/* Do not run this as root, heh */

#include    <sys/syscall.h>
#include    <unistd.h>
#include    <stdlib.h>
#include    <libgen.h>
#include    <limits.h>
#include    <stdio.h>
#include    <string.h>
#include    <ctype.h>
#include    <err.h>

#define SYSCALLS_FILE	"/usr/include/sys/syscall.h"
#define SYSDEF_PREFIX	"#define\tSYS_"
#define SYSCALL_LEN	32

int
main(int ac, char *av[])
{
    FILE	    *sfp;
    char	    lnbuf[BUFSIZ + 1];
    char	    sclist[SYS_MAXSYSCALL][SYSCALL_LEN];
    register int    si = 0;
    int		    li, sl, sn,
		    ret = -1;
    char	    *ae;
    union
    {
	int	u_int;
	char	*u_str;
    }		    *ap;

    if (ac < 2)
	fprintf(stderr, "Usage %s <syscall>\n", basename(av[0]));
    if (!(sfp = fopen(SYSCALLS_FILE, "rt")))
	err(1, "%s", SYSCALLS_FILE);
    while (fgets(lnbuf, BUFSIZ + 1, sfp) != 0)
    {
	if (!strncmp(lnbuf, SYSDEF_PREFIX, sizeof(SYSDEF_PREFIX) -1))
	{
	    li = sizeof(SYSDEF_PREFIX) - 1;
	    while (!isspace(lnbuf[li]))
		++li;
	    sl = li - (sizeof(SYSDEF_PREFIX) - 1);
	    sn = (int)strtol(lnbuf + li, NULL, 10);
	    while (si < sn)
		sclist[si++][0] = '\0';
	    bcopy(lnbuf + (sizeof(SYSDEF_PREFIX) - 1),
		    sclist[si++],
		    sl);
	}
    }
    if (!feof(sfp))
	err(1, "read error");
    if (fclose(sfp) == EOF)
	err(1, "close");
    for (;si > 0; --si)
	if (!strcmp(av[1], sclist[si]))
	{
	    strtol(*av, &ae, 10);
	    if ((ae - *av) == strlen(*av))
		/* XXX */

	    ret = syscall(si);
	    printf("%s returns %d\n", sclist[si], ret);
	}
    if (ret == -1)
	warnx("no such syscall %s\n", av[1]);
    return ret;
}