PostgreSQL Source Code  git master
pwritev.c
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1 /*-------------------------------------------------------------------------
2  *
3  * pwritev.c
4  * Implementation of pwritev(2) for platforms that lack one.
5  *
6  * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
7  *
8  * IDENTIFICATION
9  * src/port/pwritev.c
10  *
11  *-------------------------------------------------------------------------
12  */
13 
14 
15 #include "c.h"
16 
17 #include <unistd.h>
18 
19 #include "port/pg_iovec.h"
20 
21 ssize_t
22 pg_pwritev(int fd, const struct iovec *iov, int iovcnt, off_t offset)
23 {
24  ssize_t sum = 0;
25  ssize_t part;
26 
27  for (int i = 0; i < iovcnt; ++i)
28  {
29  part = pg_pwrite(fd, iov[i].iov_base, iov[i].iov_len, offset);
30  if (part < 0)
31  {
32  if (i == 0)
33  return -1;
34  else
35  return sum;
36  }
37  sum += part;
38  offset += part;
39  if (part < iov[i].iov_len)
40  return sum;
41  }
42  return sum;
43 }
int i
Definition: isn.c:73
#define pg_pwrite
Definition: port.h:226
static int fd(const char *x, int i)
Definition: preproc-init.c:105
ssize_t pg_pwritev(int fd, const struct iovec *iov, int iovcnt, off_t offset)
Definition: pwritev.c:22