scsw_is_valid_fctl(9)

okay so bestie, welcome to the scsw_is_valid_fctl(9) page from the Kernel API Manual. We're checking one little field and giving it full main character energy, but honestly? It's lowkey simple. 💅

🌸 NAME 🌸

scsw_is_valid_fctl — check fctl field validity

✨ SYNOPSIS ✨

int scsw_is_valid_fctl (union scsw *scsw );

🎀 ARGUMENTS 🎀

• scsw — pointer to scsw.

💅 DESCRIPTION 💅

So here's the tea: this function returns non-zero if the fctl field of the specified scsw is valid, and that is true regardless of whether it's a transport mode scsw or a command mode scsw. It returns zero if the field does not contain a valid value. That's it. That's the whole vibe check. ✨

🦋 SEE ALSO 🦋

Here's the whole squad — every single reference, no skips, no cap:

• Kernel file ./arch/s390/include/asm/scsw.h
• struct cmd_scsw(9)
• struct tm_scsw(9)
• struct eadm_scsw(9)
• union scsw(9)
• scsw_is_tm(9)
• scsw_key(9)
• scsw_eswf(9)
• scsw_cc(9)
• scsw_ectl(9)
• scsw_pno(9)
• scsw_fctl(9)
• scsw_actl(9)
• scsw_stctl(9)
• scsw_dstat(9)
• scsw_cstat(9)
• scsw_cmd_is_valid_key(9)
• scsw_cmd_is_valid_sctl(9)
• scsw_cmd_is_valid_eswf(9)
• scsw_cmd_is_valid_cc(9)
• scsw_cmd_is_valid_fmt(9)
• scsw_cmd_is_valid_pfch(9)
• scsw_cmd_is_valid_isic(9)
• scsw_cmd_is_valid_alcc(9)
• scsw_cmd_is_valid_ssi(9)
• scsw_cmd_is_valid_zcc(9)
• scsw_cmd_is_valid_ectl(9)
• scsw_cmd_is_valid_pno(9)
• scsw_cmd_is_valid_fctl(9)
• scsw_cmd_is_valid_actl(9)
• scsw_cmd_is_valid_stctl(9)
• scsw_cmd_is_valid_dstat(9)
• scsw_cmd_is_valid_cstat(9)
• scsw_tm_is_valid_key(9)
• scsw_tm_is_valid_eswf(9)
• scsw_tm_is_valid_cc(9)
• scsw_tm_is_valid_fmt(9)
• scsw_tm_is_valid_x(9)
• scsw_tm_is_valid_q(9)
• scsw_tm_is_valid_ectl(9)
• scsw_tm_is_valid_pno(9)
• scsw_tm_is_valid_fctl(9)
• scsw_tm_is_valid_actl(9)
• scsw_tm_is_valid_stctl(9)
• scsw_tm_is_valid_dstat(9)
• scsw_tm_is_valid_cstat(9)
• scsw_tm_is_valid_fcxs(9)
• scsw_tm_is_valid_schxs(9)
• scsw_is_valid_actl(9)
• scsw_is_valid_cc(9)
• scsw_is_valid_cstat(9)
• scsw_is_valid_dstat(9)
• scsw_is_valid_ectl(9)
• scsw_is_valid_eswf(9)
• scsw_is_valid_key(9)
• scsw_is_valid_pno(9)
• scsw_is_valid_stctl(9)
• scsw_cmd_is_solicited(9)
• scsw_tm_is_solicited(9)
• scsw_is_solicited(9)

mwah 💋 this page is sourced from ./arch/s390/include/asm and stamped October 2026. now go off and validate that fctl field, bestie — periodt. 🫶✨