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read/write loops in case payload > 65536 (pipe buffer size)

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Omar Rizwan 2020-11-22 20:52:26 -08:00
parent 03219b64d7
commit a7e38dc258
1 changed files with 15 additions and 7 deletions
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22
fs/tabfs.c
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@ -12,16 +12,26 @@
#include "base64/base64.h"
#include "base64/base64.c"
FILE* l;
static cJSON *send_request_then_await_response(cJSON *req) {
char *request_data = cJSON_Print(req);
unsigned int request_len = strlen(request_data);
write(1, (char *) &request_len, 4); // stdout
write(1, request_data, request_len);
unsigned int bytes_written = 0;
while (bytes_written < request_len) {
bytes_written += write(1, request_data, request_len);
}
/* fprintf(l, "req[%s]\n", request_data); fflush(l); */
unsigned int response_len;
read(0, (char *) &response_len, 4); // stdin
char *response_data = malloc(response_len);
read(0, response_data, response_len);
unsigned int bytes_read = 0;
while (bytes_read < response_len) {
bytes_read += read(0, response_data + bytes_read, response_len);
}
/* fprintf(l, "resp(%d; expected %d)[%s]\n", bytes_read, response_len, response_data); fflush(l); */
if (response_data == NULL) {
// Connection is dead.
return cJSON_Parse("{ \"error\": 5 }");
@ -227,9 +237,7 @@ static struct fuse_operations tabfs_filesystem_operations = {
.releasedir = tabfs_releasedir
};
int
main(int argc, char **argv)
{
int main(int argc, char **argv) {
/* system("killall -9 tabfs"); */
char killcmd[1000];
sprintf(killcmd, "pgrep tabfs | grep -v %d | xargs kill -9", getpid());
@ -240,9 +248,9 @@ main(int argc, char **argv)
system("fusermount -u mnt");
#endif
FILE* log = fopen("log.txt", "w");
l = fopen("log.txt", "w");
for (int i = 0; i < argc; i++) {
fprintf(log, "arg%d: [%s]\n", i, argv[i]); fflush(log);
fprintf(l, "arg%d: [%s]\n", i, argv[i]); fflush(l);
}
char* fuse_argv[] = {argv[0], "-odirect_io", "-s", "-f", "mnt"};
return fuse_main(5, fuse_argv, &tabfs_filesystem_operations, NULL);