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authorDmitry Chagin <dchagin@FreeBSD.org>2015-05-24 17:46:04 +0000
committerDmitry Chagin <dchagin@FreeBSD.org>2015-05-24 17:46:04 +0000
commita6fd8bb2bb7cfa591f67d2a4f51bd3ed922d79c8 (patch)
treedc510862fef10d0f01bdd2ae7ff6d1f6ad933413
parentffefd5707d894f4dc01d0d1fa8f3ed5d3c7ff124 (diff)
downloadsrc-a6fd8bb2bb7cfa591f67d2a4f51bd3ed922d79c8.tar.gz
src-a6fd8bb2bb7cfa591f67d2a4f51bd3ed922d79c8.zip
Add support for /proc/<pid>/auxv.
Notes
Notes: svn path=/head/; revision=283473
-rw-r--r--sys/compat/linprocfs/linprocfs.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/sys/compat/linprocfs/linprocfs.c b/sys/compat/linprocfs/linprocfs.c
index ee031d03bf02..a79569a3c1c8 100644
--- a/sys/compat/linprocfs/linprocfs.c
+++ b/sys/compat/linprocfs/linprocfs.c
@@ -1386,6 +1386,52 @@ linprocfs_douuid(PFS_FILL_ARGS)
return(0);
}
+/*
+ * Filler function for proc/pid/auxv
+ */
+static int
+linprocfs_doauxv(PFS_FILL_ARGS)
+{
+ struct sbuf *asb;
+ off_t buflen, resid;
+ int error;
+
+ /*
+ * Mimic linux behavior and pass only processes with usermode
+ * address space as valid. Return zero silently otherwise.
+ */
+ if (p->p_vmspace == &vmspace0)
+ return (0);
+
+ if (uio->uio_resid == 0)
+ return (0);
+ if (uio->uio_offset < 0 || uio->uio_resid < 0)
+ return (EINVAL);
+
+ asb = sbuf_new_auto();
+ if (asb == NULL)
+ return (ENOMEM);
+ error = proc_getauxv(td, p, asb);
+ if (error == 0)
+ error = sbuf_finish(asb);
+
+ resid = sbuf_len(asb) - uio->uio_offset;
+ if (resid > uio->uio_resid)
+ buflen = uio->uio_resid;
+ else
+ buflen = resid;
+ if (buflen > IOSIZE_MAX)
+ return (EINVAL);
+ if (buflen > MAXPHYS)
+ buflen = MAXPHYS;
+ if (resid <= 0)
+ return (0);
+
+ if (error == 0)
+ error = uiomove(sbuf_data(asb) + uio->uio_offset, buflen, uio);
+ sbuf_delete(asb);
+ return (error);
+}
/*
* Constructor
@@ -1461,6 +1507,8 @@ linprocfs_init(PFS_INIT_ARGS)
NULL, NULL, NULL, PFS_RD);
pfs_create_link(dir, "fd", &linprocfs_dofdescfs,
NULL, NULL, NULL, 0);
+ pfs_create_file(dir, "auxv", &linprocfs_doauxv,
+ NULL, &procfs_candebug, NULL, PFS_RD|PFS_RAWRD);
/* /proc/scsi/... */
dir = pfs_create_dir(root, "scsi", NULL, NULL, NULL, 0);