Some formatting updates (ran the code through indent)
-Erik
This commit is contained in:
Erik Andersen
196
ps.c
196
ps.c
@@ -1,3 +1,4 @@
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/* vi: set sw=4 ts=4: */
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/*
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* Mini ps implementation for busybox
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*
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@@ -33,123 +34,128 @@
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#endif
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typedef struct proc_s {
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char
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cmd[16]; /* basename of executable file in call to exec(2) */
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int
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ruid, rgid, /* real only (sorry) */
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pid, /* process id */
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ppid; /* pid of parent process */
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char
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state; /* single-char code for process state (S=sleeping) */
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char
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cmd[16]; /* basename of executable file in call to exec(2) */
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int
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ruid, rgid, /* real only (sorry) */
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pid, /* process id */
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ppid; /* pid of parent process */
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char
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state; /* single-char code for process state (S=sleeping) */
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} proc_t;
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static int file2str(char *filename, char *ret, int cap)
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static int file2str(char *filename, char *ret, int cap)
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{
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int fd, num_read;
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int fd, num_read;
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if ( (fd = open(filename, O_RDONLY, 0)) == -1 ) return -1;
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if ( (num_read = read(fd, ret, cap - 1)) <= 0 ) return -1;
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ret[num_read] = 0;
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close(fd);
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return num_read;
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if ((fd = open(filename, O_RDONLY, 0)) == -1)
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return -1;
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if ((num_read = read(fd, ret, cap - 1)) <= 0)
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return -1;
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ret[num_read] = 0;
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close(fd);
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return num_read;
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}
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static void parse_proc_status(char* S, proc_t* P)
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static void parse_proc_status(char *S, proc_t * P)
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{
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char* tmp;
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memset(P->cmd, 0, sizeof P->cmd);
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sscanf (S, "Name:\t%15c", P->cmd);
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tmp = strchr(P->cmd,'\n');
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if (tmp)
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*tmp='\0';
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tmp = strstr (S,"State");
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sscanf (tmp, "State:\t%c", &P->state);
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char *tmp;
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tmp = strstr (S,"Pid:");
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if(tmp) sscanf (tmp,
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"Pid:\t%d\n"
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"PPid:\t%d\n",
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&P->pid,
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&P->ppid
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);
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else fprintf(stderr, "Internal error!\n");
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memset(P->cmd, 0, sizeof P->cmd);
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sscanf(S, "Name:\t%15c", P->cmd);
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tmp = strchr(P->cmd, '\n');
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if (tmp)
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*tmp = '\0';
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tmp = strstr(S, "State");
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sscanf(tmp, "State:\t%c", &P->state);
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/* For busybox, ignoring effective, saved, etc */
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tmp = strstr (S,"Uid:");
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if(tmp) sscanf (tmp,
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"Uid:\t%d", &P->ruid);
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else fprintf(stderr, "Internal error!\n");
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tmp = strstr(S, "Pid:");
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if (tmp)
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sscanf(tmp, "Pid:\t%d\n" "PPid:\t%d\n", &P->pid, &P->ppid);
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else
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fprintf(stderr, "Internal error!\n");
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tmp = strstr (S,"Gid:");
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if(tmp) sscanf (tmp,
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"Gid:\t%d", &P->rgid);
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else fprintf(stderr, "Internal error!\n");
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/* For busybox, ignoring effective, saved, etc */
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tmp = strstr(S, "Uid:");
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if (tmp)
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sscanf(tmp, "Uid:\t%d", &P->ruid);
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else
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fprintf(stderr, "Internal error!\n");
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tmp = strstr(S, "Gid:");
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if (tmp)
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sscanf(tmp, "Gid:\t%d", &P->rgid);
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else
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fprintf(stderr, "Internal error!\n");
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}
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extern int ps_main(int argc, char **argv)
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{
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proc_t p;
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DIR *dir;
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FILE *file;
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struct dirent *entry;
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char path[32], sbuf[512];
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char uidName[10]="";
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char groupName[10]="";
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int i, c;
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proc_t p;
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DIR *dir;
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FILE *file;
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struct dirent *entry;
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char path[32], sbuf[512];
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char uidName[10] = "";
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char groupName[10] = "";
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int i, c;
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if ( argc>1 && **(argv+1) == '-' ) {
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usage ("ps\n\nReport process status\n\nThis version of ps accepts no options.\n");
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}
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dir = opendir("/proc");
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if (!dir) {
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perror("Can't open /proc");
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exit(FALSE);
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}
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fprintf(stdout, "%5s %-8s %-3s %5s %s\n", "PID", "Uid", "Gid", "State", "Command");
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while ((entry = readdir(dir)) != NULL) {
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uidName[0]='\0';
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groupName[0]='\0';
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if (! isdigit(*entry->d_name))
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continue;
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sprintf(path, "/proc/%s/status", entry->d_name);
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if ((file2str(path, sbuf, sizeof sbuf)) != -1 ) {
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parse_proc_status(sbuf, &p);
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if (argc > 1 && **(argv + 1) == '-') {
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usage
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("ps\n\nReport process status\n\nThis version of ps accepts no options.\n");
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}
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/* Make some adjustments as needed */
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my_getpwuid( uidName, p.ruid);
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my_getgrgid( groupName, p.rgid);
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if (*uidName == '\0')
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sprintf( uidName, "%d", p.ruid);
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if (*groupName == '\0')
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sprintf( groupName, "%d", p.rgid);
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dir = opendir("/proc");
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if (!dir) {
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perror("Can't open /proc");
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exit(FALSE);
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}
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fprintf(stdout, "%5d %-8s %-8s %c ", p.pid, uidName, groupName, p.state);
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sprintf(path, "/proc/%s/cmdline", entry->d_name);
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file = fopen(path, "r");
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if (file == NULL) {
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perror(path);
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exit(FALSE);
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fprintf(stdout, "%5s %-8s %-3s %5s %s\n", "PID", "Uid", "Gid",
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"State", "Command");
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while ((entry = readdir(dir)) != NULL) {
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uidName[0] = '\0';
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groupName[0] = '\0';
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if (!isdigit(*entry->d_name))
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continue;
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sprintf(path, "/proc/%s/status", entry->d_name);
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if ((file2str(path, sbuf, sizeof sbuf)) != -1) {
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parse_proc_status(sbuf, &p);
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}
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/* Make some adjustments as needed */
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my_getpwuid(uidName, p.ruid);
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my_getgrgid(groupName, p.rgid);
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if (*uidName == '\0')
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sprintf(uidName, "%d", p.ruid);
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if (*groupName == '\0')
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sprintf(groupName, "%d", p.rgid);
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fprintf(stdout, "%5d %-8s %-8s %c ", p.pid, uidName, groupName,
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p.state);
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sprintf(path, "/proc/%s/cmdline", entry->d_name);
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file = fopen(path, "r");
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if (file == NULL) {
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perror(path);
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exit(FALSE);
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}
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i = 0;
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while (((c = getc(file)) != EOF) && (i < 53)) {
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i++;
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if (c == '\0')
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c = ' ';
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putc(c, stdout);
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}
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if (i == 0)
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fprintf(stdout, "%s", p.cmd);
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fprintf(stdout, "\n");
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}
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i=0;
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while (((c = getc(file)) != EOF) && (i < 53)) {
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i++;
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if (c == '\0')
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c = ' ';
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putc(c, stdout);
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}
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if (i==0)
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fprintf(stdout, "%s", p.cmd);
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fprintf(stdout, "\n");
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}
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closedir(dir);
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exit(TRUE);
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closedir(dir);
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exit(TRUE);
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}
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