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strace: Allow "strace command" to trace a process from start to finish.
Tracing a specific pid is now done via "strace -p PID". To ensure we don't miss any syscalls, we fork and have the child immediately SIGSTOP itself. Then when the parent has set up the systrace() fd, we send SIGCONT to the child which then execs the command. :^)
This commit is contained in:
parent
25ddcd1022
commit
2a65f0ee4f
Notes:
sideshowbarker
2024-07-19 14:20:35 +09:00
Author: https://github.com/awesomekling Commit: https://github.com/SerenityOS/serenity/commit/2a65f0ee4fa
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@ -1,22 +1,58 @@
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <signal.h>
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#include <AK/Assertions.h>
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#include <AK/Types.h>
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#include <Kernel/Syscall.h>
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static int usage()
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{
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printf("usage: strace [-p PID] [command...]\n");
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return 0;
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}
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int main(int argc, char** argv)
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{
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if (argc < 2)
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return 1;
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if (argc == 1)
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return usage();
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pid_t pid = -1;
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bool pid_is_child = false;
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if (!strcmp(argv[1], "-p")) {
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if (argc != 3)
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return usage();
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pid = atoi(argv[2]);
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} else {
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pid_is_child = true;
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pid = fork();
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if (!pid) {
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kill(getpid(), SIGSTOP);
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int rc = execvp(argv[1], &argv[1]);
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if (rc < 0) {
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perror("execvp");
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exit(1);
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}
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ASSERT_NOT_REACHED();
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}
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}
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int pid = atoi(argv[1]);
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int fd = systrace(pid);
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if (fd < 0) {
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perror("systrace");
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return 1;
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}
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if (pid_is_child) {
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int rc = kill(pid, SIGCONT);
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if (rc < 0) {
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perror("kill(pid, SIGCONT)");
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return 1;
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}
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}
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for (;;) {
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dword call[5];
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int nread = read(fd, &call, sizeof(call));
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return 1;
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}
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ASSERT(nread == sizeof(call));
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printf("%s(%#x, %#x, %#x) = %#x\n", Syscall::to_string((Syscall::Function)call[0]), call[1], call[2], call[3], call[4]);
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fprintf(stderr, "%s(%#x, %#x, %#x) = %#x\n", Syscall::to_string((Syscall::Function)call[0]), call[1], call[2], call[3], call[4]);
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}
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int rc = close(fd);
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