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add support for program_invocation[_short]_name

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this is a bit ugly, and the motivation for supporting it is
questionable. however the main factors were:
1. it will be useful to have this for certain internal purposes
anyway -- things like syslog.
2. applications can just save argv[0] in main, but it's hard to fix
non-portable library code that's depending on being able to get the
invocation name without the main application's help.
This commit is contained in:
Rich Felker
2013-04-06 17:50:37 -04:00
parent 5c5ac810c3
commit b4ea63856a
3 changed files with 18 additions and 2 deletions
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10
src/env/__libc_start_main.c vendored
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@ -8,8 +8,9 @@ void __init_ldso_ctors(void);
#define AUX_CNT 38
extern size_t __hwcap, __sysinfo;
extern char *__progname, *__progname_full;
void __init_libc(char **envp)
void __init_libc(char **envp, char *pn)
{
size_t i, *auxv, aux[AUX_CNT] = { 0 };
__environ = envp;
@ -19,6 +20,11 @@ void __init_libc(char **envp)
__hwcap = aux[AT_HWCAP];
__sysinfo = aux[AT_SYSINFO];
if (pn) {
__progname = __progname_full = pn;
for (i=0; pn[i]; i++) if (pn[i]=='/') __progname = pn+i+1;
}
__init_tls(aux);
__init_security(aux);
}
@ -30,7 +36,7 @@ int __libc_start_main(
{
char **envp = argv+argc+1;
__init_libc(envp);
__init_libc(envp, argv[0]);
libc.ldso_fini = ldso_fini;
libc.fini = fini;