From: Roland McGrath <roland@redhat.com>
This was supposed to be part of the recent mm_struct.saved_auxv[] patch.
The /proc addition is half the reason for the patch, and the more important
one (letting you debug live processes, while NT_AUXV in core dumps lets you
debug dead ones). The patch below was supposed to be part of the original.
25-akpm/fs/proc/base.c | 28 ++++++++++++++++++++++++++++
1 files changed, 28 insertions(+)
diff -puN fs/proc/base.c~proc-sys-auxv fs/proc/base.c
--- 25/fs/proc/base.c~proc-sys-auxv Thu Oct 2 17:21:13 2003
+++ 25-akpm/fs/proc/base.c Thu Oct 2 17:21:13 2003
@@ -53,6 +53,7 @@ enum pid_directory_inos {
PROC_TGID_EXE,
PROC_TGID_FD,
PROC_TGID_ENVIRON,
+ PROC_TGID_AUXV,
PROC_TGID_CMDLINE,
PROC_TGID_STAT,
PROC_TGID_STATM,
@@ -75,6 +76,7 @@ enum pid_directory_inos {
PROC_TID_EXE,
PROC_TID_FD,
PROC_TID_ENVIRON,
+ PROC_TID_AUXV,
PROC_TID_CMDLINE,
PROC_TID_STAT,
PROC_TID_STATM,
@@ -104,6 +106,7 @@ static struct pid_entry tgid_base_stuff[
E(PROC_TGID_TASK, "task", S_IFDIR|S_IRUGO|S_IXUGO),
E(PROC_TGID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR),
E(PROC_TGID_ENVIRON, "environ", S_IFREG|S_IRUSR),
+ E(PROC_TGID_AUXV, "auxv", S_IFREG|S_IRUSR),
E(PROC_TGID_STATUS, "status", S_IFREG|S_IRUGO),
E(PROC_TGID_CMDLINE, "cmdline", S_IFREG|S_IRUGO),
E(PROC_TGID_STAT, "stat", S_IFREG|S_IRUGO),
@@ -125,6 +128,7 @@ static struct pid_entry tgid_base_stuff[
static struct pid_entry tid_base_stuff[] = {
E(PROC_TID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR),
E(PROC_TID_ENVIRON, "environ", S_IFREG|S_IRUSR),
+ E(PROC_TID_AUXV, "auxv", S_IFREG|S_IRUSR),
E(PROC_TID_STATUS, "status", S_IFREG|S_IRUGO),
E(PROC_TID_CMDLINE, "cmdline", S_IFREG|S_IRUGO),
E(PROC_TID_STAT, "stat", S_IFREG|S_IRUGO),
@@ -322,6 +326,25 @@ out:
return res;
}
+static int proc_pid_auxv(struct task_struct *task, char *buffer)
+{
+ int res = 0;
+ struct mm_struct *mm = get_task_mm(task);
+ if (mm) {
+ unsigned int nwords = 0;
+ do
+ nwords += 2;
+ while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
+ res = nwords * sizeof(mm->saved_auxv[0]);
+ if (res > PAGE_SIZE)
+ res = PAGE_SIZE;
+ memcpy(buffer, mm->saved_auxv, res);
+ mmput(mm);
+ }
+ return res;
+}
+
+
#ifdef CONFIG_KALLSYMS
/*
* Provides a wchan file via kallsyms in a proper one-value-per-file format.
@@ -1271,6 +1294,11 @@ static struct dentry *proc_pident_lookup
inode->i_fop = &proc_info_file_operations;
ei->op.proc_read = proc_pid_environ;
break;
+ case PROC_TID_AUXV:
+ case PROC_TGID_AUXV:
+ inode->i_fop = &proc_info_file_operations;
+ ei->op.proc_read = proc_pid_auxv;
+ break;
case PROC_TID_STATUS:
case PROC_TGID_STATUS:
inode->i_fop = &proc_info_file_operations;
_