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New API: pwrite-device

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This is the same as the existing 'pwrite' API call, but allows you
to write to a device.
This commit is contained in:
Richard W.M. Jones
2010-09-26 18:00:11 +01:00
parent 5a8c8b8bf6
commit eeaab2ba84
3 changed files with 54 additions and 11 deletions
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44
daemon/file.c
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@@ -463,11 +463,32 @@ do_pread (const char *path, int count, int64_t offset, size_t *size_r)
return buf;
}
static int
pwrite_fd (int fd, const char *content, size_t size, int64_t offset,
const char *display_path)
{
ssize_t r;
r = pwrite (fd, content, size, offset);
if (r == -1) {
reply_with_perror ("pwrite: %s", display_path);
close (fd);
return -1;
}
if (close (fd) == -1) {
reply_with_perror ("close: %s", display_path);
close (fd);
return -1;
}
return r;
}
int
do_pwrite (const char *path, const char *content, size_t size, int64_t offset)
{
int fd;
ssize_t r;
if (offset < 0) {
reply_with_error ("offset is negative");
@@ -483,20 +504,25 @@ do_pwrite (const char *path, const char *content, size_t size, int64_t offset)
return -1;
}
r = pwrite (fd, content, size, offset);
if (r == -1) {
reply_with_perror ("pwrite: %s", path);
close (fd);
return pwrite_fd (fd, content, size, offset, path);
}
int
do_pwrite_device (const char *device, const char *content, size_t size,
int64_t offset)
{
if (offset < 0) {
reply_with_error ("offset is negative");
return -1;
}
if (close (fd) == -1) {
reply_with_perror ("close: %s", path);
close (fd);
int fd = open (device, O_WRONLY);
if (fd == -1) {
reply_with_perror ("open: %s", device);
return -1;
}
return r;
return pwrite_fd (fd, content, size, offset, device);
}
/* This runs the 'file' command. */