Author: dchagin
Date: Sun May 24 17:46:04 2015
New Revision: 283473
URL: https://svnweb.freebsd.org/changeset/base/283473
Log:
Add support for /proc/<pid>/auxv.
Modified:
head/sys/compat/linprocfs/linprocfs.c
Modified: head/sys/compat/linprocfs/linprocfs.c
==============================================================================
--- head/sys/compat/linprocfs/linprocfs.c Sun May 24 17:44:42 2015
(r283472)
+++ head/sys/compat/linprocfs/linprocfs.c Sun May 24 17:46:04 2015
(r283473)
@@ -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);
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