They are defined into readproc.h too (search for '#define PROC_FILLMEM'). The OPTIONS you can use in the openproc() call are bitwise-or flags, so you can use one or more of then, as : PROCTAB *proctab = openproc(PROC_FILLMEM | PROC_FILLCOM) If you downloaded the sources, proc_t struct is defined into readproc.h Procinfo will hold all info for a process(like utime, stime, priority, nice, ppid, etc) already in numeric format. While(readproc(proctab, &procinfo) != nullptr) Using libprocps.so gives advantages (for example, freeing you of coding a bunch of "parsing" functions) and disadvantages (maybe you want less info than gathered by readproc() calls).Ī program using libprocps.so has this basic format. (B) reading info of process (calling readproc() for each one) Open("/proc/sys/kernel/pid_max", O_RDONLY) = 4 Open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3 Open("/sys/devices/system/cpu/online", O_RDONLY|O_CLOEXEC) = 3 Brctl command can be used to set up, maintain, and inspect the Ethernet. Open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3 Similar to the -s option, only this time the address info is taken from file. You can find this out by yourself by observing what the ps command does with strace, a command that lists the system calls made by a process. 1 Answer Sorted by: 31 -e and -f are options to the ps command, and pipes take the output of one command and pass it as the input to another. You can find documentation about the entries in /proc in the proc(5) man page and in the kernel documentation. E.g., ps -ef -forest ps -u josue -forest shows parent/child relationships for. The content of these files is generated on the fly by the kernel when a process reads them. You can use the tab key to complete a partially-typed command.The content of these files is generated on the fly by the kernel when a process reads them. The directory /proc/ PID contains various files that provide information about process PID. The directory /proc/ PID contains various files that provide information about process PID. 103 1 1 6 Add a comment 3 Answers Sorted by: 9 On Linux, the ps command works by reading files in the proc filesystem. On Linux, the ps command works by reading files in the proc filesystem.
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