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Add support for /proc/<pid>/auxv.

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This commit is contained in:
dchagin 2015-05-24 17:46:04 +00:00
parent ee57f9ca57
commit 04d6782581
1 changed files with 48 additions and 0 deletions
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48
sys/compat/linprocfs/linprocfs.c
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@ -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);