30 @@
         return NGX_ERROR;
     }
 
+#else
+
+    if (file->offset != offset) {
+        if (lseek(file->fd, offset, SEEK_SET) == -1) {
+            ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "lseek() failed");
+            return NGX_ERROR;
+        }
+    }
+
+    n = write(file->fd, buf, size);
+
+    if (n == -1) {
+        ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "write() failed");
+        return NGX_ERROR;
+    }
+
+    if ((size_t) n != size) {
+        ngx_log_error(NGX_LOG_CRIT, file->log, 0,
+                      "write() has written only %d of %d", n, size);
+        return NGX_ERROR;
+    }
+
+#endif
+
     file->offset += n;
 
     return n;