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Introduce --strace flag for system call tracing

Browse source 
This is similar to the --ftrace (c function call trace) flag, except
it's less noisy since it only logs system calls to stderr. Having this
flag is valuable because (1) system call tracing tells us a lot about
the behavior of complex programs and (2) it's usually very hard to get
system call tracing on various operating systems, e.g. strace, ktrace,
dtruss, truss, nttrace, etc. Especially on Apple platforms where even
with the special boot trick, debuggers still aren't guaranteed to work.

    make -j8 o//examples
    o//examples/hello.com --strace

This is enabled by default in MODE=, MODE=opt, and MODE=dbg. In MODE=dbg
extra information will be printed.

    make -j8 MODE=dbg o/dbg/examples
    o/dbg/examples/hello.com --strace |& less

This change also changes:

- Rename IsText() → _istext()
- Rename IsUtf8() → _isutf8()
- Fix madvise() on Windows NT
- Fix empty string case of inet_ntop()
- vfork() wrapper now saves and restores errno
- Update xsigaction() to yoink syscall support
This commit is contained in:
Justine Tunney 2022-03-18 18:07:28 -07:00
parent c541225af0
commit 14e192e5ba
138 changed files with 1519 additions and 631 deletions
Download patch file Download diff file Expand all files Collapse all files

18
libc/calls/readlinkat-nt.c
View file

@ -20,7 +20,7 @@
#include "libc/bits/weaken.h"
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/calls/sysdebug.internal.h"
#include "libc/calls/strace.internal.h"
#include "libc/mem/mem.h"
#include "libc/nexgen32e/bsr.h"
#include "libc/nt/createfile.h"
@ -39,7 +39,7 @@
static textwindows ssize_t sys_readlinkat_nt_error(void) {
uint32_t e;
e = GetLastError();
SYSDEBUG("sys_readlinkat_nt() error %d", e);
STRACE("sys_readlinkat_nt() error %d", e);
switch (e) {
case kNtErrorNotAReparsePoint:
return einval();
@ -56,11 +56,11 @@ textwindows ssize_t sys_readlinkat_nt(int dirfd, const char *path, char *buf,
uint64_t w;
wint_t x, y;
void *freeme;
uint32_t e, i, j, n, mem;
uint32_t i, j, n, mem;
char16_t path16[PATH_MAX], *p;
struct NtReparseDataBuffer *rdb;
if (__mkntpathat(dirfd, path, 0, path16) == -1) {
SYSDEBUG("sys_readlinkat_nt() failed b/c __mkntpathat() failed");
STRACE("sys_readlinkat_nt() failed b/c __mkntpathat() failed");
return -1;
}
if (weaken(malloc)) {
@ -72,7 +72,7 @@ textwindows ssize_t sys_readlinkat_nt(int dirfd, const char *path, char *buf,
rdb = (struct NtReparseDataBuffer *)buf;
freeme = 0;
} else {
SYSDEBUG("sys_readlinkat_nt() needs bigger buffer malloc() to be yoinked");
STRACE("sys_readlinkat_nt() needs bigger buffer malloc() to be yoinked");
return enomem();
}
if ((h = CreateFile(path16, 0, 0, 0, kNtOpenExisting,
@ -113,20 +113,20 @@ textwindows ssize_t sys_readlinkat_nt(int dirfd, const char *path, char *buf,
if (freeme || (intptr_t)(buf + j) <= (intptr_t)(p + i)) {
rc = j;
} else {
SYSDEBUG("sys_readlinkat_nt() too many astral codepoints");
STRACE("sys_readlinkat_nt() too many astral codepoints");
rc = enametoolong();
}
} else {
SYSDEBUG("sys_readlinkat_nt() should have kNtIoReparseTagSymlink");
STRACE("sys_readlinkat_nt() should have kNtIoReparseTagSymlink");
rc = einval();
}
} else {
SYSDEBUG("DeviceIoControl(kNtFsctlGetReparsePoint) failed");
STRACE("%s failed %m", "DeviceIoControl(kNtFsctlGetReparsePoint)");
rc = sys_readlinkat_nt_error();
}
CloseHandle(h);
} else {
SYSDEBUG("CreateFile(kNtFileFlagOpenReparsePoint) failed");
STRACE("%s failed %m", "CreateFile(kNtFileFlagOpenReparsePoint)");
rc = sys_readlinkat_nt_error();
}
if (freeme && weaken(free)) {