diff options
Diffstat (limited to 'libc/misc')
| -rw-r--r-- | libc/misc/utmp/utent.c | 86 |
1 files changed, 49 insertions, 37 deletions
diff --git a/libc/misc/utmp/utent.c b/libc/misc/utmp/utent.c index 254040fed..c83f45e73 100644 --- a/libc/misc/utmp/utent.c +++ b/libc/misc/utmp/utent.c @@ -24,14 +24,26 @@ __UCLIBC_MUTEX_STATIC(utmplock, PTHREAD_MUTEX_INITIALIZER); +/* Do not create extra unlocked functions if no locking is needed */ +#if defined __UCLIBC_HAS_THREADS__ +# define static_if_threaded static +#else +# define static_if_threaded /* nothing */ +# define __setutent setutent +# define __getutent getutent +# define __getutid getutid +#endif + + /* Some global crap */ static int static_fd = -1; static struct utmp static_utmp; static const char default_file_name[] = _PATH_UTMP; static const char *static_ut_name = default_file_name; + /* This function must be called with the LOCK held */ -static void __setutent(void) +static_if_threaded void __setutent(void) { if (static_fd < 0) { static_fd = open(static_ut_name, O_RDWR | O_CLOEXEC); @@ -49,20 +61,19 @@ static void __setutent(void) } lseek(static_fd, 0, SEEK_SET); } - +#if defined __UCLIBC_HAS_THREADS__ void setutent(void) { __UCLIBC_MUTEX_LOCK(utmplock); __setutent(); __UCLIBC_MUTEX_UNLOCK(utmplock); } +#endif libc_hidden_def(setutent) /* This function must be called with the LOCK held */ -static struct utmp *__getutent(void) +static_if_threaded struct utmp *__getutent(void) { - struct utmp *ret = NULL; - if (static_fd < 0) { __setutent(); if (static_fd < 0) { @@ -71,11 +82,22 @@ static struct utmp *__getutent(void) } if (read(static_fd, &static_utmp, sizeof(static_utmp)) == sizeof(static_utmp)) { - ret = &static_utmp; + return &static_utmp; } + return NULL; +} +#if defined __UCLIBC_HAS_THREADS__ +struct utmp *getutent(void) +{ + struct utmp *ret; + + __UCLIBC_MUTEX_LOCK(utmplock); + ret = __getutent(); + __UCLIBC_MUTEX_UNLOCK(utmplock); return ret; } +#endif void endutent(void) { @@ -86,43 +108,31 @@ void endutent(void) __UCLIBC_MUTEX_UNLOCK(utmplock); } -struct utmp *getutent(void) -{ - struct utmp *ret; - - __UCLIBC_MUTEX_LOCK(utmplock); - ret = __getutent(); - __UCLIBC_MUTEX_UNLOCK(utmplock); - return ret; -} - /* This function must be called with the LOCK held */ -static struct utmp *__getutid(const struct utmp *utmp_entry) +static_if_threaded struct utmp *__getutid(const struct utmp *utmp_entry) { struct utmp *lutmp; + unsigned type; + + /* We use the fact that constants we are interested in are: */ + /* RUN_LVL=1, ... OLD_TIME=4; INIT_PROCESS=5, ... USER_PROCESS=8 */ + type = utmp_entry->ut_type - 1; + type /= 4; while ((lutmp = __getutent()) != NULL) { - if ( (utmp_entry->ut_type == RUN_LVL || - utmp_entry->ut_type == BOOT_TIME || - utmp_entry->ut_type == NEW_TIME || - utmp_entry->ut_type == OLD_TIME) && - lutmp->ut_type == utmp_entry->ut_type) - { - return lutmp; - } - if ( (utmp_entry->ut_type == INIT_PROCESS || - utmp_entry->ut_type == DEAD_PROCESS || - utmp_entry->ut_type == LOGIN_PROCESS || - utmp_entry->ut_type == USER_PROCESS) && - !strncmp(lutmp->ut_id, utmp_entry->ut_id, sizeof(lutmp->ut_id))) - { - return lutmp; - } + if (type == 0 && lutmp->ut_type == utmp_entry->ut_type) { + /* one of RUN_LVL, BOOT_TIME, NEW_TIME, OLD_TIME */ + return lutmp; + } + if (type == 1 && strncmp(lutmp->ut_id, utmp_entry->ut_id, sizeof(lutmp->ut_id)) == 0) { + /* INIT_PROCESS, LOGIN_PROCESS, USER_PROCESS, DEAD_PROCESS */ + return lutmp; + } } return NULL; } - +#if defined __UCLIBC_HAS_THREADS__ struct utmp *getutid(const struct utmp *utmp_entry) { struct utmp *ret; @@ -132,6 +142,7 @@ struct utmp *getutid(const struct utmp *utmp_entry) __UCLIBC_MUTEX_UNLOCK(utmplock); return ret; } +#endif struct utmp *getutline(const struct utmp *utmp_entry) { @@ -139,9 +150,10 @@ struct utmp *getutline(const struct utmp *utmp_entry) __UCLIBC_MUTEX_LOCK(utmplock); while ((lutmp = __getutent()) != NULL) { - if ((lutmp->ut_type == USER_PROCESS || lutmp->ut_type == LOGIN_PROCESS) && - !strcmp(lutmp->ut_line, utmp_entry->ut_line)) { - break; + if (lutmp->ut_type == USER_PROCESS || lutmp->ut_type == LOGIN_PROCESS) { + if (strncmp(lutmp->ut_line, utmp_entry->ut_line, sizeof(lutmp->ut_line)) == 0) { + break; + } } } __UCLIBC_MUTEX_UNLOCK(utmplock); |