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replace /proc scanning code by more versatile one.

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Use it where appropriate.
Stop scanning /etc/passwd *for every process*!!! (uid->username)
top: reduce memory usage - we won't save unneeded fields
from /proc info anymore. Downside: ~+250 bytes of code
This commit is contained in:
Denis Vlasenko
2006-11-05 00:43:51 +00:00
parent fa07680091
commit 459e4d6cf7
6 changed files with 329 additions and 172 deletions
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50
include/libbb.h
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@ -501,23 +501,47 @@ enum { COMM_LEN = 16 };
#endif
#endif
typedef struct {
int pid, ppid;
char user[9];
char state[4];
unsigned long rss;
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
unsigned pcpu;
unsigned long stime, utime;
#endif
DIR *dir;
/* Fields are set to 0/NULL if failed to determine (or not requested) */
char *cmd;
/* basename of executable file in call to exec(2),
size from kernel headers */
char short_cmd[COMM_LEN];
unsigned long rss;
unsigned long stime, utime;
unsigned pid;
unsigned ppid;
unsigned pgid;
unsigned sid;
unsigned uid;
unsigned gid;
/* basename of executable file in call to exec(2), size from */
/* sizeof(task_struct.comm) in /usr/include/linux/sched.h */
char state[4];
char comm[COMM_LEN];
// user/group? - use passwd/group parsing functions
} procps_status_t;
procps_status_t* procps_scan(int save_user_arg0);
enum {
PSSCAN_PID = 1 << 0,
PSSCAN_PPID = 1 << 1,
PSSCAN_PGID = 1 << 2,
PSSCAN_SID = 1 << 3,
PSSCAN_UIDGID = 1 << 4,
PSSCAN_COMM = 1 << 5,
PSSCAN_CMD = 1 << 6,
PSSCAN_STATE = 1 << 7,
PSSCAN_RSS = 1 << 8,
PSSCAN_STIME = 1 << 9,
PSSCAN_UTIME = 1 << 10,
/* These are all retrieved from proc/NN/stat in one go: */
PSSCAN_STAT = PSSCAN_PPID | PSSCAN_PGID | PSSCAN_SID
| PSSCAN_COMM | PSSCAN_STATE
| PSSCAN_RSS | PSSCAN_STIME | PSSCAN_UTIME,
};
procps_status_t* alloc_procps_scan(int flags);
void free_procps_scan(procps_status_t* sp);
procps_status_t* procps_scan(procps_status_t* sp, int flags);
pid_t *find_pid_by_name(const char* procName);
pid_t *pidlist_reverse(pid_t *pidList);
void clear_username_cache(void);
const char* get_cached_username(uid_t uid);
extern const char bb_uuenc_tbl_base64[];