diff options
Diffstat (limited to 'usr/src/lib/libproc/common/pr_lseek.c')
| -rw-r--r-- | usr/src/lib/libproc/common/pr_lseek.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/usr/src/lib/libproc/common/pr_lseek.c b/usr/src/lib/libproc/common/pr_lseek.c new file mode 100644 index 0000000000..1d46f2db01 --- /dev/null +++ b/usr/src/lib/libproc/common/pr_lseek.c @@ -0,0 +1,187 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License, Version 1.0 only + * (the "License"). You may not use this file except in compliance + * with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* + * Copyright (c) 1998-2000 by Sun Microsystems, Inc. + * All rights reserved. + */ + +#pragma ident "%Z%%M% %I% %E% SMI" + +#include <stdlib.h> +#include <unistd.h> +#include <errno.h> +#include "libproc.h" + +typedef union { + offset_t full; /* full 64 bit offset value */ + uint32_t half[2]; /* two 32-bit halves */ +} offsets_t; + +/* + * lseek() system call -- executed by subject process. + */ +off_t +pr_lseek(struct ps_prochandle *Pr, int filedes, off_t offset, int whence) +{ + int syscall; /* SYS_lseek or SYS_llseek */ + int nargs; /* 3 or 4, depending on syscall */ + offsets_t off; + sysret_t rval; /* return value from lseek() */ + argdes_t argd[4]; /* arg descriptors for lseek() */ + argdes_t *adp; + int error; + + if (Pr == NULL) + return (lseek(filedes, offset, whence)); + + adp = &argd[0]; /* filedes argument */ + adp->arg_value = filedes; + adp->arg_object = NULL; + adp->arg_type = AT_BYVAL; + adp->arg_inout = AI_INPUT; + adp->arg_size = 0; + + adp++; /* offset argument */ + if (Pstatus(Pr)->pr_dmodel == PR_MODEL_NATIVE) { + syscall = SYS_lseek; + nargs = 3; + adp->arg_value = offset; + adp->arg_object = NULL; + adp->arg_type = AT_BYVAL; + adp->arg_inout = AI_INPUT; + adp->arg_size = 0; + } else { + syscall = SYS_llseek; + nargs = 4; + off.full = offset; + adp->arg_value = off.half[0]; /* first 32 bits */ + adp->arg_object = NULL; + adp->arg_type = AT_BYVAL; + adp->arg_inout = AI_INPUT; + adp->arg_size = 0; + adp++; + adp->arg_value = off.half[1]; /* second 32 bits */ + adp->arg_object = NULL; + adp->arg_type = AT_BYVAL; + adp->arg_inout = AI_INPUT; + adp->arg_size = 0; + } + + adp++; /* whence argument */ + adp->arg_value = whence; + adp->arg_object = NULL; + adp->arg_type = AT_BYVAL; + adp->arg_inout = AI_INPUT; + adp->arg_size = 0; + + error = Psyscall(Pr, &rval, syscall, nargs, &argd[0]); + + if (error) { + errno = (error > 0)? error : ENOSYS; + return ((off_t)(-1)); + } + + if (Pstatus(Pr)->pr_dmodel == PR_MODEL_NATIVE) + offset = rval.sys_rval1; + else { + off.half[0] = (uint32_t)rval.sys_rval1; + off.half[1] = (uint32_t)rval.sys_rval2; + offset = (off_t)off.full; + } + + return (offset); +} + +/* + * llseek() system call -- executed by subject process. + */ +offset_t +pr_llseek(struct ps_prochandle *Pr, int filedes, offset_t offset, int whence) +{ + int syscall; /* SYS_lseek or SYS_llseek */ + int nargs; /* 3 or 4, depending on syscall */ + offsets_t off; + sysret_t rval; /* return value from llseek() */ + argdes_t argd[4]; /* arg descriptors for llseek() */ + argdes_t *adp; + int error; + + if (Pr == NULL) + return (llseek(filedes, offset, whence)); + + adp = &argd[0]; /* filedes argument */ + adp->arg_value = filedes; + adp->arg_object = NULL; + adp->arg_type = AT_BYVAL; + adp->arg_inout = AI_INPUT; + adp->arg_size = 0; + + adp++; /* offset argument */ + if (Pstatus(Pr)->pr_dmodel == PR_MODEL_LP64) { + syscall = SYS_lseek; + nargs = 3; + adp->arg_value = offset; + adp->arg_object = NULL; + adp->arg_type = AT_BYVAL; + adp->arg_inout = AI_INPUT; + adp->arg_size = 0; + } else { + syscall = SYS_llseek; + nargs = 4; + off.full = offset; + adp->arg_value = off.half[0]; /* first 32 bits */ + adp->arg_object = NULL; + adp->arg_type = AT_BYVAL; + adp->arg_inout = AI_INPUT; + adp->arg_size = 0; + adp++; + adp->arg_value = off.half[1]; /* second 32 bits */ + adp->arg_object = NULL; + adp->arg_type = AT_BYVAL; + adp->arg_inout = AI_INPUT; + adp->arg_size = 0; + } + + adp++; /* whence argument */ + adp->arg_value = whence; + adp->arg_object = NULL; + adp->arg_type = AT_BYVAL; + adp->arg_inout = AI_INPUT; + adp->arg_size = 0; + + error = Psyscall(Pr, &rval, syscall, nargs, &argd[0]); + + if (error) { + errno = (error > 0)? error : ENOSYS; + return ((offset_t)(-1)); + } + + if (Pstatus(Pr)->pr_dmodel == PR_MODEL_LP64) + offset = rval.sys_rval1; + else { + off.half[0] = (uint32_t)rval.sys_rval1; + off.half[1] = (uint32_t)rval.sys_rval2; + offset = off.full; + } + + return (offset); +} |