Wanted to use latrace on an app that was using setjmp/longjmp; and to avoid latrace causing a crash had to use the patch below. "latrace -Ap -n setjmp ..." was enough to make things work.

While doing this noticed the LA_SYMB_NOPLTEXIT omission for the '-s syms' case; not knowing if that was intentional i did not change that.

artur From: Artur Skawina <art.08.09(a)gmail.com&gt; Date: Wed, 13 Oct 2010 18:42:57 +0000 Subject: [PATCH] Add '-n' option, allowing to skip tracing certain symbols Makes it possible omit tracing just some calls, like 'setjmp'. ---  doc/latrace.txt  |    5 ++++-  src/audit-init.c |    7 +++++++  src/audit.c      |    5 +++++  src/config.c     |   11 ++++++++++-  src/config.h     |    4 ++++  5 files changed, 30 insertions(+), 2 deletions(-) diff --git a/doc/latrace.txt b/doc/latrace.txt index b24742a..ab2044d 100644 --- a/doc/latrace.txt +++ b/doc/latrace.txt @@ -10,7 +10,7 @@ latrace - LD_AUDIT 2.4+ libc frontend  SYNOPSIS  -------- -*latrace* [-ltfsbcCpADaoyIiBdvTFELVh] command [arg ... ] +*latrace* [-ltfsnbcCpADaoyIiBdvTFELVh] command [arg ... ]  DESCRIPTION @@ -45,6 +45,9 @@ OPTIONS  *-s, --sym sym1[,sym2,...]*::        audit symbols sym1, sym2 ... +*-n, --omit-sym sym1[,sym2,...]*:: +       omit symbols sym1, sym2 ... +  *-S, --timestamp*::        display timestamp for each symbol diff --git a/src/audit-init.c b/src/audit-init.c index 81ab1e5..322efe0 100644 --- a/src/audit-init.c +++ b/src/audit-init.c @@ -189,6 +189,13 @@ int audit_init(int argc, char **argv, char **env)                return -1;        } +       /* -n */ +       if ((*lt_sh(&cfg, skipsymbols)) && +           (-1 == (cfg.skipsymbols_cnt = get_names(&cfg, lt_sh(&cfg, skipsymbols), cfg.skipsymbols)))) { +               printf("latrace failed to parse symbols to omit\n"); +               return -1; +       } +        /* -b */        if ((*lt_sh(&cfg, flow_below)) &&            (-1 == (cfg.flow_below_cnt = get_names(&cfg, lt_sh(&cfg, flow_below), cfg.flow_below)))) { diff --git a/src/audit.c b/src/audit.c index 2a97b75..2494d93 100644 --- a/src/audit.c +++ b/src/audit.c @@ -234,6 +234,11 @@ static unsigned int la_symbind(const char *symname)                        flags = 0;        } +       if (cfg.skipsymbols_cnt) { +               if (check_names((char*) symname, cfg.skipsymbols)) +                       flags = LA_SYMB_NOPLTENTER|LA_SYMB_NOPLTEXIT; +       } +        return flags;  } diff --git a/src/config.c b/src/config.c index 3f3145c..ba222d3 100644 --- a/src/config.c +++ b/src/config.c @@ -34,6 +34,7 @@ static void usage()        printf("    -t, --libs-to lib1,lib2...      audit to lib1, lib2 ...\n");        printf("    -f, --libs-from lib1,lib2...    audit from lib1, lib2 ...\n");        printf("    -s, --sym sym1,sym2...          audit symbols sym1, sym2 ... \n"); +       printf("    -n, --omit-sym sym1,sym2...     omit symbols sym1, sym2 ... \n");        printf("    -L, --lib-subst s1,s2...        objsearch LD_AUDIT interface (see man page)\n");        printf("\n");        printf("    -c, --counts                    display statistics counts of symbols\n"); @@ -127,6 +128,7 @@ int lt_config(struct lt_config_app *cfg, int argc, char **argv)                int option_index = 0;                static struct option long_options[] = {                        {"sym", required_argument, 0, 's'}, +                       {"omit-sym", required_argument, 0, 'n'},                        {"libs", required_argument, 0, 'l'},                        {"libs-to", required_argument, 0, 't'},                        {"libs-from", required_argument, 0, 'f'}, @@ -157,7 +159,7 @@ int lt_config(struct lt_config_app *cfg, int argc, char **argv)                        {0, 0, 0, 0}                }; -               c = getopt_long(argc, argv, "+s:l:t:f:vhi:BdISb:cC:y:YL:po:a:ADVTFERq", +               c = getopt_long(argc, argv, "+s:n:l:t:f:vhi:BdISb:cC:y:YL:po:a:ADVTFERq",                                        long_options, &option_index);                if (c == -1) @@ -192,6 +194,13 @@ int lt_config(struct lt_config_app *cfg, int argc, char **argv)                        strncpy(lt_sh(cfg, symbols), optarg, strlen(optarg));                        break; +               case 'n': +                       if (strlen(optarg) > LT_SYMBOLS_MAXSIZE) +                               return -1; + +                       strncpy(lt_sh(cfg, skipsymbols), optarg, strlen(optarg)); +                       break; +                case 'b':                        if (strlen(optarg) > LT_SYMBOLS_MAXSIZE)                                return -1; diff --git a/src/config.h b/src/config.h index 2a36c58..71f319a 100644 --- a/src/config.h +++ b/src/config.h @@ -84,6 +84,7 @@ struct lt_config_shared {  #define LT_SYMBOLS_MAXSIZE  200        char symbols[LT_SYMBOLS_MAXSIZE]; +       char skipsymbols[LT_SYMBOLS_MAXSIZE];        char flow_below[LT_SYMBOLS_MAXSIZE]; @@ -186,6 +187,9 @@ struct lt_config_audit {        char *symbols[LT_NAMES_MAX];        int symbols_cnt; +       char *skipsymbols[LT_NAMES_MAX]; +       int skipsymbols_cnt; +        char *flow_below[LT_NAMES_MAX];        int flow_below_cnt; --