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| author | Rich Felker <dalias@aerifal.cx> | 2013-04-06 17:50:37 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2013-04-06 17:50:37 -0400 |
| commit | b4ea63856a6af3d1bcc2db12537785371ac2024c (patch) | |
| tree | 689c9acbdd5e5339261988fb4f6ba007eb345d6b | |
| parent | 5c5ac810c31a77dd17b95bb93e13487a3c1c1433 (diff) | |
| download | musl-b4ea63856a6af3d1bcc2db12537785371ac2024c.tar.gz | |
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.
| -rw-r--r-- | include/errno.h | 6 | ||||
| -rw-r--r-- | src/env/__libc_start_main.c | 10 | ||||
| -rw-r--r-- | src/internal/libc.c | 4 |
3 files changed, 18 insertions, 2 deletions
diff --git a/include/errno.h b/include/errno.h index 9e1e3202..0361b33a 100644 --- a/include/errno.h +++ b/include/errno.h @@ -5,6 +5,8 @@ extern "C" { #endif +#include <features.h> + #include <bits/errno.h> #ifdef __GNUC__ @@ -13,6 +15,10 @@ __attribute__((const)) int *__errno_location(void); #define errno (*__errno_location()) +#ifdef _GNU_SOURCE +extern char *program_invocation_short_name, *program_invocation_name; +#endif + #ifdef __cplusplus } #endif 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; diff --git a/src/internal/libc.c b/src/internal/libc.c index d22d2747..942f6b44 100644 --- a/src/internal/libc.c +++ b/src/internal/libc.c @@ -16,3 +16,7 @@ __asm__(".hidden __libc"); size_t __hwcap; size_t __sysinfo; +char *__progname=0, *__progname_full=0; + +weak_alias(__progname, program_invocation_short_name); +weak_alias(__progname_full, program_invocation_name); |