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#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <limits.h>
#if HAVE_GETOPT_H
#define _GNU_SOURCE
#include <getopt.h>
#undef _GNU_SOURCE
#endif
#include "ltrace.h"
#include "options.h"
#include "defs.h"
static char *progname; /* Program name (`ltrace') */
FILE * output;
int opt_a = DEFAULT_ACOLUMN; /* default alignment column for results */
int opt_d = 0; /* debug */
int opt_i = 0; /* instruction pointer */
int opt_s = DEFAULT_STRLEN; /* default maximum # of bytes printed in strings */
int opt_S = 0; /* display syscalls */
int opt_L = 1; /* display library calls */
int opt_f = 0; /* trace child processes as they are created */
char * opt_u = NULL; /* username to run command as */
int opt_r = 0; /* print relative timestamp */
int opt_t = 0; /* print absolute timestamp */
#if HAVE_LIBIBERTY
int opt_C = 0; /* Demangle low-level symbol names into user-level names */
#endif
/* List of pids given to option -p: */
struct opt_p_t * opt_p = NULL; /* attach to process with a given pid */
/* List of function names given to option -e: */
struct opt_e_t * opt_e = NULL;
int opt_e_enable=1;
static void usage(void)
{
#if !(HAVE_GETOPT || HAVE_GETOPT_LONG)
fprintf(stdout, "Usage: %s [command [arg ...]]\n"
"Trace library calls of a given program.\n\n", progname);
#else
fprintf(stdout, "Usage: %s [option ...] [command [arg ...]]\n"
"Trace library calls of a given program.\n\n"
# if HAVE_GETOPT_LONG
" -d, --debug print debugging info.\n"
# else
" -d print debugging info.\n"
# endif
" -f follow forks.\n"
" -i print instruction pointer at time of library call.\n"
" -L do NOT display library calls.\n"
" -S display system calls.\n"
" -r print relative timestamps.\n"
" -t, -tt, -ttt print absolute timestamps.\n"
# if HAVE_LIBIBERTY
# if HAVE_GETOPT_LONG
" -C, --demangle decode low-level symbol names into user-level names.\n"
# else
" -C decode low-level symbol names into user-level names.\n"
# endif
# endif
# if HAVE_GETOPT_LONG
" -a, --align=COLUMN align return values in a secific column.\n"
# else
" -a COLUMN align return values in a secific column.\n"
# endif
" -s STRLEN specify the maximum string size to print.\n"
# if HAVE_GETOPT_LONG
" -o, --output=FILE write the trace output to that file.\n"
# else
" -o FILE write the trace output to that file.\n"
# endif
" -u USERNAME run command with the userid, groupid of username.\n"
" -p PID attach to the process with the process ID pid.\n"
" -e expr modify which events to trace.\n"
# if HAVE_GETOPT_LONG
" -h, --help display this help and exit.\n"
# else
" -h display this help and exit.\n"
# endif
# if HAVE_GETOPT_LONG
" -V, --version output version information and exit.\n"
# else
" -V output version information and exit.\n"
# endif
"\nReport bugs to Juan Cespedes <cespedes@debian.org>\n"
, progname);
#endif
}
static char * search_for_command(char * filename)
{
static char pathname[1024];
char *path;
int m, n;
if (strchr(filename, '/')) {
return filename;
}
for (path = getenv("PATH"); path && *path; path += m) {
if (strchr(path, ':')) {
n = strchr(path, ':') - path;
m = n + 1;
} else {
m = n = strlen(path);
}
strncpy(pathname, path, n); /* Possible buffer overrun */
if (n && pathname[n - 1] != '/') {
pathname[n++] = '/';
}
strcpy(pathname + n, filename);
if (!access(pathname, X_OK)) {
return pathname;
}
}
return filename;
}
char ** process_options(int argc, char **argv)
{
progname = argv[0];
output = stderr;
#if HAVE_GETOPT || HAVE_GETOPT_LONG
while(1) {
int c;
#if HAVE_GETOPT_LONG
int option_index = 0;
static struct option long_options[] = {
{ "align", 1, 0, 'a'},
{ "debug", 0, 0, 'd'},
# if HAVE_LIBIBERTY
{ "demangle", 0, 0, 'C'},
#endif
{ "help", 0, 0, 'h'},
{ "output", 1, 0, 'o'},
{ "version", 0, 0, 'V'},
{ 0, 0, 0, 0}
};
c = getopt_long(argc, argv, "+dfiLSrthV"
# if HAVE_LIBIBERTY
"C"
# endif
"a:s:o:u:p:e:", long_options, &option_index);
#else
c = getopt(argc, argv, "+dfiLSrthV"
# if HAVE_LIBIBERTY
"C"
# endif
"a:s:o:u:p:e:");
#endif
if (c==-1) {
break;
}
switch(c) {
case 'd': opt_d++;
break;
case 'f': opt_f = 1;
break;
case 'i': opt_i++;
break;
case 'L': opt_L = 0;
break;
case 'S': opt_S = 1;
break;
case 'r': opt_r++;
break;
case 't': opt_t++;
break;
#if HAVE_LIBIBERTY
case 'C': opt_C++;
break;
#endif
case 'a': opt_a = atoi(optarg);
break;
case 's': opt_s = atoi(optarg);
break;
case 'h': usage();
exit(0);
case 'o': output = fopen(optarg, "w");
if (!output) {
fprintf(stderr, "Can't open %s for output: %s\n", optarg, strerror(errno));
exit(1);
}
setvbuf(output, (char *)NULL, _IOLBF, 0);
break;
case 'u': opt_u = optarg;
break;
case 'p':
{
struct opt_p_t * tmp = malloc(sizeof(struct opt_p_t));
if (!tmp) {
perror("ltrace: malloc");
exit(1);
}
tmp->pid = atoi(optarg);
tmp->next = opt_p;
opt_p = tmp;
break;
}
case 'e':
{
char * str_e = strdup(optarg);
if (!str_e) {
perror("ltrace: strdup");
exit(1);
}
if (str_e[0]=='!') {
opt_e_enable=0;
str_e++;
}
while(*str_e) {
struct opt_e_t * tmp;
char *str2 = strchr(str_e,',');
if (str2) {
*str2 = '\0';
}
tmp = malloc(sizeof(struct opt_e_t));
if (!tmp) {
perror("ltrace: malloc");
exit(1);
}
tmp->name = str_e;
tmp->next = opt_e;
opt_e = tmp;
if (str2) {
str_e = str2+1;
} else {
break;
}
}
break;
}
case 'V': printf("ltrace version "
#ifdef VERSION
VERSION
#else
"???"
#endif
".\n"
"Copyright (C) 1997-1999 Juan Cespedes <cespedes@debian.org>.\n"
"This is free software; see the GNU General Public Licence\n"
"version 2 or later for copying conditions. There is NO warranty.\n");
exit(0);
default:
#if HAVE_GETOPT_LONG
fprintf(stderr, "Try `%s --help' for more information\n", progname);
#else
fprintf(stderr, "Try `%s -h' for more information\n", progname);
#endif
exit(1);
}
}
argc -= optind; argv += optind;
#endif
if (!opt_p && argc<1) {
fprintf(stderr, "%s: too few arguments\n", progname);
#if HAVE_GETOPT_LONG
fprintf(stderr, "Try `%s --help' for more information\n", progname);
#elif HAVE_GETOPT
fprintf(stderr, "Try `%s -h' for more information\n", progname);
#endif
exit(1);
}
if (opt_r && opt_t) {
fprintf(stderr, "%s: Incompatible options -r and -t\n", progname);
exit(1);
}
if (argc>0) {
command = search_for_command(argv[0]);
}
return &argv[0];
}
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