fcntl.c

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/*
 * trace/beauty/fcntl.c
 *
 *  Copyright (C) 2017, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
 *
 * Released under the GPL v2. (and only v2, not any later version)
 */

#include "trace/beauty/beauty.h"
#include <linux/kernel.h>
#include <uapi/linux/fcntl.h>

static size_t fcntl__scnprintf_getfd(unsigned long val, char *bf, size_t size)
{
    return scnprintf(bf, size, "%s", val ? "CLOEXEC" : "0");
}

static size_t syscall_arg__scnprintf_fcntl_getfd(char *bf, size_t size, struct syscall_arg *arg)
{
    return fcntl__scnprintf_getfd(arg->val, bf, size);
}

static size_t fcntl__scnprintf_getlease(unsigned long val, char *bf, size_t size)
{
    static const char *fcntl_setlease[] = { "RDLCK", "WRLCK", "UNLCK", };
    static DEFINE_STRARRAY(fcntl_setlease);

    return strarray__scnprintf(&strarray__fcntl_setlease, bf, size, "%x", val);
}

static size_t syscall_arg__scnprintf_fcntl_getlease(char *bf, size_t size, struct syscall_arg *arg)
{
    return fcntl__scnprintf_getlease(arg->val, bf, size);
}

size_t syscall_arg__scnprintf_fcntl_cmd(char *bf, size_t size, struct syscall_arg *arg)
{
    if (arg->val == F_GETFL) {
        syscall_arg__set_ret_scnprintf(arg, syscall_arg__scnprintf_open_flags);
        goto mask_arg;
    }
    if (arg->val == F_GETFD) {
        syscall_arg__set_ret_scnprintf(arg, syscall_arg__scnprintf_fcntl_getfd);
        goto mask_arg;
    }
    if (arg->val == F_DUPFD_CLOEXEC || arg->val == F_DUPFD) {
        syscall_arg__set_ret_scnprintf(arg, syscall_arg__scnprintf_fd);
        goto out;
    }
    if (arg->val == F_GETOWN) {
        syscall_arg__set_ret_scnprintf(arg, syscall_arg__scnprintf_pid);
        goto mask_arg;
    }
    if (arg->val == F_GETLEASE) {
        syscall_arg__set_ret_scnprintf(arg, syscall_arg__scnprintf_fcntl_getlease);
        goto mask_arg;
    }
    /*
     * Some commands ignore the third fcntl argument, "arg", so mask it
     */
    if (arg->val == F_GET_SEALS ||
        arg->val == F_GETSIG) {
mask_arg:
        arg->mask |= (1 << 2);
    }
out:
    return syscall_arg__scnprintf_strarrays(bf, size, arg);
}

size_t syscall_arg__scnprintf_fcntl_arg(char *bf, size_t size, struct syscall_arg *arg)
{
    int cmd = syscall_arg__val(arg, 1);

    if (cmd == F_DUPFD)
        return syscall_arg__scnprintf_fd(bf, size, arg);

    if (cmd == F_SETFD)
        return fcntl__scnprintf_getfd(arg->val, bf, size);

    if (cmd == F_SETFL)
        return open__scnprintf_flags(arg->val, bf, size);

    if (cmd == F_SETOWN)
        return syscall_arg__scnprintf_pid(bf, size, arg);

    if (cmd == F_SETLEASE)
        return fcntl__scnprintf_getlease(arg->val, bf, size);
    /*
     * We still don't grab the contents of pointers on entry or exit,
     * so just print them as hex numbers
     */
    if (cmd == F_SETLK || cmd == F_SETLKW || cmd == F_GETLK ||
        cmd == F_OFD_SETLK || cmd == F_OFD_SETLKW || cmd == F_OFD_GETLK ||
        cmd == F_GETOWN_EX || cmd == F_SETOWN_EX ||
        cmd == F_GET_RW_HINT || cmd == F_SET_RW_HINT ||
        cmd == F_GET_FILE_RW_HINT || cmd == F_SET_FILE_RW_HINT)
        return syscall_arg__scnprintf_hex(bf, size, arg);

    return syscall_arg__scnprintf_long(bf, size, arg);
}