* Gordon Messmer:
> On 2026-09-07 5:20 AM, Florian Weimer wrote:
>> 000000000001e740 <putenv>:
>> - 1e740: f3 0f 1e fa endbr64
>> + 1e740: cc int3
>> + 1e741: 0f 1e fa nop %edx
>> 1e744: 55 push %rbp
>> 1e745: be 3d 00 00 00 mov $0x3d,%esi
>> 1e74a: 48 89 e5 mov %rsp,%rbp
>
>
> Before I do any work on a new CI test: How did you generate this diff?
I used the program below to dum /usr/lib64/libc.so.6, and then ran
objdump -d --reloc.
Thanks,
Florian
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
struct mapped
{
void *buffer;
size_t length;
};
static bool
open_mmap (const char *file, int flags, struct mapped *result)
{
int fd = open (file, O_RDONLY);
if (fd < 0)
return false;
struct statx st;
if (statx (fd, "", AT_EMPTY_PATH, STATX_SIZE, &st) != 0)
{
close (fd);
return false;
}
void *ptr;
if (st.stx_size == 0)
ptr = NULL;
else
ptr = mmap (NULL, st.stx_size, PROT_READ, MAP_FILE | flags, fd, 0);
close (fd);
if (ptr == MAP_FAILED)
return false;
result->buffer = ptr;
result->length = st.stx_size;
return true;
}
static void
open_mmap_unmap (struct mapped *result)
{
if (result->length > 0)
{
munmap (result->buffer, result->length);
result->buffer = NULL;
result->length = 0;
}
}
int
main (int argc, char **argv)
{
for (int i = 1; i < argc; ++i)
{
struct mapped mprivate = {NULL, 0};
if (open_mmap (argv[i], MAP_PRIVATE, &mprivate))
{
void *p = mprivate.buffer;
void *end = p + mprivate.length;
while (p != end)
{
ssize_t count = write (STDOUT_FILENO, p, end - p);
if (count == 0)
{
errno = ENOSPC;
count = -1;
}
if (count < 0)
err (1, "write");
p += count;
}
}
open_mmap_unmap (&mprivate);
}
}
--
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