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use /proc/pid/exe to extract ELF header

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This commit is contained in:
Nikita Smith
2026-01-22 13:59:12 -08:00
parent e907d895c6
commit e724ee8185
1 changed files with 11 additions and 10 deletions
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src/demon/linux/demon_core_linux.c
+11 -10
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@@ -208,18 +208,19 @@ internal ELF_Hdr64
dmn_lnx_ehdr_from_pid(pid_t pid) dmn_lnx_ehdr_from_pid(pid_t pid)
{ {
Temp scratch = scratch_begin(0, 0); Temp scratch = scratch_begin(0, 0);
B32 is_read = 0;
ELF_Hdr64 exe = {0}; ELF_Hdr64 exe = {0};
String8 exe_path = dmn_lnx_exe_path_from_pid(scratch.arena, pid); B32 is_read = 0;
if(exe_path.size != 0)
char *exe_path = (char *)push_str8f(scratch.arena, "/proc/%d/exe", pid).str;
int exe_fd = OS_LNX_RETRY_ON_EINTR(open(exe_path, O_RDONLY));
if(exe_fd >= 0)
{ {
int exe_fd = OS_LNX_RETRY_ON_EINTR(open((char *)exe_path.str, O_RDONLY)); is_read = elf_read_ehdr(dmn_lnx_machine_op_mem_read, &exe_fd, 0, &exe);
if(exe_fd != -1) OS_LNX_RETRY_ON_EINTR(close(exe_fd));
{
is_read = elf_read_ehdr(dmn_lnx_machine_op_mem_read, &exe_fd, 0, &exe);
close(exe_fd);
}
} }
Assert(is_read); Assert(is_read);
scratch_end(scratch); scratch_end(scratch);
return exe; return exe;