Date: Sun, 24 May 2015 17:46:05 +0000 (UTC) From: Dmitry Chagin <dchagin@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r283473 - head/sys/compat/linprocfs Message-ID: <201505241746.t4OHk56v030318@svn.freebsd.org>
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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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