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freebsd-dev/usr.bin/truss/syscalls.c
Alfred Perlstein 3969f0fa13 Decode chroot(2) args. 
Approved by: re
2005-06-14 21:51:08 +00:00

727 lines
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/*
* Copryight 1997 Sean Eric Fagan
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Sean Eric Fagan
* 4. Neither the name of the author may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
/*
* This file has routines used to print out system calls and their
* arguments.
*/
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <poll.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "truss.h"
#include "extern.h"
#include "syscall.h"
/*
* This should probably be in its own file.
*/
struct syscall syscalls[] = {
{ "fcntl", 1, 3,
{ { Int, 0 } , { Fcntl, 1 }, { Hex, 2 }}},
{ "readlink", 1, 3,
{ { String, 0 } , { Readlinkres | OUT, 1 }, { Int, 2 }}},
{ "lseek", 2, 3,
#ifdef __LP64__
{ { Int, 0 }, {Quad, 2 }, { Whence, 3 }}},
#else
{ { Int, 0 }, {Quad, 2 }, { Whence, 4 }}},
#endif
{ "linux_lseek", 2, 3,
{ { Int, 0 }, {Int, 1 }, { Whence, 2 }}},
{ "mmap", 2, 6,
#ifdef __LP64__
{ { Ptr, 0 }, {Int, 1}, {Mprot, 2}, {Mmapflags, 3}, {Int, 4}, {Quad, 5}}},
#else
{ { Ptr, 0 }, {Int, 1}, {Mprot, 2}, {Mmapflags, 3}, {Int, 4}, {Quad, 6}}},
#endif
{ "mprotect", 1, 3,
{ { Ptr, 0 }, {Int, 1}, {Mprot, 2}}},
{ "open", 1, 3,
{ { String | IN, 0} , { Hex, 1}, {Octal, 2}}},
{ "mkdir", 1, 2,
{ { String, 0} , {Octal, 1}}},
{ "linux_open", 1, 3,
{ { String, 0 }, { Hex, 1}, { Octal, 2 }}},
{ "close", 1, 1,
{ { Int, 0 } } },
{ "link", 0, 2,
{ { String, 0 }, { String, 1 }}},
{ "unlink", 0, 1,
{ { String, 0 }}},
{ "chdir", 0, 1,
{ { String, 0 }}},
{ "chroot", 0, 1,
{ { String, 0 }}},
{ "mknod", 0, 3,
{ { String, 0 }, { Octal, 1 }, { Int, 3 }}},
{ "chmod", 0, 2,
{ { String, 0 }, { Octal, 1 }}},
{ "chown", 0, 3,
{ { String, 0 }, { Int, 1 }, { Int, 2 }}},
{ "mount", 0, 4,
{ { String, 0 }, { String, 1 }, { Int, 2 }, { Ptr, 3 }}},
{ "umount", 0, 2,
{ { String, 0 }, { Int, 2 }}},
{ "fstat", 1, 2,
{ { Int, 0}, {Ptr | OUT , 1 }}},
{ "stat", 1, 2,
{ { String | IN, 0 }, { Ptr | OUT, 1 }}},
{ "lstat", 1, 2,
{ { String | IN, 0 }, { Ptr | OUT, 1 }}},
{ "linux_newstat", 1, 2,
{ { String | IN, 0 }, { Ptr | OUT, 1 }}},
{ "linux_newfstat", 1, 2,
{ { Int, 0 }, { Ptr | OUT, 1 }}},
{ "write", 1, 3,
{ { Int, 0 }, { Ptr | IN, 1 }, { Int, 2 }}},
{ "ioctl", 1, 3,
{ { Int, 0 }, { Ioctl, 1 }, { Hex, 2 }}},
{ "break", 1, 1, { { Hex, 0 }}},
{ "exit", 0, 1, { { Hex, 0 }}},
{ "access", 1, 2, { { String | IN, 0 }, { Int, 1 }}},
{ "sigaction", 1, 3,
{ { Signal, 0 }, { Sigaction | IN, 1 }, { Sigaction | OUT, 2 }}},
{ "accept", 1, 3,
{ { Hex, 0 }, { Sockaddr | OUT, 1 }, { Ptr | OUT, 2 } } },
{ "bind", 1, 3,
{ { Hex, 0 }, { Sockaddr | IN, 1 }, { Int, 2 } } },
{ "connect", 1, 3,
{ { Hex, 0 }, { Sockaddr | IN, 1 }, { Int, 2 } } },
{ "getpeername", 1, 3,
{ { Hex, 0 }, { Sockaddr | OUT, 1 }, { Ptr | OUT, 2 } } },
{ "getsockname", 1, 3,
{ { Hex, 0 }, { Sockaddr | OUT, 1 }, { Ptr | OUT, 2 } } },
{ "recvfrom", 1, 6,
{ { Hex, 0 }, { Ptr | IN, 1 }, { Int, 3 }, { Hex, 3 }, { Sockaddr | OUT, 4 }, { Ptr | OUT, 5 } } },
{ "sendto", 1, 6,
{ { Hex, 0 }, { Ptr | IN, 1 }, { Int, 3 }, { Hex, 3 }, { Sockaddr | IN, 4 }, { Ptr | IN, 5 } } },
{ "execve", 1, 3,
{ { String | IN, 0 }, { StringArray | IN, 1 }, { StringArray | IN, 2 } } },
{ "linux_execve", 1, 3,
{ { String | IN, 0 }, { StringArray | IN, 1 }, { StringArray | IN, 2 } } },
{ "kldload", 0, 1, { { String | IN, 0 }}},
{ "kldunload", 0, 1, { { Int, 0 }}},
{ "kldfind", 0, 1, { { String | IN, 0 }}},
{ "kldnext", 0, 1, { { Int, 0 }}},
{ "kldstat", 0, 2, { { Int, 0 }, { Ptr, 1 }}},
{ "kldfirstmod", 0, 1, { { Int, 0 }}},
{ "nanosleep", 0, 1, { { Timespec, 0 }}},
{ "select", 1, 5, { { Int, 0 }, { Fd_set, 1 }, { Fd_set, 2 }, { Fd_set, 3 }, { Timeval, 4 }}},
{ "poll", 1, 3, { { Pollfd, 0 }, { Int, 1 }, { Int, 2 }}},
{ "gettimeofday", 1, 2, { { Timeval | OUT, 0 }, { Ptr, 1 }}},
{ "clock_gettime", 1, 2, { { Int, 0 }, { Timeval | OUT, 1 }}},
{ "recvfrom", 1, 6, { { Int, 0 }, { Ptr | OUT, 1 }, { Int, 2 }, { Int, 3 }, { Sockaddr | OUT, 4}, {Ptr | OUT, 5}}},
{ "getitimer", 1, 2, { { Int, 0 }, { Itimerval | OUT, 2 }}},
{ "setitimer", 1, 3, { { Int, 0 }, { Itimerval, 1} , { Itimerval | OUT, 2 }}},
{ "utimes", 1, 2,
{ { String | IN, 0 }, { Timeval | IN, 1 }}},
{ "lutimes", 1, 2,
{ { String | IN, 0 }, { Timeval | IN, 1 }}},
{ "futimes", 1, 2,
{ { Int, 0 }, { Timeval | IN, 1 }}},
{ "chflags", 1, 2,
{ { String | IN, 0 }, { Hex, 1 }}},
{ "lchflags", 1, 2,
{ { String | IN, 0 }, { Hex, 1 }}},
{ 0, 0, 0, { { 0, 0 }}},
};
/*
* If/when the list gets big, it might be desirable to do it
* as a hash table or binary search.
*/
struct syscall *
get_syscall(const char *name) {
struct syscall *sc = syscalls;
if (name == NULL)
return (NULL);
while (sc->name) {
if (!strcmp(name, sc->name))
return sc;
sc++;
}
return NULL;
}
/*
* get_struct
*
* Copy a fixed amount of bytes from the process.
*/
static int
get_struct(int procfd, void *offset, void *buf, int len) {
if (pread(procfd, buf, len, (uintptr_t)offset) != len)
return -1;
return 0;
}
/*
* get_string
* Copy a string from the process. Note that it is
* expected to be a C string, but if max is set, it will
* only get that much.
*/
char *
get_string(int procfd, void *offset, int max) {
char *buf;
int size, len, c, fd;
FILE *p;
if ((fd = dup(procfd)) == -1)
err(1, "dup");
if ((p = fdopen(fd, "r")) == NULL)
err(1, "fdopen");
buf = malloc( size = (max ? max : 64 ) );
len = 0;
buf[0] = 0;
if (fseeko(p, (uintptr_t)offset, SEEK_SET) == 0) {
while ((c = fgetc(p)) != EOF) {
buf[len++] = c;
if (c == 0 || len == max) {
buf[len] = 0;
break;
}
if (len == size) {
char *tmp;
tmp = realloc(buf, size+64);
if (tmp == NULL) {
buf[len] = 0;
break;
}
size += 64;
buf = tmp;
}
}
}
fclose(p);
return (buf);
}
/*
* Remove a trailing '|' in a string, useful for fixup after decoding
* a "flags" argument.
*/
void
remove_trailing_or(char *str)
{
if (str != NULL && (str = rindex(str, '|')) != NULL && str[1] == '\0')
*str = '\0';
}
/*
* print_arg
* Converts a syscall argument into a string. Said string is
* allocated via malloc(), so needs to be free()'d. The file
* descriptor is for the process' memory (via /proc), and is used
* to get any data (where the argument is a pointer). sc is
* a pointer to the syscall description (see above); args is
* an array of all of the system call arguments.
*/
char *
print_arg(int fd, struct syscall_args *sc, unsigned long *args, long retval) {
char *tmp = NULL;
switch (sc->type & ARG_MASK) {
case Hex:
asprintf(&tmp, "0x%lx", args[sc->offset]);
break;
case Octal:
asprintf(&tmp, "0%lo", args[sc->offset]);
break;
case Int:
asprintf(&tmp, "%ld", args[sc->offset]);
break;
case String:
{
char *tmp2;
tmp2 = get_string(fd, (void*)args[sc->offset], 0);
asprintf(&tmp, "\"%s\"", tmp2);
free(tmp2);
}
break;
case StringArray:
{
int num, size, i;
char *tmp2;
char *string;
char *strarray[100]; /* XXX This is ugly. */
if (get_struct(fd, (void *)args[sc->offset], (void *)&strarray,
sizeof(strarray)) == -1) {
err(1, "get_struct %p", (void *)args[sc->offset]);
}
num = 0;
size = 0;
/* Find out how large of a buffer we'll need. */
while (strarray[num] != NULL) {
string = get_string(fd, (void*)strarray[num], 0);
size += strlen(string);
free(string);
num++;
}
size += 4 + (num * 4);
tmp = (char *)malloc(size);
tmp2 = tmp;
tmp2 += sprintf(tmp2, " [");
for (i = 0; i < num; i++) {
string = get_string(fd, (void*)strarray[i], 0);
tmp2 += sprintf(tmp2, " \"%s\"%c", string, (i+1 == num) ? ' ' : ',');
free(string);
}
tmp2 += sprintf(tmp2, "]");
}
break;
#ifdef __LP64__
case Quad:
asprintf(&tmp, "0x%lx", args[sc->offset]);
break;
#else
case Quad:
{
unsigned long long ll;
ll = *(unsigned long long *)(args + sc->offset);
asprintf(&tmp, "0x%llx", ll);
break;
}
#endif
case Ptr:
asprintf(&tmp, "0x%lx", args[sc->offset]);
break;
case Readlinkres:
{
char *tmp2;
if (retval == -1) {
tmp = strdup("");
break;
}
tmp2 = get_string(fd, (void*)args[sc->offset], retval);
asprintf(&tmp, "\"%s\"", tmp2);
free(tmp2);
}
break;
case Ioctl:
{
const char *temp = ioctlname(args[sc->offset]);
if (temp)
tmp = strdup(temp);
else
asprintf(&tmp, "0x%lx", args[sc->offset]);
}
break;
case Timespec:
{
struct timespec ts;
if (get_struct(fd, (void *)args[sc->offset], &ts, sizeof(ts)) != -1)
asprintf(&tmp, "{%jd %jd}", (intmax_t)ts.tv_sec, (intmax_t)ts.tv_nsec);
else
asprintf(&tmp, "0x%lx", args[sc->offset]);
}
break;
case Timeval:
{
struct timeval tv;
if (get_struct(fd, (void *)args[sc->offset], &tv, sizeof(tv)) != -1)
asprintf(&tmp, "{%jd %jd}", (intmax_t)tv.tv_sec, (intmax_t)tv.tv_usec);
else
asprintf(&tmp, "0x%lx", args[sc->offset]);
}
break;
case Itimerval:
{
struct itimerval itv;
if (get_struct(fd, (void *)args[sc->offset], &itv, sizeof(itv)) != -1)
asprintf(&tmp, "{%jd %jd, %jd %jd}",
(intmax_t)itv.it_interval.tv_sec,
(intmax_t)itv.it_interval.tv_usec,
(intmax_t)itv.it_value.tv_sec,
(intmax_t)itv.it_value.tv_usec);
else
asprintf(&tmp, "0x%lx", args[sc->offset]);
}
break;
case Pollfd:
{
/*
* XXX: A Pollfd argument expects the /next/ syscall argument to be
* the number of fds in the array. This matches the poll syscall.
*/
struct pollfd *pfd;
int numfds = args[sc->offset+1];
int bytes = sizeof(struct pollfd) * numfds;
int i, tmpsize, u, used;
const int per_fd = 100;
if ((pfd = malloc(bytes)) == NULL)
err(1, "Cannot malloc %d bytes for pollfd array", bytes);
if (get_struct(fd, (void *)args[sc->offset], pfd, bytes) != -1) {
used = 0;
tmpsize = 1 + per_fd * numfds + 2;
if ((tmp = malloc(tmpsize)) == NULL)
err(1, "Cannot alloc %d bytes for poll output", tmpsize);
tmp[used++] = '{';
for (i = 0; i < numfds; i++) {
#define POLLKNOWN_EVENTS \
(POLLIN | POLLPRI | POLLOUT | POLLERR | POLLHUP | POLLNVAL | \
POLLRDNORM |POLLRDBAND | POLLWRBAND | POLLINIGNEOF)
u = snprintf(tmp + used, per_fd,
"%s%d 0x%hx%s%s%s%s%s%s%s%s%s ",
i > 0 ? " " : "",
pfd[i].fd,
pfd[i].events & ~POLLKNOWN_EVENTS,
pfd[i].events & POLLIN ? "" : "|IN",
pfd[i].events & POLLPRI ? "" : "|PRI",
pfd[i].events & POLLOUT ? "" : "|OUT",
pfd[i].events & POLLERR ? "" : "|ERR",
pfd[i].events & POLLHUP ? "" : "|HUP",
pfd[i].events & POLLNVAL ? "" : "|NVAL",
pfd[i].events & POLLRDNORM ? "" : "|RDNORM",
pfd[i].events & POLLRDBAND ? "" : "|RDBAND",
pfd[i].events & POLLWRBAND ? "" : "|WRBAND");
if (u > 0)
used += u < per_fd ? u : per_fd;
}
tmp[used++] = '}';
tmp[used++] = '\0';
} else
asprintf(&tmp, "0x%lx", args[sc->offset]);
free(pfd);
}
break;
case Fd_set:
{
/*
* XXX: A Fd_set argument expects the /first/ syscall argument to be
* the number of fds in the array. This matches the select syscall.
*/
fd_set *fds;
int numfds = args[0];
int bytes = _howmany(numfds, _NFDBITS) * _NFDBITS;
int i, tmpsize, u, used;
const int per_fd = 20;
if ((fds = malloc(bytes)) == NULL)
err(1, "Cannot malloc %d bytes for fd_set array", bytes);
if (get_struct(fd, (void *)args[sc->offset], fds, bytes) != -1) {
used = 0;
tmpsize = 1 + numfds * per_fd + 2;
if ((tmp = malloc(tmpsize)) == NULL)
err(1, "Cannot alloc %d bytes for fd_set output", tmpsize);
tmp[used++] = '{';
for (i = 0; i < numfds; i++) {
if (FD_ISSET(i, fds)) {
u = snprintf(tmp + used, per_fd, "%d ", i);
if (u > 0)
used += u < per_fd ? u : per_fd;
}
}
if (tmp[used-1] == ' ')
used--;
tmp[used++] = '}';
tmp[used++] = '\0';
} else
asprintf(&tmp, "0x%lx", args[sc->offset]);
free(fds);
}
break;
case Signal:
{
long sig;
sig = args[sc->offset];
tmp = strsig(sig);
if (tmp == NULL)
asprintf(&tmp, "%ld", sig);
}
break;
case Fcntl:
{
switch (args[sc->offset]) {
#define S(a) case a: tmp = strdup(#a); break;
S(F_DUPFD);
S(F_GETFD);
S(F_SETFD);
S(F_GETFL);
S(F_SETFL);
S(F_GETOWN);
S(F_SETOWN);
S(F_GETLK);
S(F_SETLK);
S(F_SETLKW);
#undef S
}
if (tmp == NULL)
asprintf(&tmp, "0x%lx", args[sc->offset]);
}
break;
case Mprot:
{
#define S(a) ((args[sc->offset] & a) ? #a "|" : "")
asprintf(&tmp, "(0x%lx)%s%s%s%s", args[sc->offset],
S(PROT_NONE), S(PROT_READ), S(PROT_WRITE), S(PROT_EXEC));
#undef S
remove_trailing_or(tmp);
}
break;
case Mmapflags:
{
#define S(a) ((args[sc->offset] & a) ? #a "|" : "")
asprintf(&tmp, "(0x%lx)%s%s%s%s%s%s%s%s", args[sc->offset],
S(MAP_ANON), S(MAP_FIXED), S(MAP_HASSEMAPHORE),
S(MAP_NOCORE), S(MAP_NOSYNC), S(MAP_PRIVATE),
S(MAP_SHARED), S(MAP_STACK));
#undef S
remove_trailing_or(tmp);
}
break;
case Whence:
{
switch (args[sc->offset]) {
#define S(a) case a: tmp = strdup(#a); break;
S(SEEK_SET);
S(SEEK_CUR);
S(SEEK_END);
#undef S
default: asprintf(&tmp, "0x%lx", args[sc->offset]); break;
}
}
break;
case Sockaddr:
{
struct sockaddr_storage ss;
char addr[64];
struct sockaddr_in *lsin;
struct sockaddr_in6 *lsin6;
struct sockaddr_un *sun;
struct sockaddr *sa;
char *p;
u_char *q;
int i;
if (args[sc->offset] == 0) {
asprintf(&tmp, "NULL");
break;
}
/* yuck: get ss_len */
if (get_struct(fd, (void *)args[sc->offset], (void *)&ss,
sizeof(ss.ss_len) + sizeof(ss.ss_family)) == -1)
err(1, "get_struct %p", (void *)args[sc->offset]);
/* sockaddr_un never have the length filled in! */
if (ss.ss_family == AF_UNIX) {
if (get_struct(fd, (void *)args[sc->offset], (void *)&ss,
sizeof(*sun))
== -1)
err(2, "get_struct %p", (void *)args[sc->offset]);
} else {
if (get_struct(fd, (void *)args[sc->offset], (void *)&ss, ss.ss_len)
== -1)
err(2, "get_struct %p", (void *)args[sc->offset]);
}
switch (ss.ss_family) {
case AF_INET:
lsin = (struct sockaddr_in *)&ss;
inet_ntop(AF_INET, &lsin->sin_addr, addr, sizeof addr);
asprintf(&tmp, "{ AF_INET %s:%d }", addr, htons(lsin->sin_port));
break;
case AF_INET6:
lsin6 = (struct sockaddr_in6 *)&ss;
inet_ntop(AF_INET6, &lsin6->sin6_addr, addr, sizeof addr);
asprintf(&tmp, "{ AF_INET6 [%s]:%d }", addr, htons(lsin6->sin6_port));
break;
case AF_UNIX:
sun = (struct sockaddr_un *)&ss;
asprintf(&tmp, "{ AF_UNIX \"%s\" }", sun->sun_path);
break;
default:
sa = (struct sockaddr *)&ss;
asprintf(&tmp, "{ sa_len = %d, sa_family = %d, sa_data = {%n%*s } }",
(int)sa->sa_len, (int)sa->sa_family, &i,
6 * (int)(sa->sa_len - ((char *)&sa->sa_data - (char *)sa)), "");
if (tmp != NULL) {
p = tmp + i;
for (q = (u_char *)&sa->sa_data; q < (u_char *)sa + sa->sa_len; q++)
p += sprintf(p, " %#02x,", *q);
}
}
}
break;
case Sigaction:
{
struct sigaction sa;
char *hand;
const char *h;
#define SA_KNOWN_FLAGS \
(SA_ONSTACK | SA_RESTART | SA_RESETHAND | SA_NOCLDSTOP | SA_NODEFER | \
SA_NOCLDWAIT | SA_SIGINFO)
if (get_struct(fd, (void *)args[sc->offset], &sa, sizeof(sa)) != -1) {
asprintf(&hand, "%p", sa.sa_handler);
if (sa.sa_handler == SIG_DFL)
h = "SIG_DFL";
else if (sa.sa_handler == SIG_IGN)
h = "SIG_IGN";
else
h = hand;
asprintf(&tmp, "{ %s 0x%x%s%s%s%s%s%s%s ss_t }",
h,
sa.sa_flags & ~SA_KNOWN_FLAGS,
sa.sa_flags & SA_ONSTACK ? "" : "|ONSTACK",
sa.sa_flags & SA_RESTART ? "" : "|RESTART",
sa.sa_flags & SA_RESETHAND ? "" : "|RESETHAND",
sa.sa_flags & SA_NOCLDSTOP ? "" : "|NOCLDSTOP",
sa.sa_flags & SA_NODEFER ? "" : "|NODEFER",
sa.sa_flags & SA_NOCLDWAIT ? "" : "|NOCLDWAIT",
sa.sa_flags & SA_SIGINFO ? "" : "|SIGINFO");
free(hand);
} else
asprintf(&tmp, "0x%lx", args[sc->offset]);
}
break;
}
return tmp;
}
#define timespecsubt(tvp, uvp, vvp) \
do { \
(vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
(vvp)->tv_nsec = (tvp)->tv_nsec - (uvp)->tv_nsec; \
if ((vvp)->tv_nsec < 0) { \
(vvp)->tv_sec--; \
(vvp)->tv_nsec += 1000000000; \
} \
} while (0)
/*
* print_syscall
* Print (to outfile) the system call and its arguments. Note that
* nargs is the number of arguments (not the number of words; this is
* potentially confusing, I know).
*/
void
print_syscall(struct trussinfo *trussinfo, const char *name, int nargs, char **s_args) {
int i;
int len = 0;
struct timespec timediff;
if (trussinfo->flags & FOLLOWFORKS)
len += fprintf(trussinfo->outfile, "%5d: ", trussinfo->pid);
if (name != NULL && (!strcmp(name, "execve") || !strcmp(name, "exit"))) {
clock_gettime(CLOCK_REALTIME, &trussinfo->after);
}
if (trussinfo->flags & ABSOLUTETIMESTAMPS) {
timespecsubt(&trussinfo->after, &trussinfo->start_time, &timediff);
len += fprintf(trussinfo->outfile, "%ld.%09ld ",
(long)timediff.tv_sec, timediff.tv_nsec);
}
if (trussinfo->flags & RELATIVETIMESTAMPS) {
timespecsubt(&trussinfo->after, &trussinfo->before, &timediff);
len += fprintf(trussinfo->outfile, "%ld.%09ld ",
(long)timediff.tv_sec, timediff.tv_nsec);
}
len += fprintf(trussinfo->outfile, "%s(", name);
for (i = 0; i < nargs; i++) {
if (s_args[i])
len += fprintf(trussinfo->outfile, "%s", s_args[i]);
else
len += fprintf(trussinfo->outfile, "<missing argument>");
len += fprintf(trussinfo->outfile, "%s", i < (nargs - 1) ? "," : "");
}
len += fprintf(trussinfo->outfile, ")");
for (i = 0; i < 6 - (len / 8); i++)
fprintf(trussinfo->outfile, "\t");
}
void
print_syscall_ret(struct trussinfo *trussinfo, const char *name, int nargs,
char **s_args, int errorp, long retval)
{
print_syscall(trussinfo, name, nargs, s_args);
if (errorp) {
fprintf(trussinfo->outfile, " ERR#%ld '%s'\n", retval, strerror(retval));
} else {
fprintf(trussinfo->outfile, " = %ld (0x%lx)\n", retval, retval);
}
}
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