diff options
Diffstat (limited to 'ps.c')
| -rw-r--r-- | ps.c | 206 |
1 files changed, 106 insertions, 100 deletions
@@ -1,3 +1,4 @@ +/* vi: set sw=4 ts=4: */ /* * Mini ps implementation for busybox * @@ -33,123 +34,128 @@ #endif typedef struct proc_s { - char - cmd[16]; /* basename of executable file in call to exec(2) */ - int - ruid, rgid, /* real only (sorry) */ - pid, /* process id */ - ppid; /* pid of parent process */ - char - state; /* single-char code for process state (S=sleeping) */ + char + cmd[16]; /* basename of executable file in call to exec(2) */ + int + ruid, rgid, /* real only (sorry) */ + pid, /* process id */ + ppid; /* pid of parent process */ + char + state; /* single-char code for process state (S=sleeping) */ } proc_t; -static int file2str(char *filename, char *ret, int cap) +static int file2str(char *filename, char *ret, int cap) { - int fd, num_read; - - if ( (fd = open(filename, O_RDONLY, 0)) == -1 ) return -1; - if ( (num_read = read(fd, ret, cap - 1)) <= 0 ) return -1; - ret[num_read] = 0; - close(fd); - return num_read; + int fd, num_read; + + if ((fd = open(filename, O_RDONLY, 0)) == -1) + return -1; + if ((num_read = read(fd, ret, cap - 1)) <= 0) + return -1; + ret[num_read] = 0; + close(fd); + return num_read; } -static void parse_proc_status(char* S, proc_t* P) +static void parse_proc_status(char *S, proc_t * P) { - char* tmp; - memset(P->cmd, 0, sizeof P->cmd); - sscanf (S, "Name:\t%15c", P->cmd); - tmp = strchr(P->cmd,'\n'); - if (tmp) - *tmp='\0'; - tmp = strstr (S,"State"); - sscanf (tmp, "State:\t%c", &P->state); - - tmp = strstr (S,"Pid:"); - if(tmp) sscanf (tmp, - "Pid:\t%d\n" - "PPid:\t%d\n", - &P->pid, - &P->ppid - ); - else fprintf(stderr, "Internal error!\n"); - - /* For busybox, ignoring effective, saved, etc */ - tmp = strstr (S,"Uid:"); - if(tmp) sscanf (tmp, - "Uid:\t%d", &P->ruid); - else fprintf(stderr, "Internal error!\n"); - - tmp = strstr (S,"Gid:"); - if(tmp) sscanf (tmp, - "Gid:\t%d", &P->rgid); - else fprintf(stderr, "Internal error!\n"); + char *tmp; + + memset(P->cmd, 0, sizeof P->cmd); + sscanf(S, "Name:\t%15c", P->cmd); + tmp = strchr(P->cmd, '\n'); + if (tmp) + *tmp = '\0'; + tmp = strstr(S, "State"); + sscanf(tmp, "State:\t%c", &P->state); + + tmp = strstr(S, "Pid:"); + if (tmp) + sscanf(tmp, "Pid:\t%d\n" "PPid:\t%d\n", &P->pid, &P->ppid); + else + fprintf(stderr, "Internal error!\n"); + + /* For busybox, ignoring effective, saved, etc */ + tmp = strstr(S, "Uid:"); + if (tmp) + sscanf(tmp, "Uid:\t%d", &P->ruid); + else + fprintf(stderr, "Internal error!\n"); + + tmp = strstr(S, "Gid:"); + if (tmp) + sscanf(tmp, "Gid:\t%d", &P->rgid); + else + fprintf(stderr, "Internal error!\n"); } extern int ps_main(int argc, char **argv) { - proc_t p; - DIR *dir; - FILE *file; - struct dirent *entry; - char path[32], sbuf[512]; - char uidName[10]=""; - char groupName[10]=""; - int i, c; - - if ( argc>1 && **(argv+1) == '-' ) { - usage ("ps\n\nReport process status\n\nThis version of ps accepts no options.\n"); - } - - dir = opendir("/proc"); - if (!dir) { - perror("Can't open /proc"); - exit(FALSE); - } - - fprintf(stdout, "%5s %-8s %-3s %5s %s\n", "PID", "Uid", "Gid", "State", "Command"); - while ((entry = readdir(dir)) != NULL) { - uidName[0]='\0'; - groupName[0]='\0'; - - if (! isdigit(*entry->d_name)) - continue; - sprintf(path, "/proc/%s/status", entry->d_name); - if ((file2str(path, sbuf, sizeof sbuf)) != -1 ) { - parse_proc_status(sbuf, &p); + proc_t p; + DIR *dir; + FILE *file; + struct dirent *entry; + char path[32], sbuf[512]; + char uidName[10] = ""; + char groupName[10] = ""; + int i, c; + + if (argc > 1 && **(argv + 1) == '-') { + usage + ("ps\n\nReport process status\n\nThis version of ps accepts no options.\n"); } - /* Make some adjustments as needed */ - my_getpwuid( uidName, p.ruid); - my_getgrgid( groupName, p.rgid); - if (*uidName == '\0') - sprintf( uidName, "%d", p.ruid); - if (*groupName == '\0') - sprintf( groupName, "%d", p.rgid); - - fprintf(stdout, "%5d %-8s %-8s %c ", p.pid, uidName, groupName, p.state); - sprintf(path, "/proc/%s/cmdline", entry->d_name); - file = fopen(path, "r"); - if (file == NULL) { - perror(path); - exit(FALSE); + dir = opendir("/proc"); + if (!dir) { + perror("Can't open /proc"); + exit(FALSE); } - i=0; - while (((c = getc(file)) != EOF) && (i < 53)) { - i++; - if (c == '\0') - c = ' '; - putc(c, stdout); + + fprintf(stdout, "%5s %-8s %-3s %5s %s\n", "PID", "Uid", "Gid", + "State", "Command"); + while ((entry = readdir(dir)) != NULL) { + uidName[0] = '\0'; + groupName[0] = '\0'; + + if (!isdigit(*entry->d_name)) + continue; + sprintf(path, "/proc/%s/status", entry->d_name); + if ((file2str(path, sbuf, sizeof sbuf)) != -1) { + parse_proc_status(sbuf, &p); + } + + /* Make some adjustments as needed */ + my_getpwuid(uidName, p.ruid); + my_getgrgid(groupName, p.rgid); + if (*uidName == '\0') + sprintf(uidName, "%d", p.ruid); + if (*groupName == '\0') + sprintf(groupName, "%d", p.rgid); + + fprintf(stdout, "%5d %-8s %-8s %c ", p.pid, uidName, groupName, + p.state); + sprintf(path, "/proc/%s/cmdline", entry->d_name); + file = fopen(path, "r"); + if (file == NULL) { + perror(path); + exit(FALSE); + } + i = 0; + while (((c = getc(file)) != EOF) && (i < 53)) { + i++; + if (c == '\0') + c = ' '; + putc(c, stdout); + } + if (i == 0) + fprintf(stdout, "%s", p.cmd); + fprintf(stdout, "\n"); } - if (i==0) - fprintf(stdout, "%s", p.cmd); - fprintf(stdout, "\n"); - } - closedir(dir); - exit(TRUE); + closedir(dir); + exit(TRUE); } |