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commit 7f91ce265ea456b3096ccba7fdbb890bcf00e225
parent ceb13206a4d9f410ab49c3824c487658c341d8c8
Author: Laslo Hunhold <dev@frign.de>
Date:   Mon, 21 May 2018 23:03:34 +0200

swap.c: Refactor getstats() and its usage

Add a return value so we are able to check any errors and actually fail
when there has been a critical error instead of carrying on uselessly.

Diffstat:
Mcomponents/swap.c | 36++++++++++++++++++++++--------------
1 file changed, 22 insertions(+), 14 deletions(-)

diff --git a/components/swap.c b/components/swap.c @@ -135,29 +135,27 @@ #include <sys/types.h> #include <unistd.h> - static void + static int getstats(int *total, int *used) { struct swapent *sep, *fsep; int rnswap, nswap, i; - nswap = swapctl(SWAP_NSWAP, 0, 0); - if (nswap < 1) { + if ((nswap = swapctl(SWAP_NSWAP, 0, 0)) < 1) { warn("swaptctl 'SWAP_NSWAP':"); + return 1; } - - fsep = sep = calloc(nswap, sizeof(*sep)); - if (!sep) { + if (!(fsep = sep = calloc(nswap, sizeof(*sep)))) { warn("calloc 'nswap':"); + return 1; } - - rnswap = swapctl(SWAP_STATS, (void *)sep, nswap); - if (rnswap < 0) { + if ((rnswap = swapctl(SWAP_STATS, (void *)sep, nswap)) < 0) { warn("swapctl 'SWAP_STATA':"); + return 1; } - if (nswap != rnswap) { warn("getstats: SWAP_STATS != SWAP_NSWAP"); + return 1; } *total = 0; @@ -169,6 +167,8 @@ } free(fsep); + + return 0; } const char * @@ -176,7 +176,9 @@ { int total, used; - getstats(&total, &used); + if (getstats(&total, &used)) { + return NULL; + } return fmt_human((total - used) * 1024, 1024); } @@ -186,7 +188,9 @@ { int total, used; - getstats(&total, &used); + if (getstats(&total, &used)) { + return NULL; + } if (total == 0) { return NULL; @@ -200,7 +204,9 @@ { int total, used; - getstats(&total, &used); + if (getstats(&total, &used)) { + return NULL; + } return fmt_human(total * 1024, 1024); } @@ -210,7 +216,9 @@ { int total, used; - getstats(&total, &used); + if (getstats(&total, &used)) { + return NULL; + } return fmt_human(used * 1024, 1024); }