Control: retitle -1 ltrace: [p]{read,write}[v]() handling, common *64()
functions in modern glibc, [fl]seek[o]()/ftell[o](); requisite [u]llong; 20x
speed optimisation in default config; format %b+bin() lens and %w[f]32x;
splice/c_f_r/sendfile[64] formatting; useful __errno_location
Attaching two patches that turn
splice(3, 0x7ffca660acd8, 1, 0)
= -1
copy_file_range(3, 0x7ffca660acd8, 1, 0)
= -1
sendfile64(1, 3, 0x7ffca660acd8, 0x400000)
= -1
pread64(3 <no return ...>
error: maximum array length seems negative
, "", 65536, -65536)
= -1
__errno_location()
= 0x7f5347bb86c0
__errno_location()
= 0x7f5347bb86c0
strerror(22)
= "Invalid argument"
fprintf(0x7f5347d8e680, "%s: %s: %s\n", "out/cmd/tail", "5M", "Invalid
argument") = 35
close(3)
= 0
__cxa_finalize(0x561787e1efd8)
= <void>
+++ exited (status 1) +++
into
splice(3, -65536, 1, nil, 4194304, 0b101)
= -1
copy_file_range(3, -65536, 1, nil, 4194304, 0)
= -1
sendfile64(1, 3, -65536, 4194304)
= -1
pread64(3 <no return ...>
error: maximum array length seems negative
, "", 65536, -65536)
= -1
__errno_location()
= 22
__errno_location()
= 22
strerror(22)
= "Invalid argument"
fprintf(0x7f2b0401c680, "%s: %s: %s\n", "out/cmd/tail", "5M", "Invalid
argument") = 35
close(3)
= 0
__cxa_finalize(0x55ba48e1cfd8)
= <void>
+++ exited (status 1) +++
From: =?utf-8?b?0L3QsNCx?= <[email protected]> Date: Tue, 1 Aug 2023 17:09:11 +0200 Subject: Add splice()/copy_file_range()/sendfile[64]() Before: splice(3, 0x7ffd4b66f348, 1, 0) = -1 copy_file_range(3, 0x7ffd772bbf28, 1, 0) = -1 sendfile64(1, 3, 0x7ffd772bbf28, 0x400000) = -1 pread64(3 <no return ...> error: maximum array length seems negative , "", 65536, -65536) = -1 After: splice(3, -65536, 1, nil, 4194304, 0b101) = -1 copy_file_range(3, -65536, 1, nil, 4194304, 0) = -1 sendfile64(1, 3, -65536, 4194304) = -1 pread64(3 <no return ...> error: maximum array length seems negative , "", 65536, -65536) = -1 --- etc/ltrace.conf | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/etc/ltrace.conf b/etc/ltrace.conf index 855d373..db914cb 100644 --- a/etc/ltrace.conf +++ b/etc/ltrace.conf @@ -60,6 +60,12 @@ int open(string,hex(int),octal); ; WARNING: 3rd argument may not be there int open64(string,hex(int),octal); ; WARNING: 3rd argument may not be there int openat(openat_fd,string,hex(int),octal); ; WARNING: 4th argument may not be there int openat64(openat_fd,string,hex(int),octal); ; WARNING: 4th argument may not be there +long splice(int,llong*,int,llong*,ulong,bin(uint)) +; unistd.h +long copy_file_range(int,llong*,int,llong*,ulong,bin(uint)) +; sys/sendfile.h +long sendfile(int,int,long*,ulong) +long sendfile64(int,int,llong*,ulong) ; fnmatch.h int fnmatch(string, string, int);
From: =?utf-8?b?0L3QsNCx?= <[email protected]> Date: Tue, 1 Aug 2023 17:30:15 +0200 Subject: __errno_location() returns an int*, not addr This means that before: __errno_location() = 0x7f2707f256c0 __errno_location() = 0x7f2707f256c0 __errno_location() = 0x7f2707f256c0 After: __errno_location() = 0 __errno_location() = 22 __errno_location() = 22 And this __errno_location() is made useful --- etc/ltrace.conf | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/etc/ltrace.conf b/etc/ltrace.conf index db914cb..3d4f5cd 100644 --- a/etc/ltrace.conf +++ b/etc/ltrace.conf @@ -52,7 +52,7 @@ addr dlsym(addr, string); int dlclose(addr); ; errno.h -addr __errno_location(); +int* __errno_location(); ; fcntl.h typedef openat_fd = enum(AT_FDCWD=-100);
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