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support /proc/self/exe (needed for GDB to attach to an existing process)

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This commit is contained in:
Balazs Gerofi
2016-01-19 18:22:45 +09:00
parent 172bf0a389
commit fa7a5ccd11
3 changed files with 104 additions and 28 deletions
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34
executer/kernel/mcctrl/control.c
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@@ -49,6 +49,9 @@
//static DECLARE_WAIT_QUEUE_HEAD(wq_prepare);
//extern struct mcctrl_channel *channels;
int mcctrl_ikc_set_recv_cpu(ihk_os_t os, int cpu);
extern int procfs_create_entry(void *os, int ref, int osnum, int pid, char *name,
int mode, void *opaque);
extern void procfs_delete_entry(void *os, int osnum, char *fname);
static long mcexec_prepare_image(ihk_os_t os,
struct program_load_desc * __user udesc)
@@ -834,6 +837,12 @@ int mcexec_open_exec(ihk_os_t os, char * __user filename)
struct mckernel_exec_file *mcef;
struct mckernel_exec_file *mcef_iter;
int retval;
int os_ind = ihk_host_os_get_index(os);
char proc_name[1024];
if (os_ind < 0) {
return EINVAL;
}
file = open_exec(filename);
retval = PTR_ERR(file);
@@ -847,6 +856,8 @@ int mcexec_open_exec(ihk_os_t os, char * __user filename)
goto out_put_file;
}
snprintf(proc_name, 1024, "mcos%d/%d/exe", os_ind, current->tgid);
spin_lock_irq(&mckernel_exec_file_lock);
/* Find previous file (if exists) and drop it */
list_for_each_entry(mcef_iter, &mckernel_exec_files, list) {
@@ -855,6 +866,8 @@ int mcexec_open_exec(ihk_os_t os, char * __user filename)
fput(mcef_iter->fp);
list_del(&mcef_iter->list);
kfree(mcef_iter);
/* Drop old /proc/self/exe */
procfs_delete_entry(os, os_ind, proc_name);
dprintk("%d open_exec dropped previous executable \n", (int)current->tgid);
break;
}
@@ -865,6 +878,12 @@ int mcexec_open_exec(ihk_os_t os, char * __user filename)
mcef->pid = current->tgid;
mcef->fp = file;
list_add_tail(&mcef->list, &mckernel_exec_files);
/* Create /proc/self/exe entry */
if (procfs_create_entry(os, 0, os_ind, current->tgid, proc_name,
S_IFLNK, filename) != 0) {
printk("ERROR: could not create a procfs entry for %s.\n", proc_name);
}
spin_unlock(&mckernel_exec_file_lock);
dprintk("%d open_exec and holding file: %s\n", (int)current->tgid, filename);
@@ -882,6 +901,12 @@ int mcexec_close_exec(ihk_os_t os)
{
struct mckernel_exec_file *mcef = NULL;
int found = 0;
int os_ind = ihk_host_os_get_index(os);
char proc_name[1024];
if (os_ind < 0) {
return EINVAL;
}
spin_lock_irq(&mckernel_exec_file_lock);
list_for_each_entry(mcef, &mckernel_exec_files, list) {
@@ -895,6 +920,15 @@ int mcexec_close_exec(ihk_os_t os)
break;
}
}
/* Remove /proc/self/exe and /proc/self directory
* TODO: instead of removing directory explicitly, detect in procfs_delete_entry()
* when a directory becomes empty and remove it automatically */
snprintf(proc_name, 1024, "mcos%d/%d/exe", os_ind, current->tgid);
procfs_delete_entry(os, os_ind, proc_name);
snprintf(proc_name, 1024, "mcos%d/%d", os_ind, current->tgid);
procfs_delete_entry(os, os_ind, proc_name);
spin_unlock(&mckernel_exec_file_lock);
return (found ? 0 : EINVAL);