Delete LIBC_CALLS_HEFTY

- fork() no longer requires malloc()
- readdir() moved to LIBC_STDIO
- Custom APIs moved to LIBC_X

libc/log/backtrace2.c

@@ -48,7 +48,6 @@ static int PrintBacktraceUsingAddr2line(int fd, const struct StackFrame *bp) {
   struct Garbages *garbage;
   sigset_t chldmask, savemask;
   const struct StackFrame *frame;
-  struct sigaction ignore, saveint, savequit;
   const char *debugbin, *p1, *p2, *p3, *addr2line;
   char buf[kBacktraceBufSize], *argv[kBacktraceMaxFrames];
   if (IsOpenbsd()) return -1;
@@ -77,18 +76,11 @@ static int PrintBacktraceUsingAddr2line(int fd, const struct StackFrame *bp) {
     j += uint64toarray_radix16(addr - 1, buf + j) + 1;
   }
   argv[i++] = NULL;
-  ignore.sa_flags = 0;
-  ignore.sa_handler = SIG_IGN;
-  sigemptyset(&ignore.sa_mask);
-  sigaction(SIGINT, &ignore, &saveint);
-  sigaction(SIGQUIT, &ignore, &savequit);
   sigemptyset(&chldmask);
   sigaddset(&chldmask, SIGCHLD);
   sigprocmask(SIG_BLOCK, &chldmask, &savemask);
   pipe(pipefds);
   if (!(pid = vfork())) {
-    sigaction(SIGINT, &saveint, NULL);
-    sigaction(SIGQUIT, &savequit, NULL);
     sigprocmask(SIG_SETMASK, &savemask, NULL);
     dup2(pipefds[1], 1);
     close(pipefds[0]);
@@ -124,8 +116,6 @@ static int PrintBacktraceUsingAddr2line(int fd, const struct StackFrame *bp) {
     if (errno == EINTR) continue;
     return -1;
   }
-  sigaction(SIGINT, &saveint, NULL);
-  sigaction(SIGQUIT, &savequit, NULL);
   sigprocmask(SIG_SETMASK, &savemask, NULL);
   if (WIFEXITED(ws) && !WEXITSTATUS(ws)) {
     return 0;

libc/log/commandvenv.c

@@ -25,19 +25,30 @@
 
 /**
  * Finds full executable path in overridable way.
+ *
+ * This is a higher level version of the commandv() function. Programs
+ * that spawn subprocesses can use this function to determine the path
+ * at startup.
+ *
+ * @param var is environment variable which may be used to override
+ *     PATH search, and it can force a NULL result if it's empty
+ * @param cmd is name of program, which is returned asap if it's an
+ *     absolute path
+ * @return pointer to exe path string, or NULL if it couldn't be found
+ *     or the environment variable was empty; noting that the caller
+ *     should copy this string before saving it
  */
-nodiscard char *commandvenv(const char *var, const char *cmd) {
+const char *commandvenv(const char *var, const char *cmd) {
   const char *exepath;
-  char pathbuf[PATH_MAX];
+  static char pathbuf[PATH_MAX];
+  if (*cmd == '/' || *cmd == '\\') return cmd;
   if ((exepath = getenv(var))) {
-    if (!isempty(exepath) && access(exepath, X_OK) != -1) {
-      return strdup(exepath);
+    if (isempty(exepath)) return NULL;
+    if (access(exepath, X_OK) != -1) {
+      return exepath;
     } else {
       return NULL;
     }
-  } else if ((exepath = commandv(cmd, pathbuf))) {
-    return strdup(exepath);
-  } else {
-    return NULL;
   }
+  return commandv(cmd, pathbuf);
 }

libc/log/log.h

@@ -40,7 +40,7 @@ void memsummary(int);                  /* light version of same thing */
 uint16_t getttycols(uint16_t);
 int getttysize(int, struct winsize *) paramsnonnull();
 bool IsTerminalInarticulate(void) nosideeffect;
-char *commandvenv(const char *, const char *) nodiscard;
+const char *commandvenv(const char *, const char *);
 const char *GetAddr2linePath(void);
 const char *GetGdbPath(void);
 

libc/log/log.mk

@@ -28,7 +28,6 @@ LIBC_LOG_A_CHECKS =					\
 LIBC_LOG_A_DIRECTDEPS =					\
 	LIBC_ALG					\
 	LIBC_CALLS					\
-	LIBC_CALLS_HEFTY				\
 	LIBC_ELF					\
 	LIBC_FMT					\
 	LIBC_INTRIN					\