From db528a5d90415ec209aec34b1fa8e76850e7a954 Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Wed, 13 May 2026 22:18:16 +0200 Subject: First commit MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- how-to-update-process.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 how-to-update-process.c (limited to 'how-to-update-process.c') diff --git a/how-to-update-process.c b/how-to-update-process.c new file mode 100644 index 0000000..6328ecf --- /dev/null +++ b/how-to-update-process.c @@ -0,0 +1,42 @@ +#include +#include +#include +#include +#include +#include + + +static const char *text = "Change this text and recompile while the process is running"; + + +int +main(int argc, char *argv[]) +{ + uintptr_t exe_addr = (uintptr_t)getauxval(AT_EXECFN); + const char *exe; + + if (!exe_addr) { + fprintf(stderr, "%s\n", "Sorry, AT_EXECFN not found, would have to use /proc/self/exe, which is out of scope"); + /* by the way, if you just exec into /proc/self/exe + * you restart the process, to the same version as + * running even if it has been replaced (define + * RESTART to try it out) */ + return 1; + } + exe = (void *)exe_addr; /* beware, this might be a relative path */ + + if (argc != 2 || strcmp(argv[1], text)) + printf("%s\n", text); + + unlink(exe); + + for (;;) { + sleep(1); +#ifdef RESTART + execlp("/proc/self/exe", argv[0], text, NULL); + abort(); +#else + execlp(exe, argv[0], text, NULL); +#endif + } +} -- cgit v1.2.3-70-g09d2