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__init_libc: add fallbacks for __progname setup

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It is possible for argv[0] to be a null pointer, but the __progname
variable is used to implement functions in src/legacy/err.c that do not
expect it to be null. It is also available to the user via the
program_invocation_name alias as a GNU extension, and the implementation
in Glibc initializes it to a pointer to empty string rather than NULL.

Since argv[0] is usually non-null and it's preferable to keep those
variables in BSS, implement the fallbacks in __init_libc, which also
allows to have an intermediate fallback to AT_EXECFN.
This commit is contained in:
Alexander Monakov 2017-07-28 17:46:49 +03:00 committed by Rich Felker
parent cc08669380
commit c7f56b4d2f
1 changed files with 4 additions and 4 deletions
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8
src/env/__libc_start_main.c vendored
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@ -30,10 +30,10 @@ void __init_libc(char **envp, char *pn)
__sysinfo = aux[AT_SYSINFO];
libc.page_size = aux[AT_PAGESZ];
if (pn) {
__progname = __progname_full = pn;
for (i=0; pn[i]; i++) if (pn[i]=='/') __progname = pn+i+1;
}
if (!pn) pn = (void*)aux[AT_EXECFN];
if (!pn) pn = "";
__progname = __progname_full = pn;
for (i=0; pn[i]; i++) if (pn[i]=='/') __progname = pn+i+1;
__init_tls(aux);
__init_ssp((void *)aux[AT_RANDOM]);