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Check all lseek calls succeed.

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Also add missing TEMP_FAILURE_RETRYs on read, write, and lseek.

Bug: http://b/20625546
Change-Id: I03b198e11c1921b35518ee2dd005a7cfcf4fd94b
(cherry picked from commit 7bad7c4646)
This commit is contained in:
Elliott Hughes
2015-04-28 17:24:24 -07:00
parent f7466f9f23
commit 2f5feedf1d
14 changed files with 112 additions and 128 deletions
Download Patch File Download Diff File Expand all files Collapse all files
applypatch/applypatch.c
+27 -24
View File
@@ -422,20 +422,19 @@ int WriteToPartition(unsigned char* data, size_t len,
int attempt;
for (attempt = 0; attempt < 2; ++attempt) {
lseek(fd, start, SEEK_SET);
if (TEMP_FAILURE_RETRY(lseek(fd, start, SEEK_SET)) == -1) {
printf("failed seek on %s: %s\n",
partition, strerror(errno));
return -1;
}
while (start < len) {
size_t to_write = len - start;
if (to_write > 1<<20) to_write = 1<<20;
ssize_t written = write(fd, data+start, to_write);
if (written < 0) {
if (errno == EINTR) {
written = 0;
} else {
printf("failed write writing to %s (%s)\n",
partition, strerror(errno));
return -1;
}
ssize_t written = TEMP_FAILURE_RETRY(write(fd, data+start, to_write));
if (written == -1) {
printf("failed write writing to %s: %s\n", partition, strerror(errno));
return -1;
}
start += written;
}
@@ -460,13 +459,20 @@ int WriteToPartition(unsigned char* data, size_t len,
// won't just be reading the cache.
sync();
int dc = open("/proc/sys/vm/drop_caches", O_WRONLY);
write(dc, "3\n", 2);
if (TEMP_FAILURE_RETRY(write(dc, "3\n", 2)) == -1) {
printf("write to /proc/sys/vm/drop_caches failed: %s\n", strerror(errno));
} else {
printf(" caches dropped\n");
}
close(dc);
sleep(1);
printf(" caches dropped\n");
// verify
lseek(fd, 0, SEEK_SET);
if (TEMP_FAILURE_RETRY(lseek(fd, 0, SEEK_SET)) == -1) {
printf("failed to seek back to beginning of %s: %s\n",
partition, strerror(errno));
return -1;
}
unsigned char buffer[4096];
start = len;
size_t p;
@@ -476,15 +482,12 @@ int WriteToPartition(unsigned char* data, size_t len,
size_t so_far = 0;
while (so_far < to_read) {
ssize_t read_count = read(fd, buffer+so_far, to_read-so_far);
if (read_count < 0) {
if (errno == EINTR) {
read_count = 0;
} else {
printf("verify read error %s at %zu: %s\n",
partition, p, strerror(errno));
return -1;
}
ssize_t read_count =
TEMP_FAILURE_RETRY(read(fd, buffer+so_far, to_read-so_far));
if (read_count == -1) {
printf("verify read error %s at %zu: %s\n",
partition, p, strerror(errno));
return -1;
}
if ((size_t)read_count < to_read) {
printf("short verify read %s at %zu: %zd %zu %s\n",
@@ -625,8 +628,8 @@ ssize_t FileSink(const unsigned char* data, ssize_t len, void* token) {
ssize_t done = 0;
ssize_t wrote;
while (done < (ssize_t) len) {
wrote = write(fd, data+done, len-done);
if (wrote <= 0) {
wrote = TEMP_FAILURE_RETRY(write(fd, data+done, len-done));
if (wrote == -1) {
printf("error writing %d bytes: %s\n", (int)(len-done), strerror(errno));
return done;
}