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| author | Sahil Siddiq <icegambit91@gmail.com> | 2023-03-20 11:10:56 +0530 |
|---|---|---|
| committer | Dmitry V. Levin <ldv@strace.io> | 2023-04-03 19:13:29 +0000 |
| commit | ac1d1e25d8d45b8e74ec4cde0f06a7b1df621304 (patch) | |
| tree | 0b2bffbdbdc2e14ed31c4aa8f8a77e6fb3ebcaca | |
| parent | d3b97fce7229fa8db7a87e03fcd445b8f97fe743 (diff) | |
| download | strace-ac1d1e25d8d45b8e74ec4cde0f06a7b1df621304.tar.gz | |
Introduce -l/--syscall-limit options
Add new options to detach strace after capturing the specified number
of syscalls.
* src/defs.h (syscall_limit): New variable declaration.
* src/strace.c (syscall_limit): New variable.
(usage): Mention new options.
(init): Handle them.
(next_event): Break the event loop when syscall_limit == 0.
* src/syscall.c (syscall_exiting_trace): Update syscall_limit.
Signed-off-by: Sahil Siddiq <icegambit91@gmail.com>
Resolves: https://github.com/strace/strace/issues/179
| -rw-r--r-- | src/defs.h | 1 | ||||
| -rw-r--r-- | src/strace.c | 20 | ||||
| -rw-r--r-- | src/syscall.c | 3 |
3 files changed, 23 insertions, 1 deletions
diff --git a/src/defs.h b/src/defs.h index 6c93d8460..245958772 100644 --- a/src/defs.h +++ b/src/defs.h @@ -513,6 +513,7 @@ extern int Tflag_scale; extern int Tflag_width; extern bool iflag; extern bool count_wallclock; +extern long long syscall_limit; struct path_set_item { const char *path; diff --git a/src/strace.c b/src/strace.c index 7a58bdbd6..cea445fe2 100644 --- a/src/strace.c +++ b/src/strace.c @@ -84,6 +84,7 @@ int Tflag_scale = 1000; int Tflag_width = 6; bool iflag; bool count_wallclock; +long long syscall_limit = -1; static bool nflag; static int tflag_scale = 1000000000; static unsigned tflag_width = 0; @@ -461,6 +462,10 @@ Statistics:\n\ -w, --summary-wall-clock\n\ summarise syscall latency (default is system time)\n\ \n\ +Stop condition:\n\ + -l LIMIT, --syscall-limit=LIMIT\n\ + Detach all tracees after tracing LIMIT syscalls\n\ +\n\ Tampering:\n\ -e inject=SET[:error=ERRNO|:retval=VALUE][:signal=SIG][:syscall=SYSCALL]\n\ [:delay_enter=DELAY][:delay_exit=DELAY]\n\ @@ -2245,7 +2250,7 @@ init(int argc, char *argv[]) #endif static const char optstring[] = - "+a:Ab:cCdDe:E:fFhiI:kno:O:p:P:qrs:S:tTu:U:vVwxX:yYzZ"; + "+a:Ab:cCdDe:E:fFhiI:kl:no:O:p:P:qrs:S:tTu:U:vVwxX:yYzZ"; enum { GETOPT_SECCOMP = 0x100, @@ -2291,6 +2296,7 @@ init(int argc, char *argv[]) { "instruction-pointer", no_argument, 0, 'i' }, { "interruptible", required_argument, 0, 'I' }, { "stack-traces", no_argument, 0, 'k' }, + { "syscall-limit", required_argument, 0, 'l' }, { "syscall-number", no_argument, 0, 'n' }, { "output", required_argument, 0, 'o' }, { "summary-syscall-overhead", required_argument, 0, 'O' }, @@ -2432,6 +2438,11 @@ init(int argc, char *argv[]) "build of strace"); #endif break; + case 'l': + syscall_limit = string_to_ulonglong(optarg); + if (syscall_limit <= 0) + error_opt_arg(c, lopt, optarg); + break; case 'n': nflag = 1; break; @@ -3353,6 +3364,13 @@ next_event(void) if (interrupted) return NULL; + if (syscall_limit == 0) { + if (!is_number_in_set(QUIET_ATTACH, quiet_set)) + error_msg("System call limit has been reached, detaching tracees"); + strace_child = 0; + return NULL; + } + invalidate_umove_cache(); struct tcb *tcp = NULL; diff --git a/src/syscall.c b/src/syscall.c index cc37aa30c..696b81dfd 100644 --- a/src/syscall.c +++ b/src/syscall.c @@ -849,6 +849,9 @@ syscall_exiting_trace(struct tcb *tcp, struct timespec *ts, int res) } } + if (syscall_limit != -1) + syscall_limit--; + tprint_arg_end(); tprint_space(); tabto(); |