procfs.c

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// SPDX-FileCopyrightText: 2009-2016 pancake <pancake@nopcode.org>
// SPDX-License-Identifier: LGPL-3.0-only
 
#include <rz_userconf.h>
#include <rz_debug.h>
 
int procfs_pid_slurp(int pid, char *prop, char *out, size_t len) {
    int fd, ret = -1;
    ssize_t nr;
 
    char *filename = rz_str_newf("/proc/%d/%s", pid, prop);
    if (!filename) {
        return -1;
    }
    fd = rz_sys_open(filename, O_RDONLY, 0);
    if (fd == -1) {
        free(filename);
        return -1;
    }
    nr = read(fd, out, len);
    out[len - 1] = 0;
    if (nr > 0) {
        out[nr - 1] = '\0'; /* terminate at newline */
        ret = 0;
    } else if (nr < 0) {
        rz_sys_perror("read");
    }
    close(fd);
    free(filename);
    return ret;
}