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authorRich Felker <dalias@aerifal.cx>2013-04-06 17:50:37 -0400
committerRich Felker <dalias@aerifal.cx>2013-04-06 17:50:37 -0400
commitb4ea63856a6af3d1bcc2db12537785371ac2024c (patch)
tree689c9acbdd5e5339261988fb4f6ba007eb345d6b /src/env/__libc_start_main.c
parent5c5ac810c31a77dd17b95bb93e13487a3c1c1433 (diff)
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add support for program_invocation[_short]_name
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.
Diffstat (limited to 'src/env/__libc_start_main.c')
-rw-r--r--src/env/__libc_start_main.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/src/env/__libc_start_main.c b/src/env/__libc_start_main.c
index 04a454e8..aef9f9ec 100644
--- a/src/env/__libc_start_main.c
+++ b/src/env/__libc_start_main.c
@@ -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;