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Close file descriptors after mmap

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Now is no longer needed to increase the limit of the maximum number of
file descriptors opened when loading large traces.
This commit is contained in:
Rodrigo Arias 2021-11-29 16:02:09 +01:00
parent 50081b0dc0
commit ca9bbf6401
2 changed files with 25 additions and 8 deletions
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6
emu.h
View File

@ -267,9 +267,6 @@ struct ovni_ethread {
/* The process associated with this thread */
struct ovni_eproc *proc;
/* Stream fd */
int stream_fd;
enum ethread_state state;
int is_running;
int is_active;
@ -296,6 +293,9 @@ struct ovni_ethread {
/* These pointers keep a linked list of threads in each CPU */
struct ovni_ethread *prev;
struct ovni_ethread *next;
/* Trace file path */
char tracefile[PATH_MAX];
};
/* State of each emulated process */

27
trace.c
View File

@ -85,13 +85,15 @@ load_thread(struct ovni_ethread *thread, struct ovni_eproc *proc, int index, int
thread->gindex = total_threads++;
thread->state = TH_ST_UNKNOWN;
thread->proc = proc;
thread->stream_fd = open(filepath, O_RDWR);
if(thread->stream_fd == -1)
if(strlen(filepath) >= PATH_MAX)
{
perror("open");
err("filepath too large: %s\n", filepath);
return -1;
}
strcpy(thread->tracefile, filepath);
return 0;
}
@ -388,8 +390,15 @@ static int
load_stream_buf(struct ovni_stream *stream, struct ovni_ethread *thread)
{
struct stat st;
int fd;
if(fstat(thread->stream_fd, &st) < 0)
if((fd = open(thread->tracefile, O_RDWR)) == -1)
{
perror("open");
return -1;
}
if(fstat(fd, &st) < 0)
{
perror("fstat");
return -1;
@ -402,12 +411,13 @@ load_stream_buf(struct ovni_stream *stream, struct ovni_ethread *thread)
stream->buf = NULL;
stream->active = 0;
/* No need to do anything else */
return 0;
}
stream->size = st.st_size;
stream->buf = mmap(NULL, stream->size, PROT_READ | PROT_WRITE,
MAP_SHARED, thread->stream_fd, 0);
MAP_SHARED, fd, 0);
if(stream->buf == MAP_FAILED)
{
@ -417,6 +427,13 @@ load_stream_buf(struct ovni_stream *stream, struct ovni_ethread *thread)
stream->active = 1;
/* No need to keep the fd open */
if(close(fd))
{
perror("close");
return -1;
}
return 0;
}