117 lines
2.1 KiB
C
117 lines
2.1 KiB
C
#include "defs.h"
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#include <fcntl.h>
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#ifdef O_LARGEFILE
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# if O_LARGEFILE == 0 /* biarch platforms in 64-bit mode */
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# undef O_LARGEFILE
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# ifdef SPARC64
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# define O_LARGEFILE 0x40000
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# elif defined X86_64 || defined S390X
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# define O_LARGEFILE 0100000
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# endif
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# endif
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#endif
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#include "xlat/open_access_modes.h"
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#include "xlat/open_mode_flags.h"
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#ifndef AT_FDCWD
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# define AT_FDCWD -100
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#endif
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/* The fd is an "int", so when decoding x86 on x86_64, we need to force sign
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* extension to get the right value. We do this by declaring fd as int here.
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*/
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void
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print_dirfd(struct tcb *tcp, int fd)
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{
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if (fd == AT_FDCWD)
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tprints("AT_FDCWD, ");
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else {
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printfd(tcp, fd);
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tprints(", ");
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}
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}
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/*
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* low bits of the open(2) flags define access mode,
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* other bits are real flags.
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*/
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const char *
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sprint_open_modes(int flags)
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{
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static char outstr[(1 + ARRAY_SIZE(open_mode_flags)) * sizeof("O_LARGEFILE")];
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char *p;
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char sep;
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const char *str;
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const struct xlat *x;
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sep = ' ';
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p = stpcpy(outstr, "flags");
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str = xlookup(open_access_modes, flags & 3);
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if (str) {
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*p++ = sep;
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p = stpcpy(p, str);
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flags &= ~3;
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if (!flags)
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return outstr;
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sep = '|';
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}
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for (x = open_mode_flags; x->str; x++) {
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if ((flags & x->val) == x->val) {
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*p++ = sep;
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p = stpcpy(p, x->str);
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flags &= ~x->val;
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if (!flags)
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return outstr;
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sep = '|';
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}
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}
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/* flags is still nonzero */
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*p++ = sep;
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sprintf(p, "%#x", flags);
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return outstr;
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}
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void
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tprint_open_modes(int flags)
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{
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tprints(sprint_open_modes(flags) + sizeof("flags"));
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}
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static int
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decode_open(struct tcb *tcp, int offset)
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{
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printpath(tcp, tcp->u_arg[offset]);
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tprints(", ");
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/* flags */
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tprint_open_modes(tcp->u_arg[offset + 1]);
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if (tcp->u_arg[offset + 1] & O_CREAT) {
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/* mode */
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tprintf(", %#lo", tcp->u_arg[offset + 2]);
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}
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return RVAL_DECODED | RVAL_FD;
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}
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SYS_FUNC(open)
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{
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return decode_open(tcp, 0);
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}
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SYS_FUNC(openat)
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{
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print_dirfd(tcp, tcp->u_arg[0]);
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return decode_open(tcp, 1);
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}
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SYS_FUNC(creat)
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{
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printpath(tcp, tcp->u_arg[0]);
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tprintf(", %#lo", tcp->u_arg[1]);
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return RVAL_DECODED | RVAL_FD;
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}
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